[mpich-discuss] Using MPI_Waitany for MPI_File Requests
Jeff Hammond
jeff.science at gmail.com
Thu Sep 28 22:36:50 CDT 2017
MPI_Waitsome also works, and I assume you can use that almost anywhere that
MPI_Waitany is used.
I didn't determine for sure if it is the cause, but MPI_Waitall, MPI_Wait,
and MPI_Waitsome all invoke MPI_Grequest progress, whereas MPI_Waitany does
not, and I recall that ROMIO uses generalized requests.
$ grep MPIR_Grequest ../src/mpi/pt2pt/wait*
../src/mpi/pt2pt/waitall.c: mpi_errno = *MPIR_Grequest*_waitall(count,
request_ptrs);
../src/mpi/pt2pt/wait.c: mpi_errno = *MPIR_Grequest*_progress_poke(1,
&request_ptr, status);
../src/mpi/pt2pt/waitsome.c: mpi_errno = *MPIR_Grequest*
_progress_poke(incount,
Jeff
On Thu, Sep 28, 2017 at 9:32 AM, Jeff Hammond <jeff.science at gmail.com>
wrote:
>
> There appears to be a bug in Waitany here. It works with 2x Wait and
> Waitall.
>
> Jeff
>
> jrhammon at klondike:~/Work/INTEL/BUGS$ mpicc mpiio.c && ./a.out
>
> blocking
>
> done
>
> jrhammon at klondike:~/Work/INTEL/BUGS$ mpicc -DNONBLOCKING -DWAITALL
> mpiio.c && ./a.out
>
> nonblocking
>
> waitall
>
> done
>
> jrhammon at klondike:~/Work/INTEL/BUGS$ mpicc -DNONBLOCKING -DWAIT mpiio.c
> && ./a.out
>
> nonblocking
>
> wait
>
> done
>
> wait
>
> done
>
> jrhammon at klondike:~/Work/INTEL/BUGS$ mpicc -DNONBLOCKING -DWAITANY
> mpiio.c && ./a.out
>
> nonblocking
>
> waitany
>
> ^C
>
> jrhammon at klondike:~/Work/INTEL/BUGS$ cat mpiio.c
>
> #include <stdio.h>
>
> #include <mpi.h>
>
>
> int main(int argc, char** argv)
>
> {
>
> MPI_Init(&argc, &argv);
>
>
> int rank;
>
> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>
>
> MPI_Request recv_req;
>
> int int_buf;
>
> MPI_Irecv(&int_buf, 1, MPI_INT, MPI_ANY_SOURCE, 0, MPI_COMM_WORLD,
>
> &recv_req);
>
>
> MPI_File fh;
>
> MPI_File_open(MPI_COMM_WORLD, "output", MPI_MODE_CREATE |
> MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
>
> MPI_File_set_view(fh, 2*sizeof(int)*rank, MPI_INT, MPI_INT, "native",
> MPI_INFO_NULL);
>
>
> #ifdef NONBLOCKING
>
> printf("nonblocking\n");
>
> MPI_Request requests[2] = {MPI_REQUEST_NULL, MPI_REQUEST_NULL};
>
> MPI_File_iwrite(fh, &rank, 1, MPI_INT, &requests[0]);
>
> MPI_File_iwrite(fh, &rank, 1, MPI_INT, &requests[1]);
>
> #if defined(WAITANY)
>
> int index;
>
> printf("waitany\n");
>
> MPI_Waitany(2, requests, &index, MPI_STATUS_IGNORE);
>
> MPI_Waitany(2, requests, &index, MPI_STATUS_IGNORE);
>
> printf("done\n");
>
> #elif defined(WAIT)
>
> printf("wait\n");
>
> MPI_Wait(&requests[0], MPI_STATUS_IGNORE);
>
> printf("done\n");
>
> printf("wait\n");
>
> MPI_Wait(&requests[1], MPI_STATUS_IGNORE);
>
> printf("done\n");
>
> #elif defined(WAITALL)
>
> printf("waitall\n");
>
> MPI_Waitall(2, requests, MPI_STATUSES_IGNORE);
>
> printf("done\n");
>
> #else
>
> #error Define WAITANY, WAIT, or WAITALL
>
> #endif
>
> #else
>
> printf("blocking\n");
>
> MPI_File_write(fh, &rank, 1, MPI_INT, MPI_STATUS_IGNORE);
>
> MPI_File_write(fh, &rank, 1, MPI_INT, MPI_STATUS_IGNORE);
>
> printf("done\n");
>
> #endif
>
> MPI_File_close(&fh);
>
>
> MPI_Finalize();
>
>
> return 0;
>
> }
>
>
>
> On Thu, Sep 28, 2017 at 6:53 AM, Nils-Arne Dreier <
> n.dreier at uni-muenster.de> wrote:
>
>> Dear MPICH community,
>>
>> I'm currently playing around with the File-IO interface of MPI. For any
>> reason, the following code does not running through:
>>
>> #include <iostream>
>> #include <mpi.h>
>>
>> int main(int argc, char** argv)
>> {
>> MPI_Init(&argc, &argv);
>>
>> int rank;
>> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>>
>> MPI_Request recv_req;
>> int int_buf;
>> MPI_Irecv(&int_buf, 1, MPI_INT, MPI_ANY_SOURCE, 0, MPI_COMM_WORLD,
>> &recv_req);
>>
>> MPI_File fh;
>> MPI_File_open(MPI_COMM_WORLD, "output", MPI_MODE_CREATE |
>> MPI_MODE_RDWR,
>> MPI_INFO_NULL, &fh);
>> MPI_File_set_view(fh, 2*sizeof(int)*rank, MPI_INT, MPI_INT,
>> "native", MPI_INFO_NULL);
>>
>> MPI_Request file_req;
>> MPI_File_iwrite(fh, &rank, 1, MPI_INT, &file_req);
>>
>> MPI_Request file_req2;
>> MPI_File_iwrite(fh, &rank, 1, MPI_INT, &file_req2);
>>
>> MPI_Request requests[2] = {file_req, file_req2};
>> int index;
>> std::cout << rank << ":\twaiting..." << std::endl;
>> MPI_Waitany(2, requests, &index, MPI_STATUS_IGNORE);
>> //MPI_Wait(&file_req, MPI_STATUS_IGNORE);
>> std::cout << rank << ":\tdone" << std::endl;
>> MPI_File_close(&fh);
>>
>> MPI_Finalize();
>>
>> return 0;
>> }
>>
>> Neither if i exchange file_req2 with recv_req, MPI_Waitany doesn't return.
