[petsc-users] [petsc-maint] Out of memory issue related to KSP.

[Mark Adams]

How big is your matrix?

On Thu, Jul 18, 2024 at 4:53 PM neil liu <liufield at gmail.com> wrote:

> 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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> This Message Is From an External Sender
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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( ){ *
> *PetscFunctionBegin; *
> *KSP ksp; *
> *KSPCreate(PETSC_COMM_WORLD, &ksp); *
> *KSPSetType(ksp, KSPFGMRES); *
> *KSPSetOperators(ksp, A, A); *
> *KSPSetFromOptions(ksp); KSPSolve(ksp, b, x); *
> *KSPDestroy(&ksp); *
> *PetscFunctionReturn(PETSC_SUCCESS);*
> * }*
>
> The output with -malloc_test and -malloc_view is attached. It shows the
> following errors,
> *Line 5  in the attached file *
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Out of memory. This could be due to allocating
> [0]PETSC ERROR: too large an object or bleeding by not properly
> [0]PETSC ERROR: destroying unneeded objects.
> [0] Maximum memory PetscMalloc()ed 19474398848 maximum size of entire
> process 740352000 (*This only used 20% of my 64Gb memory .*)
>  *Line 111 in the attached file*
> [0]PETSC ERROR: Memory requested *18446744069642786816 * (*This is too
> big.)*
> [0]PETSC ERROR: See https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!aay4f2-4GIzJEBJpIcqH0Yr7D7_mWjpDVo_xgrhc6gIx6SGtJ9cliIKUYKq_IqoLvI6YDhX3BBPGXCq3Zchzdso$ 
> <https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ccZ34UzQhUBbNR8XsOs-FZm2yIW4bzLaYbGGphZTOcDpU5XZNTG_3iagHL_C6Z_e84LvVq04MoQToMzMYfU72jU$> for
> trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.21.1, unknown
> [0]PETSC ERROR: ./app on a arch-linux-c-debug named kirin.remcominc.com
> <https://urldefense.us/v3/__http://kirin.remcominc.com/__;!!G_uCfscf7eWS!ccZ34UzQhUBbNR8XsOs-FZm2yIW4bzLaYbGGphZTOcDpU5XZNTG_3iagHL_C6Z_e84LvVq04MoQToMzM1VQhXLw$> by
> xiaodong.liu Thu Jul 18 16:11:52 2024
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=gfortran
> --with-cxx=g++ --download-fblaslapack --download-mpich
> --with-scalar-type=complex --download-triangle
> [0]PETSC ERROR: #1 PetscMallocAlign() at /home/xiaod
>
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