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| author | Quincey Koziol <koziol@hdfgroup.org> | 2002-06-19 20:16:20 (GMT) |
|---|---|---|
| committer | Quincey Koziol <koziol@hdfgroup.org> | 2002-06-19 20:16:20 (GMT) |
| commit | b1514ea26de7e262a8b010129687dd18b55fa6b1 (patch) | |
| tree | 5ed0b60487a6352c364d38f2b5e818db91503c27 /src/H5D.c | |
| parent | 8aa24fc44a873655183ecab4b3bf54bbd708d7b8 (diff) | |
| download | hdf5-b1514ea26de7e262a8b010129687dd18b55fa6b1.zip hdf5-b1514ea26de7e262a8b010129687dd18b55fa6b1.tar.gz hdf5-b1514ea26de7e262a8b010129687dd18b55fa6b1.tar.bz2 | |
[svn-r5680] Purpose:
New feature.
Description:
There is some discussion among the SAF team as to whether it is better
to use MPI derived types for raw data transfers (thus needing a
MPI_File_set_view() call), or whether it is better to use a sequence of
low-level MPI types (i.e. MPI_BYTE) for the raw data transfer.
Solution:
Added an in internal flag to determine whether derived types are preferred
(the default), or whether they should be avoided. An environment variable
("HDF5_MPI_PREFER_DERIVED_TYPES") can be set by users to control whether MPI
types should be used or not. Set the environment variable to "0" (i.e.:
'setenv HDF5_MPI_PREFER_DERIVED_TYPES 0' to avoid using MPI derived types.
Platforms tested:
IRIX64 6.5 (modi4) w/parallel
Diffstat (limited to 'src/H5D.c')
| -rw-r--r-- | src/H5D.c | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -2280,7 +2280,7 @@ H5D_read(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space, HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "collective access for MPIO driver only"); /* Set the "parallel I/O possible" flag, for H5S_find() */ - if (H5_mpi_opt_types_g && IS_H5FD_MPIO(dataset->ent.file)) { + if (H5S_mpi_opt_types_g && IS_H5FD_MPIO(dataset->ent.file)) { /* Only collective write should call this since it eventually * calls MPI_File_set_view which is a collective call. * See H5S_mpio_spaces_xfer() for details. @@ -2715,7 +2715,7 @@ H5D_write(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space, HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "collective access for MPIO driver only"); /* Set the "parallel I/O possible" flag, for H5S_find() */ - if (H5_mpi_opt_types_g && IS_H5FD_MPIO(dataset->ent.file)) { + if (H5S_mpi_opt_types_g && IS_H5FD_MPIO(dataset->ent.file)) { /* Only collective write should call this since it eventually * calls MPI_File_set_view which is a collective call. * See H5S_mpio_spaces_xfer() for details. |