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Thanks, mark. I am using a sparse matrix from a second-oder vector basis FEM. Will this sparse matrix still use a memory similar to a dense matrix? Thanks, Xiaodong On Thu, Jul 18, 2024 at 6: 00 PM Mark Adams <mfadams@ lbl. gov> wrote: keep
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<div dir="ltr">Thanks, mark. <div>I am using a sparse matrix from a second-oder vector basis FEM. </div><div>Will this sparse matrix still use a memory similar to a dense matrix? </div><div><br></div><div>Thanks,</div><div><br></div><div>Xiaodong </div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 18, 2024 at 6:00 PM Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">keep on the list.</div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 18, 2024 at 5:06 PM neil liu <<a href="mailto:liufield@gmail.com" target="_blank">liufield@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">The matrix size (complex) is 611,432 x 611,432. </div></div></blockquote><div><br></div><div>A dense matrix of that size uses 3 terabytes to store 8*(611,432)^2 bytes.</div><div><br></div><div>That is too big.</div><div><br></div><div>Mark</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 18, 2024 at 4:58 PM Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">How big is your matrix?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 18, 2024 at 4:53 PM neil liu <<a href="mailto:liufield@gmail.com" target="_blank">liufield@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
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Dear Pestc team, I am trying to solve a complex linear system by Petsc KSP. When I committed out this piece code, no errors came out. Will my coding part affect ksp? I am using a direct solver, -pc_type LU. PetscErrorCode ElementInfo: : solveLinearSystem(
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<div dir="ltr">Dear Pestc team,<div><br></div><div>I am trying to solve a complex linear system by Petsc KSP. When I committed out this piece code, no errors came out. Will my coding part affect ksp? I am using a direct solver, -pc_type LU. </div><div><br></div><div><b>PetscErrorCode ElementInfo::solveLinearSystem( ){ </b></div><div><b>PetscFunctionBegin; </b></div><div><b>KSP ksp; </b></div><div><b>KSPCreate(PETSC_COMM_WORLD, &ksp); </b></div><div><b>KSPSetType(ksp, KSPFGMRES); </b></div><div><b>KSPSetOperators(ksp, A, A); </b></div><div><b>KSPSetFromOptions(ksp); KSPSolve(ksp, b, x); </b></div><div><b>KSPDestroy(&ksp); </b></div><div><b>PetscFunctionReturn(PETSC_SUCCESS);</b></div><div><b> }</b><span><br></span></div><div><br></div><div><span>The output with -malloc_test and -malloc_view is attached. It shows the following </span>errors,</div><div><b>Line 5
in the attached file
</b></div>[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------<br>[0]PETSC ERROR: Out of memory. This could be due to allocating<br>[0]PETSC ERROR: too large an object or bleeding by not properly<br>[0]PETSC ERROR: destroying unneeded objects.<br><div>[0] Maximum memory PetscMalloc()ed 19474398848 maximum size of entire process 740352000 (<b><i>This only used 20% of my 64Gb memory .</i></b>)</div><div><span> <b>Line 111 in the attached file</b></span></div><div>[0]PETSC ERROR: Memory requested <b>18446744069642786816 </b>
(<b><i>This is too big.)</i></b><br>[0]PETSC ERROR: See <a href="https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ccZ34UzQhUBbNR8XsOs-FZm2yIW4bzLaYbGGphZTOcDpU5XZNTG_3iagHL_C6Z_e84LvVq04MoQToMzMYfU72jU$" target="_blank">https://petsc.org/release/faq/</a> for trouble shooting.<br>[0]PETSC ERROR: Petsc Release Version 3.21.1, unknown<br>[0]PETSC ERROR: ./app on a arch-linux-c-debug named <a href="https://urldefense.us/v3/__http://kirin.remcominc.com/__;!!G_uCfscf7eWS!ccZ34UzQhUBbNR8XsOs-FZm2yIW4bzLaYbGGphZTOcDpU5XZNTG_3iagHL_C6Z_e84LvVq04MoQToMzM1VQhXLw$" target="_blank">kirin.remcominc.com</a> by xiaodong.liu Thu Jul 18 16:11:52 2024<br>[0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=gfortran --with-cxx=g++ --download-fblaslapack --download-mpich --with-scalar-type=complex --download-triangle<br>[0]PETSC ERROR: #1 PetscMallocAlign() at /home/xiaod<br></div></div>
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