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<head><title>Examples</title>
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<!--l. 107--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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href="#tailuserhtmlsu6.html"><span
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class="cmr-12">tail</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlse4.html#userhtmlsu6.html" ><span
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class="cmr-12">up</span></a><span
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class="cmr-12">] </span></p></div>
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<h4 class="subsectionHead"><span class="titlemark"><span
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class="cmr-12">4.1 </span></span> <a
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id="x14-130004.1"></a><span
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class="cmr-12">Examples</span></h4>
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<!--l. 109--><p class="noindent" ><span
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class="cmr-12">The code reported in Figure</span><span
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class="cmr-12"> </span><a
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href="#x14-130011"><span
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class="cmr-12">1</span><!--tex4ht:ref: fig:ex1 --></a> <span
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class="cmr-12">shows how to set and apply the default multilevel</span>
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<span
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class="cmr-12">preconditioner available in the real double precision version of AMG4PSBLAS</span>
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<span
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class="cmr-12">(see Table</span><span
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class="cmr-12"> </span><a
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href="userhtmlse4.html#x13-120151"><span
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class="cmr-12">1</span><!--tex4ht:ref: tab:precinit --></a><span
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class="cmr-12">). This preconditioner is chosen by simply specifying </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">’ML’</span></span></span> <span
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class="cmr-12">as the</span>
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<span
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class="cmr-12">second argument of </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">P%init</span></span></span> <span
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class="cmr-12">(a call to </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">P%set</span></span></span> <span
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class="cmr-12">is not needed) and is applied</span>
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<span
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class="cmr-12">with the CG solver provided by PSBLAS (the matrix of the system to be</span>
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<span
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class="cmr-12">solved is assumed to be positive definite). As previously observed, the modules</span>
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">psb_base_mod</span></span></span><span
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class="cmr-12">, </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">amg_prec_mod</span></span></span> <span
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class="cmr-12">and </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">psb_krylov_mod</span></span></span> <span
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class="cmr-12">must be used by the example</span>
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<span
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class="cmr-12">program.</span>
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<!--l. 119--><p class="indent" > <span
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class="cmr-12">The part of the code concerning the reading and assembling of the sparse matrix</span>
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<span
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class="cmr-12">and the right-hand side vector, performed through the PSBLAS routines for sparse</span>
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<span
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class="cmr-12">matrix and vector management, is not reported here for brevity; the statements</span>
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<span
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class="cmr-12">concerning the deallocation of the PSBLAS data structure are neglected too. The</span>
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<span
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class="cmr-12">complete code can be found in the example program file </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">amg_dexample_ml.f90</span></span></span><span
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class="cmr-12">, in the</span>
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<span
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class="cmr-12">directory </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">examples/fileread</span></span></span> <span
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class="cmr-12">of the AMG4PSBLAS implementation (see</span>
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<span
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class="cmr-12">Section</span><span
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class="cmr-12"> </span><a
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href="userhtmlsu5.html#x12-110003.5"><span
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class="cmr-12">3.5</span><!--tex4ht:ref: sec:ex_and_test --></a><span
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class="cmr-12">). A sample test problem along with the relevant input data is available in</span>
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">examples/fileread/runs</span></span></span><span
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class="cmr-12">. For details on the use of the PSBLAS routines, see the</span>
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<span
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class="cmr-12">PSBLAS User’s Guide</span><span
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class="cmr-12"> </span><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli4.html#XPSBLASGUIDE"><span
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class="cmr-12">16</span></a><span
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class="cmr-12">]</span></span><span
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class="cmr-12">.</span>
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<!--l. 131--><p class="indent" > <span
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class="cmr-12">The setup and application of the default multilevel preconditioner for the real single</span>
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<span
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class="cmr-12">precision and the complex, single and double precision, versions are obtained</span>
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<span
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class="cmr-12">with straightforward modifications of the previous example (see Section</span><span
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class="cmr-12"> </span><a
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href="userhtmlse5.html#x15-140005"><span
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class="cmr-12">5</span><!--tex4ht:ref: sec:userinterface --></a> <span
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class="cmr-12">for</span>
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<span
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class="cmr-12">details). If these versions are installed, the corresponding codes are available in</span>
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">examples/fileread/</span></span></span><span
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class="cmr-12">.</span>
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<!--l. 137--><p class="indent" > <hr class="figure"><div class="figure"
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>
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<a
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id="x14-130011"></a>
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<div class="center"
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>
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<!--l. 138--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-5">
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  use psb_base_mod
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 <br />  use amg_prec_mod
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 <br />  use psb_krylov_mod
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 <br />... ...
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 <br />!
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 <br />! sparse matrix
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 <br />  type(psb_dspmat_type) :: A
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 <br />! sparse matrix descriptor
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 <br />  type(psb_desc_type)   :: desc_A
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 <br />! preconditioner
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 <br />  type(amg_dprec_type)  :: P
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 <br />! right-hand side and solution vectors
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 <br />  type(psb_d_vect_type) :: b, x
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 <br />... ...
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 <br />!
