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<p class="MsoNormal">Dear all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using the ASM preconditioner to solve a transposed system through MatSolveTranspose. Strangely, the results I obtain differ in each call. Is there a non-deterministic operations within ASM? If I use it in a non-transposed way, I get
correct results… If I use GASM, then the results are always the same, both in transposed and non-transposed formats.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Below is a log of my calls (note that some of them actually diverged).<o:p></o:p></p>
<p class="MsoNormal">I can give you my matrix and rhs if you want.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Antoine<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 690<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000617544<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 475<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000727253<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 10000<o:p></o:p></p>
<p class="MsoNormal">Residual norm 1.3866<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 568<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000684401<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 540<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000555548<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 10000<o:p></o:p></p>
<p class="MsoNormal">Residual norm 1.30198<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type asm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 207<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000555849<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">---------------<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type gasm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 297<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000600143<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ mpirun -np 4 /gpfs/fs1/aero/SOFTWARE/TOOLS/PROGRAMMING/petsc/src/ksp/ksp/examples/tutorials/ex10 -f0 A_and_rhs.bin -trans -pc_type gasm
<o:p></o:p></p>
<p class="MsoNormal">Number of iterations = 297<o:p></o:p></p>
<p class="MsoNormal">Residual norm 0.000600143<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">Antoine DeBlois</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F"><br>
Specialiste ingenierie, MDO lead / Engineering Specialist, MDO lead<br>
Aéronautique / Aerospace</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#131E29"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">514-855-5001, x 50862<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#131E29"><a href="mailto:antoine.deblois@aero.bombardier.com"><span style="color:blue">antoine.deblois@aero.bombardier.com</span></a><br>
<br>
</span><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">2351 Blvd Alfred-Nobel</span></i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F"><br>
<i>Montreal, Qc<o:p></o:p></i></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">H4S 1A9</span></i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F"><br>
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