[svn-r11939] Purpose:

Supports for collective chunk IO inside parallel HDF5

Description:
Added a macro hdf5_mpi_special_collective_io_works to filter out
          some mpi-io packages that don't support collective IO for no IO
          contributions in some processes.

Solution:
Using AC_CACHE_VAL to do the job.

Platforms tested:
Parallel:

IBM AIX 5.2(copper)
Linux (heping) mpich-1.2.6
SDSC Teragrid mpich-1.2.5
Linux(Tungsten) mpich-1.2.6
Altix(NCSA cobalt)

Seq:
Linux(heping)

Misc. update:

1 files changed, 23 insertions, 0 deletions

diff --git a/configure b/configure
index f265f99..86baeee 100755
--- a/configure
+++ b/configure
@@ -50023,6 +50023,29 @@ else
   echo "$as_me:$LINENO: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
+
+echo "$as_me:$LINENO: checking if MPI-IO can do collective IO when one or more processes don't do IOs" >&5
+echo $ECHO_N "checking if MPI-IO can do collective IO when one or more processes don't do IOs... $ECHO_C" >&6
+
+if test "${hdf5_mpi_special_collective_io_works+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  hdf5_mpi_special_collective_io_works=yes
+fi
+
+
+if test ${hdf5_mpi_special_collective_io_works} = "yes"; then
+
+cat >>confdefs.h <<\_ACEOF
+#define MPI_SPECIAL_COLLECTIVE_IO_WORKS 1
+_ACEOF
+
+  echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+else
+  echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+fi
 fi