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 <br />! initialize the parallel environment
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 <br />  call psb_init(ictxt)
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 <br />  call psb_info(ictxt,iam,np)
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 <br />... ...
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 <br />!
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 <br />! read and assemble the spd matrix A and the right-hand side b
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 <br />! using PSBLAS routines for sparse matrix / vector management
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 <br />... ...
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 <br />!
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 <br />! initialize the default multilevel preconditioner, i.e. V-cycle
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 <br />! with basic smoothed aggregation, 1 hybrid forward/backward
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 <br />! GS sweep as pre/post-smoother and UMFPACK as coarsest-level
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 <br />! solver
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 <br />  call P%init(’ML’,info)
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 <br />!
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 <br />! build the preconditioner
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 <br />  call P%hierarchy_build(A,desc_A,info)
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 <br />  call P%smoothers_build(A,desc_A,info)
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 <br />
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 <br />!
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 <br />! set the solver parameters and the initial guess
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 <br />  ... ...
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 <br />!
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 <br />! solve Ax=b with preconditioned CG
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 <br />  call psb_krylov(’CG’,A,P,b,x,tol,desc_A,info)
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 <br />  ... ...
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 <br />!
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 <br />! deallocate the preconditioner
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 <br />  call P%free(info)
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 <br />!
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 <br />! deallocate other data structures
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 <br />  ... ...
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 <br />!
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 <br />! exit the parallel environment
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 <br />  call psb_exit(ictxt)
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 <br />  stop
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</div>
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<!--l. 193--><p class="nopar" >
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</div>
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<br /> <div class="caption"
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><span class="id">Figure 1: </span><span
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class="content">setup and application of the default multilevel preconditioner (example 1). </span></div><!--tex4ht:label?: x14-130011 -->
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</div>
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<!--l. 199--><p class="indent" > </div><hr class="endfigure">
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<!--l. 201--><p class="indent" > <span
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class="cmr-12">Different versions of the multilevel preconditioner can be obtained by changing the</span>
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<span
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class="cmr-12">default values of the preconditioner parameters. The code reported in Figure</span><span
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class="cmr-12"> </span><a
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href="#x14-130022"><span
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class="cmr-12">2</span><!--tex4ht:ref: fig:ex2 --></a> <span
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class="cmr-12">shows</span>
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<span
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class="cmr-12">how to set a V-cycle preconditioner which applies 1 block-Jacobi sweep as pre- and</span>
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<span
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class="cmr-12">post-smoother, and solves the coarsest-level system with 8 block-Jacobi sweeps. Note</span>
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<span
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class="cmr-12">that the ILU(0) factorization (plus triangular solve) is used as local solver for the</span>
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<span
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class="cmr-12">block-Jacobi sweeps, since this is the default associated with block-Jacobi</span>
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<span
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class="cmr-12">and set by</span><span
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class="cmr-12"> </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">P%init</span></span></span><span
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class="cmr-12">. Furthermore, specifying block-Jacobi as coarsest-level</span>
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<span
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class="cmr-12">solver implies that the coarsest-level matrix is distributed among the processes.</span>
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<span
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class="cmr-12">Figure</span><span
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class="cmr-12"> </span><a
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href="#x14-130033"><span
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class="cmr-12">3</span><!--tex4ht:ref: fig:ex3 --></a> <span
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class="cmr-12">shows how to set a W-cycle preconditioner using the Coarsening</span>
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<span
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class="cmr-12">based on Compatible Weighted Matching. It applies 2 hybrid Gauss-Seidel</span>
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<span
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class="cmr-12">sweeps as pre- and post-smoother, and solves the coarsest-level system with the</span>
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<span
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class="cmr-12">multifrontal LU factorization implemented in MUMPS. It is specified that the</span>
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<span
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class="cmr-12">coarsest-level matrix is distributed, since MUMPS can be used on both replicated and</span>
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<span
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class="cmr-12">distributed matrices, and by default it is used on replicated ones. The code</span>
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<span
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class="cmr-12">fragments shown in Figures</span><span
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class="cmr-12"> </span><a
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href="#x14-130022"><span
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class="cmr-12">2</span><!--tex4ht:ref: fig:ex2 --></a> <span
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class="cmr-12">and </span><a
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href="#x14-130033"><span
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class="cmr-12">3</span><!--tex4ht:ref: fig:ex3 --></a> <span
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class="cmr-12">are included in the example program file</span>
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">amg_dexample_ml.f90</span></span></span> <span
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class="cmr-12">too. </span><span
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class="cmbx-12">DA CORREGGERE NEL CODICE ESEMPIO</span>
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<span
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class="cmbx-12">3</span>
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<!--l. 225--><p class="indent" > <span
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class="cmr-12">Finally, Figure</span><span
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class="cmr-12"> </span><a
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href="#x14-130044"><span
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class="cmr-12">4</span><!--tex4ht:ref: fig:ex4 --></a> <span
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class="cmr-12">shows the setup of a one-level additive Schwarz preconditioner,</span>
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<span
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class="cmr-12">i.e., RAS with overlap 2. Note also that a Krylov method different from CG</span>
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<span
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class="cmr-12">must be used to solve the preconditioned system, since the preconditione in</span>
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<span
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class="cmr-12">nonsymmetric. The corresponding example program is available in the file</span>
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">amg_dexample_1lev.f90</span></span></span><span
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class="cmr-12">.</span>
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<!--l. 232--><p class="indent" > <span
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class="cmr-12">For all the previous preconditioners, example programs where the sparse matrix and</span>
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<span
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class="cmr-12">the right-hand side are generated by discretizing a PDE with Dirichlet boundary</span>
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<span
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class="cmr-12">conditions are also available in the directory </span><span class="obeylines-h"><span class="verb"><span
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class="cmtt-12">examples/pdegen</span></span></span><span
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class="cmr-12">.</span>
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<!--l. 236--><p class="indent" > <hr class="figure"><div class="figure"
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>
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<a
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id="x14-130022"></a>
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<div class="center"
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>
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<!--l. 237--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-6">
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... ...
