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<head><title>Descriptor data structure</title>
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</head><body
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>
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<!--l. 48--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlsu9.html" >next</a>] [<a
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href="#tailuserhtmlsu5.html">tail</a>] [<a
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href="userhtmlsu7.html#userhtmlsu8.html" >up</a>] </p></div>
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<h4 class="subsectionHead"><span class="titlemark">3.1 </span> <a
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id="x13-100003.1"></a>Descriptor data structure</h4>
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<!--l. 50--><p class="noindent" >All the general matrix informations and elements to be exchanged among processes
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are stored within a data structure of the type <a
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id="descdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_desc</span><span
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class="cmtt-10">_type</span></a>. Every structure of this
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type is associated with a discretization pattern and enables data communications and
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other operations that are necessary for implementing the various algorithms of
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interest to us.
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<!--l. 57--><p class="indent" > The data structure itself <span class="lstinline"></span><span
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class="cmtt-10">psb_desc_type</span> can be treated as an opaque object
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handled via the tools routines of Sec. <a
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href="userhtmlse6.html#x40-770006">6<!--tex4ht:ref: sec:toolsrout --></a> or the query routines detailed below;
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nevertheless we include here a description for the curious reader.
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<!--l. 63--><p class="indent" > First we describe the <span class="lstinline"></span><span
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class="cmtt-10">psb_indx_map</span> type. This is a data structure that keeps
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track of a certain number of basic issues such as:
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<ul class="itemize1">
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<li class="itemize">The value of the communication context;
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</li>
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<li class="itemize">The number of indices in the index space, i.e. global number of rows and
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columns of a sparse matrix;
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</li>
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<li class="itemize">The local set of indices, including:
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<ul class="itemize2">
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<li class="itemize">The number of local indices (and local rows);
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</li>
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<li class="itemize">The number of halo indices (and therefore local columns);
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</li>
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<li class="itemize">The global indices corresponding to the local ones.</li></ul>
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</li></ul>
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<!--l. 77--><p class="noindent" >There are many different schemes for storing these data; therefore there are a number of
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types extending the base one, and the descriptor structure holds a polymorphic
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object whose dynamic type can be any of the extended types. The methods
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associated with this data type answer the following queries:
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<ul class="itemize1">
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<li class="itemize">For a given set of local indices, find the corresponding indices in the global
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numbering;
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</li>
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<li class="itemize">For a given set of global indices, find the corresponding indices in the local
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numbering, if any, or return an invalid
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</li>
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<li class="itemize">Add a global index to the set of halo indices;
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</li>
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<li class="itemize">Find the process owner of each member of a set of global indices.</li></ul>
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<!--l. 92--><p class="noindent" >All methods but the last are purely local; the last method potentially requires
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communication among processes, and thus is a synchronous method. The
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choice of a specific dynamic type for the index map is made at the time the
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descriptor is initially allocated, according to the mode of initialization (see
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also <a
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href="userhtmlse6.html#x40-770006">6<!--tex4ht:ref: sec:toolsrout --></a>).