>>
>> Is it possible to use MPI_Waitany with File-IO calls? Did i read
>> anything over in the MPI-Standard?
>>
>> Thank you for your help.
>>
>> Thanks,
>> Nils
>>
>> PS: I'm running Ubuntu 16.04 LTS, gcc-4.9 (using -std=c++14) and MPICH
>> 3.2. This is the output of mpirun --version:
>> HYDRA build details:
>> Version: 3.2
>> Release Date: Wed Nov 11 22:06:48 CST 2015
>> CC: gcc -Wl,-Bsymbolic-functions
>> -Wl,-z,relro
>> CXX: g++ -Wl,-Bsymbolic-functions
>> -Wl,-z,relro
>> F77: gfortran -Wl,-Bsymbolic-functions
>> -Wl,-z,relro
>> F90: gfortran -Wl,-Bsymbolic-functions
>> -Wl,-z,relro
>> Configure options: '--disable-option-checking'
>> '--prefix=/usr' '--build=x86_64-linux-gnu'
>> '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
>> '--infodir=${prefix}/share/info' '--sysconfdir=/etc'
>> '--localstatedir=/var' '--disable-silent-rules'
>> '--libdir=${prefix}/lib/x86_64-linux-gnu'
>> '--libexecdir=${prefix}/lib/x86_64-linux-gnu'
>> '--disable-maintainer-mode' '--disable-dependency-tracking'
>> '--enable-shared' '--enable-fortran=all' '--disable-rpath'
>> '--disable-wrapper-rpath' '--sysconfdir=/etc/mpich'
>> '--libdir=/usr/lib/x86_64-linux-gnu' '--includedir=/usr/include/mpich'
>> '--docdir=/usr/share/doc/mpich' '--with-hwloc-prefix=system'
>> '--enable-checkpointing' '--with-hydra-ckpointlib=blcr' 'CPPFLAGS=
>> -Wdate-time -D_FORTIFY_SOURCE=2
>> -I/build/mpich-jQtQ8p/mpich-3.2/src/mpl/include
>> -I/build/mpich-jQtQ8p/mpich-3.2/src/mpl/include
>> -I/build/mpich-jQtQ8p/mpich-3.2/src/openpa/src
>> -I/build/mpich-jQtQ8p/mpich-3.2/src/openpa/src -D_REENTRANT
>> -I/build/mpich-jQtQ8p/mpich-3.2/src/mpi/romio/include' 'CFLAGS= -g -O2
>> -fstack-protector-strong -Wformat -Werror=format-security -O2'
>> 'CXXFLAGS= -g -O2 -fstack-protector-strong -Wformat
>> -Werror=format-security -O2' 'FFLAGS= -g -O2 -fstack-protector-strong
>> -O2' 'FCFLAGS= -g -O2 -fstack-protector-strong -O2'
>> 'build_alias=x86_64-linux-gnu' 'MPICHLIB_CFLAGS=-g -O2
>> -fstack-protector-strong -Wformat -Werror=format-security'
>> 'MPICHLIB_CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
>> 'MPICHLIB_CXXFLAGS=-g -O2 -fstack-protector-strong -Wformat
>> -Werror=format-security' 'MPICHLIB_FFLAGS=-g -O2
>> -fstack-protector-strong' 'MPICHLIB_FCFLAGS=-g -O2
>> -fstack-protector-strong' 'LDFLAGS=-Wl,-Bsymbolic-functions
>> -Wl,-z,relro' 'FC=gfortran' 'F77=gfortran' 'MPILIBNAME=mpich'
>> '--cache-file=/dev/null' '--srcdir=.' 'CC=gcc' 'LIBS=-lpthread '
>> Process Manager: pmi
>> Launchers available: ssh rsh fork slurm ll lsf
>> sge manual persist
>> Topology libraries available: hwloc
>> Resource management kernels available: user slurm ll lsf sge pbs
>> cobalt
>> Checkpointing libraries available: blcr
>> Demux engines available: poll select
>>
>>
>> --
>> Nils-Arne Dreier, M.Sc.
>> Institute for Computational und Applied Mathematics,
>> University of Münster, Orleans-Ring 10, D-48149 Münster
>> Tel: +49 251 83-35147
>>
>>
>> _______________________________________________
>> discuss mailing list discuss at mpich.org
>> To manage subscription options or unsubscribe:
>> https://lists.mpich.org/mailman/listinfo/discuss
>>
>
>
>
> --
> Jeff Hammond
> jeff.science at gmail.com
> http://jeffhammond.github.io/
>
--
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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