diff options
| -rw-r--r-- | src/H5Dio.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/H5Dio.c b/src/H5Dio.c index 600f08a..d1861c4 100644 --- a/src/H5Dio.c +++ b/src/H5Dio.c @@ -810,11 +810,19 @@ H5D__ioinfo_adjust(H5D_io_info_t *io_info, const H5D_t *dset, const H5S_t *file_ io_info->io_ops.single_write = H5D__mpio_select_write; } /* end if */ else { + int comm_size = 0; + + /* Retrieve size of MPI communicator used for file */ + if ((comm_size = H5F_shared_mpi_get_size(io_info->f_sh)) < 0) + HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get MPI communicator size") + /* Check if there are any filters in the pipeline. If there are, - * we cannot break to independent I/O if this is a write operation; - * otherwise there will be metadata inconsistencies in the file. + * we cannot break to independent I/O if this is a write operation + * with multiple ranks involved; otherwise, there will be metadata + * inconsistencies in the file. */ - if (io_info->op_type == H5D_IO_OP_WRITE && io_info->dset->shared->dcpl_cache.pline.nused > 0) { + if (comm_size > 1 && io_info->op_type == H5D_IO_OP_WRITE && + io_info->dset->shared->dcpl_cache.pline.nused > 0) { H5D_mpio_no_collective_cause_t cause; uint32_t local_no_collective_cause; uint32_t global_no_collective_cause; |