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<!--l. 98--><p class="indent" > The descriptor contents are as follows:
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">indxmap</span> </dt><dd
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class="description">A polymorphic variable of a type that is any extension of the
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indx_map type described above. <br
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class="newline" />
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</dd><dt class="description">
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<span
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class="cmbx-10">halo</span><span
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class="cmbx-10">_index</span> </dt><dd
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class="description">A list of the halo and boundary elements for the current process to be
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exchanged with other processes; for each processes with which it is necessary to
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communicate:
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<ol class="enumerate1" >
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<li
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class="enumerate" id="x13-10002x1">Process identifier;
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</li>
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<li
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class="enumerate" id="x13-10004x2">Number of points to be received;
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</li>
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<li
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class="enumerate" id="x13-10006x3">Indices of points to be received;
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</li>
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<li
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class="enumerate" id="x13-10008x4">Number of points to be sent;
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</li>
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<li
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class="enumerate" id="x13-10010x5">Indices of points to be sent;</li></ol>
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<!--l. 114--><p class="noindent" >Specified as: a vector of integer type, see <a
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href="userhtmlsu7.html#x15-460003.3">3.3<!--tex4ht:ref: sec:vecttype --></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">ext</span><span
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class="cmbx-10">_index</span> </dt><dd
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class="description">A list of element indices to be exchanged to implement the mapping
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between a base descriptor and a descriptor with overlap. <br
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class="newline" />Specified as: a vector of integer type, see <a
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href="userhtmlsu7.html#x15-460003.3">3.3<!--tex4ht:ref: sec:vecttype --></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">ovrlap</span><span
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class="cmbx-10">_index</span> </dt><dd
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class="description">A list of the overlap elements for the current process, organized in
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groups like the previous vector:
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<ol class="enumerate1" >
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<li
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class="enumerate" id="x13-10012x1">Process identifier;
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</li>
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<li
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class="enumerate" id="x13-10014x2">Number of points to be received;
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</li>
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<li
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class="enumerate" id="x13-10016x3">Indices of points to be received;
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</li>
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<li
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class="enumerate" id="x13-10018x4">Number of points to be sent;
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</li>
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<li
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class="enumerate" id="x13-10020x5">Indices of points to be sent;</li></ol>
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<!--l. 130--><p class="noindent" >Specified as: a vector of integer type, see <a
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href="userhtmlsu7.html#x15-460003.3">3.3<!--tex4ht:ref: sec:vecttype --></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">ovr</span><span
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class="cmbx-10">_mst</span><span
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class="cmbx-10">_idx</span> </dt><dd
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class="description">A list to retrieve the value of each overlap element from the respective
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master process.<br
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class="newline" />Specified as: a vector of integer type, see <a
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href="userhtmlsu7.html#x15-460003.3">3.3<!--tex4ht:ref: sec:vecttype --></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">ovrlap</span><span
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class="cmbx-10">_elem</span> </dt><dd
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class="description">For all overlap points belonging to th ecurrent process:
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<ol class="enumerate1" >
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<li
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class="enumerate" id="x13-10022x1">Overlap point index;
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</li>
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<li
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class="enumerate" id="x13-10024x2">Number of processes sharing that overlap points;
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</li>
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<li
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class="enumerate" id="x13-10026x3">Index of a “master” process:</li></ol>
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<!--l. 141--><p class="noindent" >Specified as: an allocatable integer array of rank two.
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</dd><dt class="description">
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<span
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class="cmbx-10">bnd</span><span
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class="cmbx-10">_elem</span> </dt><dd
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class="description">A list of all boundary points, i.e. points that have a connection with
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other processes.</dd></dl>
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<!--l. 145--><p class="noindent" >The Fortran 2003 declaration for <span class="lstinline"></span><span
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class="cmtt-10">psb_desc_type</span> structures is as follows:
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<!--l. 147--><p class="indent" > <a
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id="x13-10027r1"></a><hr class="float"><div class="float"
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>
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<div class="center"
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>
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<!--l. 162--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-1">
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type psb_desc_type
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 <br />    class(psb_indx_map), allocatable :: indxmap
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 <br />    type(psb_i_vect_type) :: v_halo_index
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 <br />    type(psb_i_vect_type) :: v_ext_index
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 <br />    type(psb_i_vect_type) :: v_ovrlap_index
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 <br />    type(psb_i_vect_type) :: v_ovr_mst_idx
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 <br />    integer, allocatable  :: ovrlap_elem(:,:)
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 <br />    integer, allocatable  :: bnd_elem(:)
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 <br />end type psb_desc_type
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</div>
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<!--l. 174--><p class="nopar" ></div></div>
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<br /> <div class="caption"
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><span class="id">Listing 1: </span><span
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class="content">The PSBLAS defined data type that contains the communication
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descriptor.</span></div><!--tex4ht:label?: x13-10027r1 -->
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</div><hr class="endfloat" />
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<!--l. 186--><p class="indent" > A communication descriptor associated with a sparse matrix has a state, which
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can take the following values:
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Build:</span> </dt><dd
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class="description">State entered after the first allocation, and before the first assembly; in
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this state it is possible to add communication requirements among different
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processes.
