[mpich-discuss] Memory leak comparing communicators

[VandeVondele Joost]

actually, the issue seems to be with MPI_Comm_group since translate_ranks can be just commented out.

Joost

________________________________________
From: discuss-bounces at mpich.org [discuss-bounces at mpich.org] on behalf of "Antonio J. Peña" [apenya at mcs.anl.gov]
Sent: Thursday, May 01, 2014 4:08 PM
To: discuss at mpich.org
Subject: Re: [mpich-discuss] Memory leak comparing communicators

Thank you Joost. We'll check this issue. I'll keep you posted.


On 05/01/2014 09:02 AM, VandeVondele Joost wrote:
> Hi Antonio,
>
> I finally reproduced this in a small program. The culprit actually seems to be MPI_Group_translate_ranks, but the leak shows up with a trace to MPI_Comm_compare:
>
> Direct leak of 3072 byte(s) in 96 object(s) allocated from:
>      #0 0x7fdab2e213a8 in __interceptor_malloc ../../../../gcc/libsanitizer/lsan/lsan_interceptors.cc:66
>      #1 0x7fdab3efaf6b in MPIR_Group_create /data/vjoost/mpich-3.1/src/mpi/group/grouputil.c:77
>      #2 0x7fdab3fc8314 in MPIR_Comm_group_impl /data/vjoost/mpich-3.1/src/mpi/comm/comm_group.c:44
>      #3 0x7fdab3fc40d3 in PMPI_Comm_compare /data/vjoost/mpich-3.1/src/mpi/comm/comm_compare.c:122
>      #4 0x4009de in main /data/vjoost/mpich-3.1/debug/2d.c:23
>
>> cat 2d.c
> #include <stdio.h>
> #include <mpi.h>
>
> main(int argc, char **argv)  // needs 2 ranks //
> {
>     MPI_Comm comm_cart, dup_comm_world;
>     int result,reorder;
>     int dim[2], period[2], rin[2], rout[2];
>     int i,j,k;
>     int g1,g2;
>
>     MPI_Init (&argc, &argv);
>
>     for(i=0;i<100;i++)
>     {
>
>        MPI_Comm_dup( MPI_COMM_WORLD, &dup_comm_world);
>        dim[0]=2; dim[1]=1;
>        reorder=0;
>        period[0]=1; period[1]=1;
>        rin[0]=0; rin[1]=1;
>        MPI_Cart_create(dup_comm_world, 2, dim, period, reorder, &comm_cart);
>        MPI_Comm_compare(dup_comm_world, comm_cart, &result );
>        MPI_Comm_group(dup_comm_world,&g1);
>        MPI_Comm_group(comm_cart,&g2);
>        MPI_Group_translate_ranks(g1, 2, rin, g2, rout);
>        MPI_Comm_free(&comm_cart);
>        MPI_Comm_free(&dup_comm_world);
>
>     }
>
>     MPI_Finalize();
>
> }
>
> Thanks,
>
> Joost
>
>
>
>
> ________________________________________
> From: discuss-bounces at mpich.org [discuss-bounces at mpich.org] on behalf of "Antonio J. Peña" [apenya at mcs.anl.gov]
> Sent: Monday, April 28, 2014 6:26 PM
> To: discuss at mpich.org
> Subject: Re: [mpich-discuss] Memory leak comparing communicators
>
> Hi Joost,
>
> Can you share the smallest fragment of code with which we can reproduce
> this?
>
>     Antonio
>
>
> On 04/28/2014 11:25 AM, VandeVondele Joost wrote:
>> Hi,
>>
>> using mpich 3.1 I notice that my application leaks memory. Compiling it with '-O1 -g -fno-omit-frame-pointer -fsanitize=leak' using gcc 4.9 it appears the sources is comparing communicators, for example:
>>
>> [0] Direct leak of 38400 byte(s) in 600 object(s) allocated from:
>> [0]     #0 0x7f84298d53a8 in __interceptor_malloc ../../../../gcc/libsanitizer/lsan/lsan_interceptors.cc:66
>> [0]     #1 0x7f842aabaf6b in MPIR_Group_create /data/vjoost/mpich-3.1/src/mpi/group/grouputil.c:77
>> [0]     #2 0x7f842ab88314 in MPIR_Comm_group_impl /data/vjoost/mpich-3.1/src/mpi/comm/comm_group.c:44
>> [0]     #3 0x7f842ab840d3 in PMPI_Comm_compare /data/vjoost/mpich-3.1/src/mpi/comm/comm_compare.c:122
>> [0]     #4 0x7f842aac8e84 in pmpi_comm_compare_ /data/vjoost/mpich-3.1/src/binding/f77/comm_comparef.c:267
>> [0]     #5 0x1bfd447 in __message_passing_MOD_mp_comm_compare /data/vjoost/clean/cp2k/cp2k/src/common/message_passing.F:1084
>>
>> I'm not seeing other leaks, so is guess something particular is going on here. Any suggestions on a possible fix ?
>>
>> Thanks,
>>
>> Joost
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>
> --
> Antonio J. Peña
> Postdoctoral Appointee
> Mathematics and Computer Science Division
> Argonne National Laboratory
> 9700 South Cass Avenue, Bldg. 240, Of. 3148
> Argonne, IL 60439-4847
> apenya at mcs.anl.gov
> www.mcs.anl.gov/~apenya
>
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--
Antonio J. Peña
Postdoctoral Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
9700 South Cass Avenue, Bldg. 240, Of. 3148
Argonne, IL 60439-4847
apenya at mcs.anl.gov
www.mcs.anl.gov/~apenya

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