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authorMuQun Yang <ymuqun@hdfgroup.org>2005-09-20 23:10:08 (GMT)
committerMuQun Yang <ymuqun@hdfgroup.org>2005-09-20 23:10:08 (GMT)
commit4114f888c63ca1fed13d84a93c4bdf173cad443e (patch)
tree2e0c1063af6d02d2fed5e25956ee04c8996639ae /src
parent3267458b648b168e4e627a0a02924533dfd3b149 (diff)
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[svn-r11447] Purpose:
Hyperslab re-build optimization Description: Previously only singluar selection can be rebuilt from span-tree application. This optimization is supposed to rebuild for other regular selection case(such as count =2, block = 2, stride =3) Solution: Platforms tested: shanti(sol 2.9), heping(Linux 2.4), NCAR SGI(IRIX 6.5) Misc. update:
Diffstat (limited to 'src')
-rw-r--r--src/H5Shyper.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/H5Shyper.c b/src/H5Shyper.c
index 92f4b10..10502e8 100644
--- a/src/H5Shyper.c
+++ b/src/H5Shyper.c
@@ -70,6 +70,10 @@ static herr_t H5S_hyper_iter_next(H5S_sel_iter_t *sel_iter, size_t nelem);
static herr_t H5S_hyper_iter_next_block(H5S_sel_iter_t *sel_iter);
static herr_t H5S_hyper_iter_release(H5S_sel_iter_t *sel_iter);
+/* Static function for optimizing hyperslab */
+static int H5S_hyper_check_opt(H5S_hyper_span_t *span, H5S_hyper_dim_t span_slab_info[], int rank);
+static int compare_regular_info( H5S_hyper_dim_t span_slab_info_1, H5S_hyper_dim_t span_slab_info_2);
+
/* Selection properties for hyperslab selections */
const H5S_select_class_t H5S_sel_hyper[1] = {{
H5S_SEL_HYPERSLABS,
@@ -5331,6 +5335,7 @@ done:
} /* H5S_hyper_make_spans() */
+#if 0
/*--------------------------------------------------------------------------
NAME
H5S_hyper_can_rebuild
@@ -5383,6 +5388,180 @@ done:
FUNC_LEAVE_NOAPI(ret_value);
} /* H5S_hyper_can_rebuild() */
+#endif
+static htri_t
+H5S_hyper_can_rebuild (const H5S_t *space)
+{
+ H5S_hyper_dim_t *top_span_slab_info;
+ H5S_hyper_dim_t *diminfo;
+ H5S_hyper_dim_t *app_diminfo;
+ int rank,curr_dim;
+ htri_t ret_value=TRUE; /* Return value */
+
+ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5S_hyper_can_rebuild);
+
+ /* Check args */
+ assert (space);
+ assert (space->select.sel_info.hslab->span_lst);
+
+ rank = space->extent.rank;
+ top_span_slab_info = calloc(rank,sizeof(H5S_hyper_dim_t));
+ if(H5S_hyper_check_opt(space->select.sel_info.hslab->span_lst->head,top_span_slab_info,rank)== -1){
+ ret_value = FALSE;
+ }
+ else {
+
+ diminfo=space->select.sel_info.hslab->opt_diminfo;
+ app_diminfo=space->select.sel_info.hslab->app_diminfo;
+
+ for(curr_dim = 0; curr_dim <rank; curr_dim++) {
+ app_diminfo[rank-curr_dim-1].start = diminfo[rank-curr_dim-1].start = top_span_slab_info[curr_dim].start;
+ app_diminfo[rank-curr_dim-1].stride = diminfo[rank-curr_dim-1].stride = top_span_slab_info[curr_dim].stride;
+ app_diminfo[rank-curr_dim-1].count = diminfo[rank-curr_dim-1].count = top_span_slab_info[curr_dim].count;
+ app_diminfo[rank-curr_dim-1].block = diminfo[rank-curr_dim-1].block = top_span_slab_info[curr_dim].block;
+
+ }
+
+ space->select.sel_info.hslab->diminfo_valid=TRUE;
+ }
+ /* For each level of the span tree check that there is only one span at
+ * that level.
