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Subject: [OMPI users] Questions on MPI I/O and ompi_info
From: Blosch, Edwin L (edwin.l.blosch_at_[hidden])
Date: 2014-02-13 15:01:57

Why does ompi_info -c say "MPI I/O Support: yes" even though I configured using -disable-io-romio? If ompi_info is going to tell me MPI I/O is supported, then shouldn't I expect my test program (attached) to work correctly? (it doesn't).

I didn't disable "built-in" mpi-io, only io-romio.

  --disable-mpi-io Disable built-in support for MPI-2 I/O, likely
                          because an externally-provided MPI I/O package will
                          be used. Default is to use the internal component
                          system and its specially modified version of ROMIO
  --disable-io-romio Disable the ROMIO MPI-IO component



configure options used:
+ ./configure --prefix=/applocal/tools/mpi/intel/openmpi-1.6.4 --without-tm --without-sge --without-lsf --without-psm --without-portals --without-elan --without-slurm --without-loadleveler --with-mxm=/opt/mellanox/mxm --with-mxm-lib=/opt/mellanox/mxm/lib --enable-mpirun-prefix-by-default --enable-contrib-no-build=vt --disable-per-user-config-files --disable-io-romio --enable-static CXX=/applocal/intel/composer_xe_2013/bin/icpc CC=/applocal/intel/composer_xe_2013/bin/icc 'CFLAGS= -O2' 'CXXFLAGS= -O2' F77=/applocal/intel/composer_xe_2013/bin/ifort 'FFLAGS=-D_GNU_SOURCE -traceback -O2' FC=/applocal/intel/composer_xe_2013/bin/ifort 'FCFLAGS=-D_GNU_SOURCE -traceback -O2' 'LDFLAGS= -static-intel'

ompi_info -c output:
           Configured by: bloscel
           Configured on: Tue Jun 11 16:20:00 CDT 2013
          Configure host: mgmt1
                Built by: bloscel
                Built on: Tue Jun 11 16:35:12 CDT 2013
              Built host: mgmt1
              C bindings: yes
            C++ bindings: yes
      Fortran77 bindings: yes (all)
      Fortran90 bindings: yes
Fortran90 bindings size: small
              C compiler: /applocal/intel/composer_xe_2013/bin/icc
     C compiler absolute:
  C compiler family name: INTEL
      C compiler version: 1310.20130514
             C char size: 1
             C bool size: 1
            C short size: 2
              C int size: 4
             C long size: 8
            C float size: 4
           C double size: 8
          C pointer size: 8
            C char align: 1
            C bool align: 1
             C int align: 4
           C float align: 4
          C double align: 8
            C++ compiler: /applocal/intel/composer_xe_2013/bin/icpc
   C++ compiler absolute: none
      Fortran77 compiler: /applocal/intel/composer_xe_2013/bin/ifort
  Fortran77 compiler abs:
      Fortran90 compiler: /applocal/intel/composer_xe_2013/bin/ifort
  Fortran90 compiler abs:
       Fort integer size: 4
       Fort logical size: 4
Fort logical value true: -1
      Fort have integer1: yes
      Fort have integer2: yes
      Fort have integer4: yes
      Fort have integer8: yes
     Fort have integer16: no
         Fort have real4: yes
         Fort have real8: yes
        Fort have real16: no
      Fort have complex8: yes
     Fort have complex16: yes
     Fort have complex32: no
      Fort integer1 size: 1
      Fort integer2 size: 2
      Fort integer4 size: 4
      Fort integer8 size: 8
     Fort integer16 size: -1
          Fort real size: 4
         Fort real4 size: 4
         Fort real8 size: 8
        Fort real16 size: 16
      Fort dbl prec size: 8
          Fort cplx size: 8
      Fort dbl cplx size: 16
         Fort cplx8 size: 8
        Fort cplx16 size: 16
        Fort cplx32 size: 32
      Fort integer align: 1
     Fort integer1 align: 1
     Fort integer2 align: 1
     Fort integer4 align: 1
     Fort integer8 align: 1
    Fort integer16 align: -1
         Fort real align: 1
        Fort real4 align: 1
        Fort real8 align: 1
       Fort real16 align: 1
     Fort dbl prec align: 1
         Fort cplx align: 1
     Fort dbl cplx align: 1
        Fort cplx8 align: 1
       Fort cplx16 align: 1
       Fort cplx32 align: 1
             C profiling: yes
           C++ profiling: yes
     Fortran77 profiling: yes
     Fortran90 profiling: yes
          C++ exceptions: no
          Thread support: posix (MPI_THREAD_MULTIPLE: no, progress: no)
           Sparse Groups: no
            Build CFLAGS: -DNDEBUG -O2 -finline-functions -fno-strict-aliasing -restrict -pthread
          Build CXXFLAGS: -DNDEBUG -O2 -finline-functions -pthread
            Build FFLAGS: -D_GNU_SOURCE -traceback -O2
           Build FCFLAGS: -D_GNU_SOURCE -traceback -O2
           Build LDFLAGS: -export-dynamic -static-intel
              Build LIBS: -lrt -lnsl -lutil
    Wrapper extra CFLAGS: -pthread
  Wrapper extra CXXFLAGS: -pthread
    Wrapper extra FFLAGS:
   Wrapper extra FCFLAGS:
   Wrapper extra LDFLAGS:
      Wrapper extra LIBS: -ldl -lm -lnuma -Wl,--export-dynamic -lrt -lnsl -lutil
  Internal debug support: no
  MPI interface warnings: no
     MPI parameter check: runtime
Memory profiling support: no
Memory debugging support: no
         libltdl support: yes
   Heterogeneous support: no
mpirun default --prefix: yes
         MPI I/O support: yes
       MPI_WTIME support: gettimeofday
     Symbol vis. support: yes
   Host topology support: yes
          MPI extensions: affinity example
   FT Checkpoint support: no (checkpoint thread: no)
     VampirTrace support: no
        MPI_MAX_INFO_KEY: 36
        MPI_MAX_INFO_VAL: 256
       MPI_MAX_PORT_NAME: 1024