[petsc-users] Memory leak at GPU when updating matrix of type mpiaijcusparse (CUDA)

[Junchao Zhang]

Jorge,
  I found multiple problems in petsc with your example. I have a fix at
https://gitlab.com/petsc/petsc/-/merge_requests/2575
  If everything goes well, it will be in maint and master in a few days.
  Thanks for reporting the problem.
--Junchao Zhang


On Fri, Feb 28, 2020 at 12:13 PM Junchao Zhang <jczhang at mcs.anl.gov> wrote:

> I will take a look at it and get back to you. Thanks.
>
> On Fri, Feb 28, 2020, 7:29 AM jordic <jordic at cttc.upc.edu> wrote:
>
>> Dear all,
>>
>> the following simple program:
>>
>>
>> //////////////////////////////////////////////////////////////////////////////////////
>>
>> #include <petscmat.h>
>>
>> PetscInt ierr=0;
>> int main(int argc,char **argv)
>> {
>>   MPI_Comm comm;
>>   PetscMPIInt rank,size;
>>
>>   PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr;
>>   comm = PETSC_COMM_WORLD;
>>   MPI_Comm_rank(comm,&rank);
>>   MPI_Comm_size(comm,&size);
>>
>>   Mat A;
>>   MatCreate(comm, &A);
>>   MatSetSizes(A, 1, 1, PETSC_DETERMINE, PETSC_DETERMINE);
>>   MatSetFromOptions(A);
>>   PetscInt dnz=1, onz=0;
>>   MatMPIAIJSetPreallocation(A, 0, &dnz, 0, &onz);
>>   MatSetOption(A, MAT_NO_OFF_PROC_ENTRIES, PETSC_TRUE);
>>   MatSetOption(A, MAT_IGNORE_ZERO_ENTRIES, PETSC_TRUE);
>>   PetscInt igid=rank, jgid=rank;
>>   PetscScalar value=rank+1.0;
>>
>> //  for(int i=0; i<10; ++i)
>>   for(;;) //infinite loop
>>   {
>>     MatSetValue(A, igid, jgid, value, INSERT_VALUES);
>>     MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY);
>>     MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY);
>>   }
>>   MatDestroy(&A);
>>   PetscFinalize();
>>   return ierr;
>> }
>>
>>
>> //////////////////////////////////////////////////////////////////////////////////////
>>
>> creates a simple diagonal matrix with one value per mpi-core. If the type
>> of the matrix is "mpiaij" (-mat_type mpiaij) there is no problem but
>> with "mpiaijcusparse" (-mat_type mpiaijcusparse) the memory usage at the
>> GPU grows with every iteration of the infinite loop. The only solution that
>> I found is to destroy and create the matrix every time that it needs to be
>> updated. Is there a better way to avoid this problem?
>>
>> I am using Petsc Release Version 3.12.2 with this configure options:
>>
>> Configure options --package-prefix-hash=/home_nobck/user/petsc-hash-pkgs
>> --with-debugging=0 --with-fc=0 CC=gcc CXX=g++ --COPTFLAGS="-g -O3"
>> --CXXOPTFLAGS="-g -O3" --CUDAOPTFLAGS="-D_FORCE_INLINES -g -O3"
>> --with-mpi-include=/usr/lib/openmpi/include
>> --with-mpi-lib="-L/usr/lib/openmpi/lib -lmpi_cxx -lmpi" --with-cuda=1
>> --with-precision=double --with-cuda-include=/usr/include
>> --with-cuda-lib="-L/usr/lib/x86_64-linux-gnu -lcuda -lcudart -lcublas
>> -lcufft -lcusparse -lcusolver" PETSC_ARCH=arch-ci-linux-opt-cxx-cuda-double
>>
>> Thanks for your help,
>>
>> Jorge
>>
>
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