+ */
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value);
+} /* H5S_hyper_can_rebuild() */
+
+static int H5S_hyper_check_opt(H5S_hyper_span_t *span, H5S_hyper_dim_t span_slab_info[], int rank) {
+
+ hsize_t curr_stride,next_stride;
+ hsize_t curr_block,next_block;
+ hsize_t curr_start;
+ hsize_t curr_low;
+ int outcount;
+ int ret_value;
+
+ H5S_hyper_dim_t next_down_span_slab_info;
+ H5S_hyper_dim_t curr_down_span_slab_info;
+ H5S_hyper_span_t *curr_span;
+ H5S_hyper_span_t *next_span;
+ H5S_hyper_span_t *orig_span;
+ H5S_hyper_span_t *next_down_span;
+ H5S_hyper_span_t *curr_down_span;
+
+ curr_stride = 1;
+ curr_block = 0;
+ outcount = 0;
+
+ orig_span = span;
+ /* calculate the first span */
+ if(span) {
+ /* check the current span, if any "down" span is irregular, return -1. */
+ curr_span = span;
+ if(curr_span->down) {
+ curr_down_span = curr_span->down->head;
+ if(curr_down_span) {
+ ret_value = H5S_hyper_check_opt(curr_down_span,span_slab_info,rank -1);
+ curr_down_span_slab_info = span_slab_info[rank-2];
+ if(ret_value == -1) return -1;
+ }
+ else
+ curr_down_span_slab_info.count = 0;
+ }
+ else
+ curr_down_span_slab_info.count = 0;
+
+ /* check the block of this span,if the adjacent block is not the same, irregular selection, return -1. */
+ curr_block = curr_span->high - curr_span->low + 1;
+ curr_low = curr_span->low;
+ curr_start = curr_low;
+
+ span = span->next;
+ outcount ++;
+ }
+
+ while(span) {
+
+ /* check the next span, if any "down" span is irregular, return -1. */
+ next_span = span;
+
+ if(next_span->down) {
+ next_down_span = next_span->down->head;
+ if(next_down_span) {
+ ret_value = H5S_hyper_check_opt(next_down_span,span_slab_info,rank-1);
+ next_down_span_slab_info = span_slab_info[rank-2];
+ if(ret_value == -1) return -1;
+ }
+ else
+ next_down_span_slab_info.count = 0;
+ }
+ else
+ next_down_span_slab_info.count = 0;
+
+ next_stride = next_span->low - curr_low;
+ next_block = next_span->high - next_span->low+1;
+
+
+ /* Compare stride and block in this span*/
+ if(outcount!=1 && curr_stride != next_stride) {
+
+ return -1;
+ }
+ if(next_block != curr_block) {
+
+ return -1;
+ }
+ curr_stride = next_stride;
+ curr_block = next_block;
+ curr_low = next_span->low;
+
+ /* compare the slab information of the down span tree of the adjacent spans */
+
+
+ if(!compare_regular_info(curr_down_span_slab_info,next_down_span_slab_info)) {
+ return -1;
+ }
+
+ curr_down_span_slab_info = next_down_span_slab_info;
+ span = span->next;
+ outcount ++;
+ }
+
+ if(orig_span) {
+ span_slab_info[rank-1].start = curr_start;
+ span_slab_info[rank-1].count = outcount;
+ span_slab_info[rank-1].block = curr_block;
+ span_slab_info[rank-1].stride = curr_stride;
+ }
+
+ return 0;
+
+ }
+
+ /*Compare the slab information of two adjacent down span trees, this function shouldn't
+ be used as a general approach to compare two regular slabs.
+
+ non-zero(true) should be returned if the two slabs are equal or are both NULL.
+ zero should be returned for other cases.
+ */
+
+ static int compare_regular_info( H5S_hyper_dim_t span_slab_info_1, H5S_hyper_dim_t span_slab_info_2) {
+
+ /* Only when the first span of the current span tree has no "down span tree",
+ and the second span of the current span tree has no "down span tree", the selection is a regular selection.
+ Otherwise, for either "no down span tree" case, the selection is irregular.*/
+
+ if((span_slab_info_1.count == 0) && (span_slab_info_2.count ==0 )) return 1;
+ if((span_slab_info_1.count) && (span_slab_info_2.count))
+ return((span_slab_info_1.start == span_slab_info_2.start) &&
+ (span_slab_info_1.stride == span_slab_info_2.stride) &&
+ (span_slab_info_1.block == span_slab_info_2.block) &&
+ (span_slab_info_1.count == span_slab_info_2.count));
+ else
+ return 0;
+}
+
+
/*--------------------------------------------------------------------------
NAME
@@ -5437,6 +5616,11 @@ H5S_hyper_rebuild (H5S_t *space)
app_diminfo[curr_dim].count = diminfo[curr_dim].count = 1;
app_diminfo[curr_dim].block = diminfo[curr_dim].block = (span->high-span->low)+1;
+ HDfprintf(stdout, "start[%d] = %Hu\n",curr_dim,diminfo[curr_dim].start);
+ HDfprintf(stdout, "stride[%d] = %Hu\n",curr_dim,diminfo[curr_dim].stride);
+
+ HDfprintf(stdout, "count[%d] = %Hu\n",curr_dim,diminfo[curr_dim].count);
+ HDfprintf(stdout, "block[%d] = %Hu\n",curr_dim,diminfo[curr_dim].block);
/* Walk down the span tree */
if(span->down) {
span=span->down->head;
@@ -5731,11 +5915,14 @@ H5S_generate_hyperslab (H5S_t *space, H5S_seloper_t op,
* "optimized" start/stride/count/block information.
*/
status=H5S_hyper_can_rebuild(space);
+#if 0
if(status<0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't check for rebuilding hyperslab info");
+ printf("status = %d\n",status);
if(status>0)
if(H5S_hyper_rebuild(space)<0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't rebuild hyperslab info");
+#endif
} /* end if */
} /* end else */
} /* end else */
@@ -6263,11 +6450,14 @@ H5S_operate_hyperslab (H5S_t *result, H5S_hyper_span_info_t *spans1, H5S_seloper
* "optimized" start/stride/count/block information.
*/
status=H5S_hyper_can_rebuild(result);
+ #if 0
if(status<0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't check for rebuilding hyperslab info");
+ printf("status = %d\n",status);
if(status>0)
if(H5S_hyper_rebuild(result)<0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't rebuild hyperslab info");
+ #endif
} /* end if */
} /* end else */
} /* end else */