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 <br />! build a V-cycle preconditioner with 1 block-Jacobi sweep (with
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 <br />! ILU(0) on the blocks) as pre- and post-smoother, and 8  block-Jacobi
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 <br />! sweeps (with ILU(0) on the blocks) as coarsest-level solver
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 <br />  call P%init(’ML’,info)
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 <br />  call_P%set(’SMOOTHER_TYPE’,’BJAC’,info)
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 <br />  call P%set(’COARSE_SOLVE’,’BJAC’,info)
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 <br />  call P%set(’COARSE_SWEEPS’,8,info)
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 <br />  call P%hierarchy_build(A,desc_A,info)
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 <br />  call P%smoothers_build(A,desc_A,info)
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 <br />... ...
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</div>
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<!--l. 252--><p class="nopar" ></div>
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<br /><div class="caption"
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><span class="id">Figure 2: </span><span
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class="content">setup of a multilevel preconditioner based on the default decoupled coarsening</span></div><!--tex4ht:label?: x14-130022 -->
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</div>
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<!--l. 258--><p class="indent" > </div><hr class="endfigure">
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<!--l. 260--><p class="indent" > <hr class="figure"><div class="figure"
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>
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<a
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id="x14-130033"></a>
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<div class="center"
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>
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<!--l. 261--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-7">
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... ...
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 <br />! build a W-cycle preconditioner with 2 hybrid Gauss-Seidel sweeps
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 <br />! as pre- and post-smoother, a distributed coarsest
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 <br />! matrix, and MUMPS as coarsest-level solver
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 <br />  call P%init(’ML’,info)
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 <br />  call P%set(’PAR_AGGR_ALG’,’COUPLED’,info)
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 <br />  call P%set(’ML_CYCLE’,’WCYCLE’,info)
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 <br />  call P%set(’SMOOTHER_TYPE’,’FBGS’,info)
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 <br />  call P%set(’SMOOTHER_SWEEPS’,2,info)
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 <br />  call P%set(’COARSE_SOLVE’,’MUMPS’,info)
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 <br />  call P%set(’COARSE_MAT’,’DIST’,info)
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 <br />  call P%hierarchy_build(A,desc_A,info)
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 <br />  call P%smoothers_build(A,desc_A,info)
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 <br />... ...
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</div>
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<!--l. 279--><p class="nopar" ></div>
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<br /> <div class="caption"
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><span class="id">Figure 3: </span><span
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class="content">setup of a multilevel preconditioner based on the coupled coarsening based
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on weighted matching</span></div><!--tex4ht:label?: x14-130033 -->
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</div>
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<!--l. 284--><p class="indent" > </div><hr class="endfigure">
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<!--l. 286--><p class="indent" > <hr class="figure"><div class="figure"
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>
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<a
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id="x14-130044"></a>
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<div class="center"
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>
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<!--l. 287--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-8">
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... ...
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 <br />! set RAS with overlap 2 and ILU(0) on the local blocks
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 <br />  call P%init(’AS’,info)
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 <br />  call P%set(’SUB_OVR’,2,info)
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 <br />  call P%bld(A,desc_A,info)
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 <br />... ...
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 <br />! solve Ax=b with preconditioned BiCGSTAB
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 <br />  call psb_krylov(’BICGSTAB’,A,P,b,x,tol,desc_A,info)
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</div>
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<!--l. 299--><p class="nopar" ></div>
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<br /> <div class="caption"
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><span class="id">Figure 4: </span><span
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class="content">setup of a one-level Schwarz preconditioner.</span></div><!--tex4ht:label?: x14-130044 -->
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</div>
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<!--l. 304--><p class="indent" > </div><hr class="endfigure">
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<!--l. 1--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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href="userhtmlsu6.html" ><span
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class="cmr-12">front</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlse4.html#userhtmlsu6.html" ><span
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class="cmr-12">up</span></a><span
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class="cmr-12">] </span></p></div>
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<!--l. 1--><p class="indent" > <a
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id="tailuserhtmlsu6.html"></a>
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</body></html>
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