diff options
Diffstat (limited to 'src/H5S.c')
| -rw-r--r-- | src/H5S.c | 16 |
1 files changed, 11 insertions, 5 deletions
@@ -41,8 +41,9 @@ static size_t H5S_aconv_g = 0; /*entries allocated*/ static size_t H5S_nconv_g = 0; /*entries used*/ #ifdef H5_HAVE_PARALLEL -/* Global var whose value can be set from environment variable also */ -hbool_t H5_mpi_opt_types_g = TRUE; +/* Global vars whose value can be set from environment variable also */ +hbool_t H5S_mpi_opt_types_g = TRUE; +hbool_t H5S_mpi_prefer_derived_types_g = TRUE; #endif /* H5_HAVE_PARALLEL */ /* Declare a free list to manage the H5S_simple_t struct */ @@ -94,9 +95,14 @@ H5S_init_interface(void) { /* Allow MPI buf-and-file-type optimizations? */ const char *s = HDgetenv ("HDF5_MPI_OPT_TYPES"); - if (s && HDisdigit(*s)) { - H5_mpi_opt_types_g = (int)HDstrtol (s, NULL, 0); - } + if (s && HDisdigit(*s)) + H5S_mpi_opt_types_g = (int)HDstrtol (s, NULL, 0); + } + { + /* Prefer MPI derived types for collective data transfers? */ + const char *s = HDgetenv ("HDF5_MPI_PREFER_DERIVED_TYPES"); + if (s && HDisdigit(*s)) + H5S_mpi_prefer_derived_types_g = (int)HDstrtol (s, NULL, 0); } #endif /* H5_HAVE_PARALLEL */ |