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</dd><dt class="description">
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<span
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class="cmbx-10">Assembled:</span> </dt><dd
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class="description">State entered after the assembly; computations using the
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associated sparse matrix, such as matrix-vector products, are only possible
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in this state.</dd></dl>
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<h5 class="subsubsectionHead"><span class="titlemark">3.1.1 </span> <a
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id="x13-110003.1.1"></a>Descriptor Methods</h5>
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<!--l. 199--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.1.2 </span> <a
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id="x13-120003.1.2"></a>get_local_rows — Get number of local rows</h5>
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<div class="verbatim" id="verbatim-2">
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nr = desc%get_local_rows()
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</div>
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<!--l. 203--><p class="nopar" >
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<!--l. 205--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">desc</span> </dt><dd
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class="description">the communication descriptor.<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span>.<br
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class="newline" /></dd></dl>
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<!--l. 215--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">Function value</span> </dt><dd
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class="description">The number of local rows, i.e. the number of rows owned by
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the current process; as explained in <a
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href="userhtmlse1.html#x3-20001">1<!--tex4ht:ref: sec:intro --></a>, it is equal to <span
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class="cmsy-10">|<img
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src="cmsy10-49.png" alt="I" class="10x-x-49" /></span><sub><span
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class="cmmi-7">i</span></sub><span
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class="cmsy-10">|</span>+<span
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class="cmsy-10">|<img
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src="cmsy10-42.png" alt="B" class="10x-x-42" /></span><sub><span
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class="cmmi-7">i</span></sub><span
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class="cmsy-10">|</span>. The returned
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value is specific to the calling process.</dd></dl>
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<!--l. 224--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.1.3 </span> <a
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id="x13-130003.1.3"></a>get_local_cols — Get number of local cols</h5>
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<div class="verbatim" id="verbatim-3">
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nc = desc%get_local_cols()
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</div>
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<!--l. 228--><p class="nopar" >
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<!--l. 230--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" /></dd></dl>
|
|
|
|
|
<!--l. 240--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The number of local cols, i.e. the number of indices used by
|
|
|
|
|
the current process, including both local and halo indices; as explained
|
|
|
|
|
in <a
|
|
|
|
|
href="userhtmlse1.html#x3-20001">1<!--tex4ht:ref: sec:intro --></a>, it is equal to <span
|
|
|
|
|
class="cmsy-10">|<img
|
|
|
|
|
src="cmsy10-49.png" alt="I" class="10x-x-49" /></span><sub><span
|
|
|
|
|
class="cmmi-7">i</span></sub><span
|
|
|
|
|
class="cmsy-10">| </span>+ <span
|
|
|
|
|
class="cmsy-10">|<img
|
|
|
|
|
src="cmsy10-42.png" alt="B" class="10x-x-42" /></span><sub><span
|
|
|
|
|
class="cmmi-7">i</span></sub><span
|
|
|
|
|
class="cmsy-10">| </span>+ <span
|
|
|
|
|
class="cmsy-10">|<img
|
|
|
|
|
src="cmsy10-48.png" alt="H" class="10x-x-48" /></span><sub><span
|
|
|
|
|
class="cmmi-7">i</span></sub><span
|
|
|
|
|
class="cmsy-10">|</span>. The returned value is specific to the
|
|
|
|
|
calling process.</dd></dl>
|
|
|
|
|
<!--l. 250--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.4 </span> <a
|
|
|
|
|
id="x13-140003.1.4"></a>get_global_rows — Get number of global rows</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-4">
|
|
|
|
|
nr = desc%get_global_rows()
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 254--><p class="nopar" >
|
|
|
|
|
<!--l. 256--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" /></dd></dl>
|
|
|
|
|
<!--l. 266--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The number of global rows, i.e. the size of the global index
