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added a proc shift option to H5MultiBlock, used in I/O benchmarking to defeat caching

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This commit is contained in:
Marc Howison
2009-08-30 18:02:04 +00:00
parent 15ad7b21c5
commit 8dac86872b
7 changed files with 57 additions and 35 deletions
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src/H5MultiBlock.c
+34 -4
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@@ -124,9 +124,10 @@ _get_decomp_and_offsets (
mb->decomp[1],
mb->decomp[0] );
k = f->myproc % mb->decomp[2];
j = (f->myproc / mb->decomp[2]) % mb->decomp[1];
i = f->myproc / (mb->decomp[2] * mb->decomp[1]);
int rank = (f->myproc + mb->proc_shift) % f->nprocs;
k = rank % mb->decomp[2];
j = (rank / mb->decomp[2]) % mb->decomp[1];
i = rank / (mb->decomp[2] * mb->decomp[1]);
/* keep track of blocks that border the edges of the field */
if (i == 0) mb->field_edges |= H5MB_EDGE_Z0;
@@ -761,6 +762,7 @@ _H5MultiBlock_init (
mb->halo = 0;
mb->read = 0;
mb->have_decomp = 0;
mb->proc_shift = 0;
return H5PART_SUCCESS;
}
@@ -1256,5 +1258,33 @@ H5MultiBlockFree (
return H5PART_SUCCESS;
}
#endif
/*!
\ingroup h5multiblock_c_api
Shifts the assignment of procs to blocks within the field.
This is useful mainly for I/O benchmarking, in order to defeat the write
cache when reading in data that was just written out.
\return \c H5PART_SUCCESS
*/
h5part_int64_t
H5MultiBlockShiftProcs (
H5PartFile *f, /* IN: file handle */
const int shift /* IN: shift amount (non-negative) */
) {
SET_FNAME ( "H5MultiBlockShiftProcs" );
MULTIBLOCK_INIT ( f );
if ( shift < 0 ) return H5PART_ERR_INVAL;
struct H5MultiBlockStruct *mb = f->multiblock;
mb->proc_shift = shift;
return H5PART_SUCCESS;
}
#endif // PARALLEL_IO