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| author | Robert Kim Yates <rkyates@llnl.gov> | 1998-08-28 23:37:58 (GMT) |
|---|---|---|
| committer | Robert Kim Yates <rkyates@llnl.gov> | 1998-08-28 23:37:58 (GMT) |
| commit | 1373661a78b7a6d3c7526cd8f80b9ba3460a1d74 (patch) | |
| tree | 83bd2e2ef70d44c57fa8fd53453aea99067ab10a /src/H5O.c | |
| parent | 96c2b5fec405a2dd4a63b7482a431dfc984523df (diff) | |
| download | hdf5-1373661a78b7a6d3c7526cd8f80b9ba3460a1d74.zip hdf5-1373661a78b7a6d3c7526cd8f80b9ba3460a1d74.tar.gz hdf5-1373661a78b7a6d3c7526cd8f80b9ba3460a1d74.tar.bz2 | |
[svn-r630] Added code to eliminate redundant writes of metadata,
so only proc 0 writes it to disk. The elimination is activated
only when the environment variable HDF5_MPI_1_METAWRITE is nonzero;
otherwise all processes that opened the file will write the metadata to disk.
Diffstat (limited to 'src/H5O.c')
| -rw-r--r-- | src/H5O.c | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -506,6 +506,8 @@ H5O_load(H5F_t *f, const haddr_t *addr, const void __unused__ *_udata1, * Robb Matzke, 7 Jan 1998 * Handles constant vs non-constant messages. * + * rky 980828 Only p0 writes metadata to disk. + * *------------------------------------------------------------------------- */ static herr_t @@ -546,6 +548,9 @@ H5O_flush(H5F_t *f, hbool_t destroy, const haddr_t *addr, H5O_t *oh) HDmemset (p, 0, H5O_SIZEOF_HDR(f)-12); /* write the object header header */ +#ifdef HAVE_PARALLEL + H5F_mpio_tas_allsame( f->shared->lf, TRUE ); /* only p0 will write */ +#endif /* HAVE_PARALLEL */ if (H5F_block_write(f, addr, (hsize_t)H5O_SIZEOF_HDR(f), H5D_XFER_DFLT, buf) < 0) { HRETURN_ERROR(H5E_OHDR, H5E_WRITEERROR, FAIL, @@ -618,6 +623,9 @@ H5O_flush(H5F_t *f, hbool_t destroy, const haddr_t *addr, H5O_t *oh) for (i = 0; i < oh->nchunks; i++) { if (oh->chunk[i].dirty) { assert(H5F_addr_defined(&(oh->chunk[i].addr))); +#ifdef HAVE_PARALLEL + H5F_mpio_tas_allsame( f->shared->lf, TRUE ); /* only p0 write */ +#endif /* HAVE_PARALLEL */ if (H5F_block_write(f, &(oh->chunk[i].addr), (hsize_t)(oh->chunk[i].size), H5D_XFER_DFLT, oh->chunk[i].image) < 0) { |