|
|
|
|
|
space.</dd></dl>
|
|
|
|
|
<!--l. 272--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.5 </span> <a
|
|
|
|
|
id="x13-150003.1.5"></a>get_global_cols — Get number of global cols</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-5">
|
|
|
|
|
nr = desc%get_global_cols()
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 276--><p class="nopar" >
|
|
|
|
|
<!--l. 278--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" /></dd></dl>
|
|
|
|
|
<!--l. 288--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The number of global cols; usually this is equal to the number
|
|
|
|
|
of global rows.</dd></dl>
|
|
|
|
|
<!--l. 295--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.6 </span> <a
|
|
|
|
|
id="x13-160003.1.6"></a>get_global_indices — Get vector of global indices</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-6">
|
|
|
|
|
myidx = desc%get_global_indices([owned])
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 299--><p class="nopar" >
|
|
|
|
|
<!--l. 301--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />Type: <span
|
|
|
|
|
class="cmbx-10">required</span>.<br
|
|
|
|
|
class="newline" />
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">owned</span> </dt><dd
|
|
|
|
|
class="description">Choose if you only want owned indices (<span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">owned</span><span
|
|
|
|
|
class="cmtt-10">=.</span><span
|
|
|
|
|
class="cmtt-10">true</span><span
|
|
|
|
|
class="cmtt-10">.</span>) or also halo
|
|
|
|
|
indices (<span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">owned</span><span
|
|
|
|
|
class="cmtt-10">=.</span><span
|
|
|
|
|
class="cmtt-10">false</span><span
|
|
|
|
|
class="cmtt-10">.</span>). Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />Type: <span
|
|
|
|
|
class="cmbx-10">optional</span>; default: <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">.</span><span
|
|
|
|
|
class="cmtt-10">true</span><span
|
|
|
|
|
class="cmtt-10">.</span>.<br
|
|
|
|
|
class="newline" /></dd></dl>
|
|
|
|
|
<!--l. 315--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The global indices, returned as an allocatable integer array of
|
|
|
|
|
kind <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_lpk_</span> and rank 1.</dd></dl>
|
|
|
|
|
<!--l. 323--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.7 </span> <a
|
|
|
|
|
id="x13-170003.1.7"></a>get_context — Get communication context</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-7">
|
|
|
|
|
ctxt = desc%get_context()
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 327--><p class="nopar" >
|
|
|
|
|
<!--l. 329--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" /></dd></dl>
|
|
|
|
|
<!--l. 339--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The communication context.</dd></dl>
|
|
|
|
|
<!--l. 344--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.8 </span> <a
|
|
|
|
|
id="x13-180003.1.8"></a>Clone — clone current object</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-8">
|
|
|
|
|
call  desc%clone(descout,info)
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 348--><p class="nopar" >
|
|
|
|
|
<!--l. 350--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" /></dd></dl>
|
|
|
|
|
<!--l. 360--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">descout</span> </dt><dd
|
|
|
|
|
class="description">A copy of the input object.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">info</span> </dt><dd
|
|
|
|
|
class="description">Return code.</dd></dl>
|
|
|
|
|
<!--l. 367--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.9 </span> <a
|
|
|
|
|
id="x13-190003.1.9"></a>CNV — convert internal storage format</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-9">
|
|
|
|
|
call  desc%cnv(mold)
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 371--><p class="nopar" >
|
|
|
|
|
<!--l. 373--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">desc</span> </dt><dd
|
|
|
|
|
class="description">the communication descriptor.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">mold</span> </dt><dd
|
|
|
|
|
class="description">the desired integer storage format.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />Specified as: a object of type derived from (integer)
|
|
|
|
|
<a
|
|
|
|
|
id="vbasedata"><span
|
|
|
|
|
class="cmtt-10">psb</span><span
|
|
|
|
|
class="cmtt-10">_T</span><span
|
|
|
|
|
class="cmtt-10">_base</span><span
|
|
|
|
|
class="cmtt-10">_vect</span><span
|
|
|
|
|
class="cmtt-10">_type</span></a>.</dd></dl>
|
|
|
|
|
<!--l. 384--><p class="noindent" >The <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">mold</span> arguments may be employed to interface with special devices, such as GPUs
|
|
|
|
|
and other accelerators.
|
|
|
|
|
<!--l. 391--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.10 </span> <a
|
|
|
|
|
id="x13-200003.1.10"></a>psb_cd_get_large_threshold — Get threshold for index mapping
|
|
|
|
|
switch</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-10">
|
|
|
|
|
ith = psb_cd_get_large_threshold()
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 395--><p class="nopar" >
|
|
|
|
|
<!--l. 397--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
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|
|
class="description">Asynchronous.
