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  1. Concurrent Read/Write File Access

    impossible. For more information on how explicit coordination among processes accessing an HDF5 file currently works, see the HDF5 FAQ https://support.hdfgroup.org/hdf5quest.htmlgrdwt. The solution: concurrent access. The HDF Group is developing a file access pattern known as singlewriter/multiplereader or SWMR for short
    HDF Support PortalDec 12, 2018
  2. H5P_SET_ELINK_ACC_FLAGS

    .rmnavbar Sets the external link traversal file access flag in a link access property list Procedure: H5PSETELINKACCFLAGS ( laplid, flags ) Signature: <pre … : hidt laplid IN: Link access property list identifier unsigned flags IN: The access flag for external link traversal Valid values include: H5FACCRDWR Causes files
    HDF5Aug 06, 2019
  3. Improvements for SWMR File Access and Dataset Append

    Description This document describes changes to the HDF5 Library that improve the SWMR (SingleWriter/MultipleReader) file access model and provide better support for dataset append operations. Design Document designdoc swmrdesign
    HDF5Dec 12, 2017
  4. H5P_GET_ELINK_ACC_FLAGS

    .rmnavbar Retrieves the external link traversal file access flag from the specified link access property list Procedure: H5PGETELINKACCFLAGS ( laplid, flags … ></pre> Parameters: hidt laplid IN: Link access property list identifier unsigned flags OUT: File access flag for link traversal Valid values include: H5FACCRDWR
    HDF5Aug 06, 2019
  5. Can I access an HDF5 file without using the HDF5 library?

    Although it is possible to parse through an HDF5 file using just the file format documentation as a guide, it is strongly recommended that you use the HDF5 library to access HDF5 files instead. The algorithms and data structures stored in an HDF5 file can be complex and difficult to understand well enough to parse
    HDF Knowledge BaseDec 13, 2017
  6. File Access Properties

    HDF5Jan 04, 2018
  7. Are there ways to improve performance when accessing a file that has many groups and many attributes?

    If you have performance problems accessing an HDF5 file with many groups and many attributes, there are some things you can do: Make sure you set H5Psetlibverbounds(...,H5FLIBVERLATEST, H5FLIBVERLATEST) when creating the file such that the newest library features are used. Make sure you close objects that you have
    HDF Knowledge BaseDec 13, 2017
  8. H5F_OPEN

    CHARACTER(LEN=), INTENT(IN) :: name ! Name of the file INTEGER, INTENT(IN) :: accessflag ! File access flags ! Possible values are: ! H5FACCRDWRF ! H5FACCRDONLYF … unsigned flags IN: File access flags. Allowable values are: H5FACCRDWR: Allows read and write access to file H5FACCRDONLY: Allows readonly access to file H5FACCRDWR
    HDF5May 15, 2019
  9. H5F_CREATE

    , accessprp) IMPLICIT NONE CHARACTER(LEN=), INTENT(IN) :: name ! Name of the file INTEGER, INTENT(IN) :: accessflag ! File access flags ! Valid values … ></pre> Parameters: const char name IN: Name of the file to access unsigned flags IN: File access flags. Allowable values are: H5FACCTRUNC Truncate file
    HDF5Dec 20, 2018
  10. H5L_elink_traverse_t

    .rmnavbar Sets the access flags and file access property list used to open the specified external link target Signature: <pre><code class="languagec">typedef … access flag to use when opening a file through an external link. The callback is set with H5PSETELINKCB but will be executed by the HDF5 Library immediately
    HDF5Dec 14, 2017