diff options
Diffstat (limited to 'src/H5P.c')
| -rw-r--r-- | src/H5P.c | 84 |
1 files changed, 84 insertions, 0 deletions
@@ -2991,6 +2991,90 @@ H5Pget_meta_block_size(hid_t fapl_id, hsize_t *size/*out*/) } +/*------------------------------------------------------------------------- + * Function: H5Pset_sieve_buf_size + * + * Purpose: Sets the maximum size of the data seive buffer used for file + * drivers which are capable of using data sieving. The data sieve + * buffer is used when performing I/O on datasets in the file. Using a + * buffer which is large anough to hold several pieces of the dataset + * being read in for hyperslab selections boosts performance by quite a + * bit. + * + * The default value is set to 64KB, indicating that file I/O for raw data + * reads and writes will occur in at least 64KB blocks. + * Setting the value to 0 with this API function will turn off the + * data sieving, even if the VFL driver attempts to use that strategy. + * + * Return: Non-negative on success/Negative on failure + * + * Programmer: Quincey Koziol + * Thursday, September 21, 2000 + * + * Modifications: + * + *------------------------------------------------------------------------- + */ +herr_t +H5Pset_sieve_buf_size(hid_t fapl_id, hsize_t size) +{ + H5F_access_t *fapl = NULL; + + FUNC_ENTER (H5Pset_sieve_buf_size, FAIL); + H5TRACE2("e","ih",fapl_id,size); + + /* Check args */ + if (H5P_FILE_ACCESS != H5P_get_class (fapl_id) || + NULL == (fapl = H5I_object (fapl_id))) { + HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, + "not a file access property list"); + } + + /* Set values */ + fapl->sieve_buf_size = size; + + FUNC_LEAVE (SUCCEED); +} /* end H5Pset_sieve_buf_size() */ + + +/*------------------------------------------------------------------------- + * Function: H5Pget_sieve_buf_size + * + * Purpose: Returns the current settings for the data sieve buffer size + * property from a file access property list. + * + * Return: Non-negative on success/Negative on failure + * + * Programmer: Quincey Koziol + * Thursday, September 21, 2000 + * + * Modifications: + * + *------------------------------------------------------------------------- + */ +herr_t +H5Pget_sieve_buf_size(hid_t fapl_id, hsize_t *size/*out*/) +{ + H5F_access_t *fapl = NULL; + + FUNC_ENTER (H5Pget_sieve_buf_size, FAIL); + H5TRACE2("e","ix",fapl_id,size); + + /* Check args */ + if (H5P_FILE_ACCESS != H5P_get_class (fapl_id) || + NULL == (fapl = H5I_object (fapl_id))) { + HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, + "not a file access property list"); + } + + /* Get values */ + if (size) + *size = fapl->sieve_buf_size; + + FUNC_LEAVE (SUCCEED); +} /* end H5Pget_sieve_buf_size() */ + + /*-------------------------------------------------------------------------- NAME H5P_copy_prop |