There appears to be a bug in Waitany here. It works with 2x Wait and Waitall. Jeff jrhammon@klondike:~/Work/INTEL/BUGS$ mpicc mpiio.c && ./a.out blocking done jrhammon@klondike:~/Work/INTEL/BUGS$ mpicc -DNONBLOCKING -DWAITALL mpiio.c && ./a.out nonblocking waitall done jrhammon@klondike:~/Work/INTEL/BUGS$ mpicc -DNONBLOCKING -DWAIT mpiio.c && ./a.out nonblocking wait done wait done jrhammon@klondike:~/Work/INTEL/BUGS$ mpicc -DNONBLOCKING -DWAITANY mpiio.c && ./a.out nonblocking waitany ^C jrhammon@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 <[email protected]> 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

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-- Jeff Hammond [email protected] http://jeffhammond.github.io/ _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss