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-rw-r--r--src/H5Dio.c14
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;