|
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|
|
|
</dd><dt class="description">
|
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|
<span
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|
class="cmbx-10">On Return</span> </dt><dd
|
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|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
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|
<span
|
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|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The current value for the size threshold.
|
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|
</dd></dl>
|
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|
<!--l. 407--><p class="noindent" >
|
|
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|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.11 </span> <a
|
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|
|
id="x13-210003.1.11"></a>psb_cd_set_large_threshold — Set threshold for index mapping
|
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|
switch</h5>
|
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|
<div class="verbatim" id="verbatim-11">
|
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|
call psb_cd_set_large_threshold(ith)
|
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|
</div>
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|
<!--l. 412--><p class="nopar" >
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<!--l. 414--><p class="indent" >
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|
<dl class="description"><dt class="description">
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|
<span
|
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|
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|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Synchronous.
|
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|
|
</dd><dt class="description">
|
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|
<span
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|
class="cmbx-10">On Entry</span> </dt><dd
|
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|
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|
class="description">
|
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|
</dd><dt class="description">
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|
<span
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|
class="cmbx-10">ith</span> </dt><dd
|
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|
class="description">the new threshold for communication descriptors.<br
|
|
|
|
|
class="newline" />Scope: <span
|
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|
|
|
class="cmbx-10">global</span>.<br
|
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|
|
class="newline" />Type: <span
|
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|
|
class="cmbx-10">required</span>.<br
|
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|
|
class="newline" />Intent: <span
|
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|
|
class="cmbx-10">in</span>.<br
|
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|
|
class="newline" />Specified as: an integer value greater than zero.</dd></dl>
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|
<!--l. 423--><p class="noindent" >Note: the threshold value is only queried by the library at the time a call to <span class="lstinline"></span><span
|
|
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|
|
class="cmtt-10">psb_cdall</span>
|
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|
|
|
is executed, therefore changing the threshold has no effect on communication
|
|
|
|
|
descriptors that have already been initialized. Moreover the threshold must have the
|
|
|
|
|
same value on all processes.
|
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|
<!--l. 430--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.12 </span> <a
|
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|
|
id="x13-220003.1.12"></a>get_p_adjcncy — Get process adjacency list</h5>
|
|
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|
|
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|
|
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|
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|
|
<div class="verbatim" id="verbatim-12">
|
|
|
|
|
list =  desc%get_p_adjcncy()
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 435--><p class="nopar" >
|
|
|
|
|
<!--l. 437--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Function value</span> </dt><dd
|
|
|
|
|
class="description">The current list of adjacent processes, i.e. processes with
|
|
|
|
|
which the current one has to exchange halo data.
|
|
|
|
|
</dd></dl>
|
|
|
|
|
<!--l. 446--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.13 </span> <a
|
|
|
|
|
id="x13-230003.1.13"></a>set_p_adjcncy — Set process adjacency list</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-13">
|
|
|
|
|
call desc%set_p_adjcncy(list)
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 451--><p class="nopar" >
|
|
|
|
|
<!--l. 453--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Asynchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">list</span> </dt><dd
|
|
|
|
|
class="description">the list of adjacent processes.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />Type: <span
|
|
|
|
|
class="cmbx-10">required</span>.<br
|
|
|
|
|
class="newline" />Intent: <span
|
|
|
|
|
class="cmbx-10">in</span>.<br
|
|
|
|
|
class="newline" />Specified as: a one-dimensional array of integers of kind <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_ipk_</span>.</dd></dl>
|
|
|
|
|
<!--l. 462--><p class="noindent" >Note: this method can be called after a call to <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_cdall</span> and before a call to
|
|
|
|
|
<span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_cdasb</span>. The user is specifying here some knowledge about which processes are
|
|
|
|
|
topological neighbours of the current process. The availability of this information
|
|
|
|
|
may speed up the execution of the assembly call <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_cdasb</span>.
