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authorQuincey Koziol <koziol@koziol.gov>2020-06-09 21:24:48 (GMT)
committerQuincey Koziol <koziol@koziol.gov>2020-06-09 21:24:48 (GMT)
commita8a4e9f27b67ae2e22970e42859225adcc2e5cbb (patch)
treebef8f263721f98cacd5b2cfc4f75ca60e710531c /src
parentbc51dea95ac97884874a5a8dbf06d90e61ffa0aa (diff)
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Eliminate allocating file & memory offset & length arrays when performing I/O on a single element.
Diffstat (limited to 'src')
-rw-r--r--src/H5Dselect.c59
1 files changed, 32 insertions, 27 deletions
diff --git a/src/H5Dselect.c b/src/H5Dselect.c
index a843d93..c5469c2 100644
--- a/src/H5Dselect.c
+++ b/src/H5Dselect.c
@@ -113,51 +113,38 @@ H5D__select_io(const H5D_io_info_t *io_info, size_t elmt_size,
HDassert(io_info->store);
HDassert(io_info->u.rbuf);
- /* Get info from API context */
- if(H5CX_get_vec_size(&dxpl_vec_size) < 0)
- HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve I/O vector size")
-
- /* Allocate the vector I/O arrays */
- if(dxpl_vec_size > H5D_IO_VECTOR_SIZE)
- vec_size = dxpl_vec_size;
- else
- vec_size = H5D_IO_VECTOR_SIZE;
- if(NULL == (mem_len = H5FL_SEQ_MALLOC(size_t, vec_size)))
- HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O length vector array")
- if(NULL == (mem_off = H5FL_SEQ_MALLOC(hsize_t, vec_size)))
- HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O offset vector array")
- if(NULL == (file_len = H5FL_SEQ_MALLOC(size_t, vec_size)))
- HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O length vector array")
- if(NULL == (file_off = H5FL_SEQ_MALLOC(hsize_t, vec_size)))
- HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O offset vector array")
-
/* Check for only one element in selection */
if(nelmts == 1) {
+ hsize_t single_mem_off; /* Offset in memory */
+ hsize_t single_file_off; /* Offset in the file */
+ size_t single_mem_len; /* Length in memory */
+ size_t single_file_len; /* Length in the file */
+
/* Get offset of first element in selections */
- if(H5S_SELECT_OFFSET(file_space, file_off) < 0)
+ if(H5S_SELECT_OFFSET(file_space, &single_file_off) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "can't retrieve file selection offset")
- if(H5S_SELECT_OFFSET(mem_space, mem_off) < 0)
+ if(H5S_SELECT_OFFSET(mem_space, &single_mem_off) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "can't retrieve memory selection offset")
/* Set up necessary information for I/O operation */
file_nseq = mem_nseq = 1;
curr_mem_seq = curr_file_seq = 0;
- *file_off *= elmt_size;
- *mem_off *= elmt_size;
- *file_len = *mem_len = elmt_size;
+ single_file_off *= elmt_size;
+ single_mem_off *= elmt_size;
+ single_file_len = single_mem_len = elmt_size;
/* Perform I/O on memory and file sequences */
if(io_info->op_type == H5D_IO_OP_READ) {
if((tmp_file_len = (*io_info->layout_ops.readvv)(io_info,
- file_nseq, &curr_file_seq, file_len, file_off,
- mem_nseq, &curr_mem_seq, mem_len, mem_off)) < 0)
+ file_nseq, &curr_file_seq, &single_file_len, &single_file_off,
+ mem_nseq, &curr_mem_seq, &single_mem_len, &single_mem_off)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_READERROR, FAIL, "read error")
} /* end if */
else {
HDassert(io_info->op_type == H5D_IO_OP_WRITE);
if((tmp_file_len = (*io_info->layout_ops.writevv)(io_info,
- file_nseq, &curr_file_seq, file_len, file_off,
- mem_nseq, &curr_mem_seq, mem_len, mem_off)) < 0)
+ file_nseq, &curr_file_seq, &single_file_len, &single_file_off,
+ mem_nseq, &curr_mem_seq, &single_mem_len, &single_mem_off)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_WRITEERROR, FAIL, "write error")
} /* end else */
@@ -168,6 +155,24 @@ H5D__select_io(const H5D_io_info_t *io_info, size_t elmt_size,
size_t mem_nelem; /* Number of elements used in memory sequences */
size_t file_nelem; /* Number of elements used in file sequences */
+ /* Get info from API context */
+ if(H5CX_get_vec_size(&dxpl_vec_size) < 0)
+ HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve I/O vector size")
+
+ /* Allocate the vector I/O arrays */
+ if(dxpl_vec_size > H5D_IO_VECTOR_SIZE)
+ vec_size = dxpl_vec_size;
+ else
+ vec_size = H5D_IO_VECTOR_SIZE;
+ if(NULL == (mem_len = H5FL_SEQ_MALLOC(size_t, vec_size)))
+ HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O length vector array")
+ if(NULL == (mem_off = H5FL_SEQ_MALLOC(hsize_t, vec_size)))
+ HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O offset vector array")
+ if(NULL == (file_len = H5FL_SEQ_MALLOC(size_t, vec_size)))
+ HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O length vector array")
+ if(NULL == (file_off = H5FL_SEQ_MALLOC(hsize_t, vec_size)))
+ HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate I/O offset vector array")
+
/* Allocate the iterators */
if(NULL == (mem_iter = H5FL_MALLOC(H5S_sel_iter_t)))
HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate memory iterator")