diff options
author | Allen Byrne <50328838+byrnHDF@users.noreply.github.com> | 2021-05-04 22:46:10 (GMT) |
---|---|---|
committer | GitHub <noreply@github.com> | 2021-05-04 22:46:10 (GMT) |
commit | 021d7c7278fd9c182802f2d5419438716beb37bc (patch) | |
tree | 772b610158e3c771e575a5d7095ebfa589480240 /src/H5FDdirect.h | |
parent | 0801e83615713d95174ed936462310cea32328c7 (diff) | |
download | hdf5-021d7c7278fd9c182802f2d5419438716beb37bc.zip hdf5-021d7c7278fd9c182802f2d5419438716beb37bc.tar.gz hdf5-021d7c7278fd9c182802f2d5419438716beb37bc.tar.bz2 |
Hdf5 1 12 doxygen merge (#615)
* OESS-98 fix tools test for plugins
* sync fork
* Merge of changes from dev
* Move problem option to bottom of the list until fixed
* HDFFV-11106 - fix parsing optional args
* HDFFV-11106 add note
* grammer fix
* Whitespace after clang formatting
* Undo format version 11 changes
* Update check to working version
* Merge workflow and minor changes from develop
* Update supported platforms
* PR#3 merge from develop
* Merge gcc 10 diagnostics option from develop
* Merge #318 OSX changes from develop
* Merge serval small changes from dev
* fix typo
* Minor non-space formatting changes
* GH #386 copyright corrections for java folder
* revert because logic requires false return
* Merges from develop
#358 patches from vtk
#361 fix header guard spelling
* Remove case statement for H5I_EVENTSET
* Correct call with versioning
* Remove tabs
* Double underscore change
* Merges from develop
#340 clang -Wformat-security warnings
#360 Fixed uninitialized warnings
Remove more underscores from header guards
* Merge #380 from develop
* Correct date entry
* Split format source and commit changes on repo push
* remove pre-split setting
* Change windows TS to use older VS.
* HDFFV-11212 JNI export util and Javadoc
* Suggested review changes
* Another change found
* Committing clang-format changes
* Some Javadoc warning fixes
* Committing clang-format changes
* Updated javadoc fixes
* HDFFV-11228/9 merges from develop
* remove obsolete debug comment
* Fix conflict
* HDFFV-11229 merge changes from develop
* HDFFV-11229 merge second compare from develop
* HDFFV-11229 fix reference file
* HDFFV-11229 update autotools test script for two ref files
* HDFFV-11229 merge dev changes for long double display in tools
* Committing clang-format changes
* Update with changes from develop
* Add "option" command for clang options
* Rework CMake add_custom to use the BYPRODUCTS argument
Update pkgconfig scripts for parallel builds.
Fix install COPYING file reference.
Remove unused round defines.
Change CMake default setting of BUILD_CPP to off.
* Whitespace changes
* Rework CMake add_custom to use the BYPRODUCTS argument
* Revert CMake configure checks for round defines
* With VS 2015 minimum strdup is supported
* Doxygen comments merged from develop
* doxygen build updates
* Correct version string for map functions
Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Diffstat (limited to 'src/H5FDdirect.h')
-rw-r--r-- | src/H5FDdirect.h | 63 |
1 files changed, 62 insertions, 1 deletions
diff --git a/src/H5FDdirect.h b/src/H5FDdirect.h index eec10de..f06de7f 100644 --- a/src/H5FDdirect.h +++ b/src/H5FDdirect.h @@ -37,8 +37,69 @@ extern "C" { #define FBSIZE_DEF 4096 #define CBSIZE_DEF 16 * 1024 * 1024 -H5_DLL hid_t H5FD_direct_init(void); +H5_DLL hid_t H5FD_direct_init(void); + +/** + * \ingroup FAPL + * + * \brief Sets up use of the direct I/O driver + * + * \fapl_id + * \param[in] alignment Required memory alignment boundary + * \param[in] block_size File system block size + * \param[in] cbuf_size Copy buffer size + * \returns \herr_t + * + * \details H5Pset_fapl_direct() sets the file access property list, \p fapl_id, + * to use the direct I/O driver, #H5FD_DIRECT. With this driver, data + * is written to or read from the file synchronously without being + * cached by the system. + * + * File systems usually require the data address in memory, the file + * address, and the size of the data to be aligned. The HDF5 library’s + * direct I/O driver is able to handle unaligned data, though that will + * consume some additional memory resources and may slow + * performance. To get better performance, use the system function \p + * posix_memalign to align the data buffer in memory and the HDF5 + * function H5Pset_alignment() to align the data in the file. Be aware, + * however, that aligned data I/O may cause the HDF5 file to be bigger + * than the actual data size would otherwise require because the + * alignment may leave some holes in the file. + * + * \p alignment specifies the required alignment boundary in memory. + * + * \p block_size specifies the file system block size. A value of 0 + * (zero) means to use HDF5 library’s default value of 4KB. + * + * \p cbuf_size specifies the copy buffer size. + * + * \since 1.8.0 + * + */ H5_DLL herr_t H5Pset_fapl_direct(hid_t fapl_id, size_t alignment, size_t block_size, size_t cbuf_size); + +/** + * \ingroup FAPL + * + * \brief Retrieves direct I/O driver settings + * + * \fapl_id + * \param[out] boundary Required memory alignment boundary + * \param[out] block_size File system block size + * \param[out] cbuf_size Copy buffer size + * \returns \herr_t + * + * \details H5Pget_fapl_direct() retrieves the required memory alignment (\p + * alignment), file system block size (\p block_size), and copy buffer + * size (\p cbuf_size) settings for the direct I/O driver, #H5FD_DIRECT, + * from the file access property list \p fapl_id. + * + * See H5Pset_fapl_direct() for discussion of these values, + * requirements, and important considerations. + * + * \since 1.8.0 + * + */ H5_DLL herr_t H5Pget_fapl_direct(hid_t fapl_id, size_t *boundary /*out*/, size_t *block_size /*out*/, size_t *cbuf_size /*out*/); |