|
|
|
|
|
<!--l. 469--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.14 </span> <a
|
|
|
|
|
id="x13-240003.1.14"></a>fnd_owner — Find the owner process of a set of indices</h5>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="verbatim" id="verbatim-14">
|
|
|
|
|
call desc%fnd_owner(idx,iprc,info)
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 474--><p class="nopar" >
|
|
|
|
|
<!--l. 476--><p class="indent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">Type:</span> </dt><dd
|
|
|
|
|
class="description">Synchronous.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Entry</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">idx</span> </dt><dd
|
|
|
|
|
class="description">the list of global indices for which we need the owning processes.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />Type: <span
|
|
|
|
|
class="cmbx-10">required</span>.<br
|
|
|
|
|
class="newline" />Intent: <span
|
|
|
|
|
class="cmbx-10">in</span>.<br
|
|
|
|
|
class="newline" />Specified as: a one-dimensional array of integers of kind <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_lpk_</span>.
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">On Return</span> </dt><dd
|
|
|
|
|
class="description">
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">iprc</span> </dt><dd
|
|
|
|
|
class="description">the list of processes owning the indices in <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">idx</span>.<br
|
|
|
|
|
class="newline" />Scope: <span
|
|
|
|
|
class="cmbx-10">local</span>.<br
|
|
|
|
|
class="newline" />Type: <span
|
|
|
|
|
class="cmbx-10">required</span>.<br
|
|
|
|
|
class="newline" />Intent: <span
|
|
|
|
|
class="cmbx-10">in</span>.<br
|
|
|
|
|
class="newline" />Specified as: an allocatable one-dimensional array of integers of kind
|
|
|
|
|
<span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">psb_ipk_</span>.</dd></dl>
|
|
|
|
|
<!--l. 491--><p class="noindent" >Note: this method may or may not actually require communications, depending on the
|
|
|
|
|
exact internal data storage; given that the choice of storage may be altered by
|
|
|
|
|
runtime parameters, it is necessary for safety that this method is called by all
|
|
|
|
|
processes.
|
|
|
|
|
<!--l. 499--><p class="noindent" >
|
|
|
|
|
<h5 class="subsubsectionHead"><span class="titlemark">3.1.15 </span> <a
|
|
|
|
|
id="x13-250003.1.15"></a>Named Constants</h5>
|
|
|
|
|
<!--l. 501--><p class="noindent" >
|
|
|
|
|
<dl class="description"><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_none</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Generic no-op;
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_root</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Default root process for broadcast and scatter operations;
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_nohalo</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Do not fetch halo elements;
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_halo</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Fetch halo elements from neighbouring processes;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_sum</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Sum overlapped elements
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_avg</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Average overlapped elements
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_comm</span><span
|
|
|
|
|
class="cmbx-10">_halo</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Exchange data based on the <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">halo_index</span> list;
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_comm</span><span
|
|
|
|
|
class="cmbx-10">_ext</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Exchange data based on the <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">ext_index</span> list;
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_comm</span><span
|
|
|
|
|
class="cmbx-10">_ovr</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Exchange data based on the <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">ovrlap_index</span> list;
|
|
|
|
|
</dd><dt class="description">
|
|
|
|
|
<span
|
|
|
|
|
class="cmbx-10">psb</span><span
|
|
|
|
|
class="cmbx-10">_comm</span><span
|
|
|
|
|
class="cmbx-10">_mov</span><span
|
|
|
|
|
class="cmbx-10">_</span> </dt><dd
|
|
|
|
|
class="description">Exchange data based on the <span class="lstinline"></span><span
|
|
|
|
|
class="cmtt-10">ovr_mst_idx</span> list;
|
|
|
|
|
</dd></dl>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!--l. 534--><div class="crosslinks"><p class="noindent">[<a
|
|
|
|
|
href="userhtmlsu9.html" >next</a>] [<a
|
|
|
|
|
href="userhtmlsu5.html" >front</a>] [<a
|
|
|
|
|
href="userhtmlsu7.html#userhtmlsu8.html" >up</a>] </p></div>
|
|
|
|
|
<!--l. 534--><p class="indent" > <a
|
|
|
|
|
id="tailuserhtmlsu5.html"></a>
|
|
|
|
|
</body></html>
|
