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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD

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Salvatore Filippone
2017-12-14 17:09:59 +00:00
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<!--Converted with LaTeX2HTML 2012 (1.2)
original version by: Nikos Drakos, CBLU, University of Leeds
* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
* with significant contributions from:
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>Descriptor data structure</TITLE>
@@ -13,42 +9,43 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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@@ -66,7 +63,7 @@ necessary for implementing the various algorithms of interest to us.
<P>
The data structure itself <code>psb_desc_type</code> can be treated as an
opaque object handled via the tools routines of
Sec.&nbsp;<A HREF="node70.html#sec:toolsrout">6</A> or the query routines detailed below;
Sec.&nbsp;<A HREF="node71.html#sec:toolsrout">6</A> or the query routines detailed below;
nevertheless we include here a description for the curious
reader.
@@ -117,7 +114,7 @@ All methods but the last are purely local; the last method potentially
requires communication among processes, and thus is a synchronous
method. The choice of a specific dynamic type for the index map is
made at the time the descriptor is initially allocated, according to
the mode of initialization (see also&nbsp;<A HREF="node70.html#sec:toolsrout">6</A>).
the mode of initialization (see also&nbsp;<A HREF="node71.html#sec:toolsrout">6</A>).
<P>
The descriptor contents are as follows:
@@ -143,15 +140,14 @@ processes with which it is necessary to communicate:
<LI>Indices of points to be sent;
</LI>
</OL>
The list may contain an arbitrary number of groups; its end is marked
by a -1.
<BR>
Specified as: an allocatable integer array of rank one.
Specified as: a vector of integer type, see&nbsp;<A HREF="node43.html#sec:vecttype">3.3</A>.
</DD>
<DT><STRONG><B>ext_index</B></STRONG></DT>
<DD>A list of element indices to be exchanged to
implement the mapping between a base descriptor and a descriptor
with overlap.
<BR>
Specified as: a vector of integer type, see&nbsp;<A HREF="node43.html#sec:vecttype">3.3</A>.
</DD>
<DT><STRONG><B>ovrlap_index</B></STRONG></DT>
<DD>A list of the overlap elements for the
@@ -169,16 +165,13 @@ current process, organized in groups like the previous vector:
<LI>Indices of points to be sent;
</LI>
</OL>
The list may contain an arbitrary number of groups; its end is marked
by a -1.
<BR>
Specified as: an allocatable integer array of rank one.
Specified as: a vector of integer type, see&nbsp;<A HREF="node43.html#sec:vecttype">3.3</A>.
</DD>
<DT><STRONG><B>ovr_mst_idx</B></STRONG></DT>
<DD>A list to retrieve the value of each
overlap element from the respective master process.
<BR>
Specified as: an allocatable integer array of rank one.
Specified as: a vector of integer type, see&nbsp;<A HREF="node43.html#sec:vecttype">3.3</A>.
</DD>
<DT><STRONG><B>ovrlap_elem</B></STRONG></DT>
<DD>For all overlap points belonging to th
@@ -189,7 +182,7 @@ ecurrent process:
</LI>
<LI>Number of processes sharing that overlap points;
</LI>
<LI>Index of a ``master'' process:
<LI>Index of a &ldquo;master&rdquo; process:
</LI>
</OL>
Specified as: an allocatable integer array of rank two.
@@ -202,7 +195,7 @@ Specified as: an allocatable integer array of rank two.
The Fortran&nbsp;2003 declaration for <code>psb_desc_type</code> structures is
as follows:
<DIV ALIGN="CENTER"><A NAME="fig:desctype"></A><A NAME="917"></A>
<DIV ALIGN="CENTER"><A NAME="fig:desctype"></A><A NAME="931"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 3:</STRONG>
The PSBLAS defined data type that
@@ -214,11 +207,11 @@ The PSBLAS defined data type that
<PRE>
type psb_desc_type
class(psb_indx_map), allocatable :: indxmap
integer, allocatable :: halo_index(:)
integer, allocatable :: ext_index(:)
integer, allocatable :: ovrlap_index(:)
type(psb_i_vect_type) :: v_halo_index
type(psb_i_vect_type) :: v_ext_index
type(psb_i_vect_type) :: v_ovrlap_index
type(psb_i_vect_type) :: v_ovr_mst_idx
integer, allocatable :: ovrlap_elem(:,:)
integer, allocatable :: ovr_mst_idx(:)
integer, allocatable :: bnd_elem(:)
end type psb_desc_type
</PRE></TD></TR>
@@ -227,8 +220,6 @@ end type psb_desc_type
</DIV></TD></TR>
</TABLE>
</DIV>
<P>
A communication descriptor associated with a sparse matrix has a
state, which can take the following values:
<DL>
@@ -249,56 +240,59 @@ state, which can take the following values:
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL>
<LI><A NAME="tex2html352"
HREF="node11.html">Descriptor Methods</A>
<LI><A NAME="tex2html353"
HREF="node12.html">get_local_rows -- Get number of local rows</A>
<UL CLASS="ChildLinks">
<LI><A NAME="tex2html354"
HREF="node13.html">get_local_cols -- Get number of local cols</A>
HREF="node11.html">Descriptor Methods</A>
<LI><A NAME="tex2html355"
HREF="node14.html">get_global_rows -- Get number of global rows</A>
HREF="node12.html">get_local_rows -- Get number of local rows</A>
<LI><A NAME="tex2html356"
HREF="node15.html">get_global_cols -- Get number of global cols</A>
HREF="node13.html">get_local_cols -- Get number of local cols</A>
<LI><A NAME="tex2html357"
HREF="node16.html">get_global_indices -- Get vector of global indices</A>
HREF="node14.html">get_global_rows -- Get number of global rows</A>
<LI><A NAME="tex2html358"
HREF="node17.html">get_context -- Get communication context</A>
HREF="node15.html">get_global_cols -- Get number of global cols</A>
<LI><A NAME="tex2html359"
HREF="node18.html">Clone -- clone current object</A>
HREF="node16.html">get_global_indices -- Get vector of global indices</A>
<LI><A NAME="tex2html360"
HREF="node19.html">psb_cd_get_large_threshold -- Get threshold for
index mapping switch</A>
HREF="node17.html">get_context -- Get communication context</A>
<LI><A NAME="tex2html361"
HREF="node20.html">psb_cd_set_large_threshold -- Set threshold for
index mapping switch</A>
HREF="node18.html">Clone -- clone current object</A>
<LI><A NAME="tex2html362"
HREF="node21.html">Named Constants</A>
HREF="node19.html">CNV -- convert internal storage format</A>
<LI><A NAME="tex2html363"
HREF="node20.html">psb_cd_get_large_threshold -- Get threshold for
index mapping switch</A>
<LI><A NAME="tex2html364"
HREF="node21.html">psb_cd_set_large_threshold -- Set threshold for
index mapping switch</A>
<LI><A NAME="tex2html365"
HREF="node22.html">Named Constants</A>
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