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authorAlbert Cheng <acheng@hdfgroup.org>1998-07-01 21:10:09 (GMT)
committerAlbert Cheng <acheng@hdfgroup.org>1998-07-01 21:10:09 (GMT)
commit0b5e6ee7a13dca7e315ad73886b569af1a7c3554 (patch)
treefbcd746caa5ea6fef07672f588d1b718f576d1d3 /src/H5F.c
parent1b3a1f8014b630208013c7a18cfe8e7c0539e161 (diff)
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[svn-r438] Changes for PHDF5 to support extendable datasets.
H5D.c: If a dataset, using chunk storage, is created/opened and if its data file is accessed via MPIO, allocate file space for the chunks immediately. Also do the allocation when a dataset is extended. Must do it at these points because H5Dcreate, H5Dopen and H5Dextend are collective calls in MPIO access mode and are the only chance to get all MPI processes to synchonize their meta-data. Also disallow opening/creating datasets with compression option if MPIO is used. Not easy to support concurrent compression writes in an efficient way. But read-only access should be fine. Will implement that later. H5F.c: Disable file cache if MPIO is used by forcing cache size and number of elements to zero. H5Fistore.c: Added two new routines, H5F_istore_get_addr and H5F_istore_allocate. H5F_istore_allocate supports allocating file space for the chunks of a dataset. H5F_istore_get_addr returns the file space address of a chunk that has been allocated. Changed H5F_istore_read and H5F_istore_write to bypass the chunk cache read/write mechanism. Instead, they do read/write directly with the file for only the elements requested. (Some debug statements, enclosed by #ifdef AKC, are still in the file. I am still working on some code. They would be cleaned out soon.)
Diffstat (limited to 'src/H5F.c')
-rw-r--r--src/H5F.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/H5F.c b/src/H5F.c
index e209993..4914408 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -529,6 +529,18 @@ H5F_new(H5F_file_t *shared, const H5F_create_t *fcpl, const H5F_access_t *fapl)
"unable to copy file access property list");
}
+#ifdef HAVE_PARALLEL
+ /*
+ * Disable cache if file is open using MPIO driver. Parallel
+ * does not permit caching. (maybe able to relax it for
+ * read only open.)
+ */
+ if (f->shared->access_parms->driver==H5F_LOW_MPIO){
+ f->shared->access_parms->rdcc_nbytes = 0;
+ f->shared->access_parms->mdc_nelmts = 0;
+ }
+#endif
+
/*
* Create a meta data cache with the specified number of elements.
* The cache might be created with a different number of elements and