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Page Title

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Hdf rm anchor
AnchorNamesummary

Excerpt

Gets information about the write tracking feature used by the core VFD

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Hdf rm anchor
AnchorNameprocedure

Procedure:
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H5P_GET_CORE_WRITE_TRACKING (fapl_id, is_enabled, page_size )

Hdf rm anchor
AnchorNamesignature

Signature:
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<pre><code class="language-c">herr_t H5Pget_core_write_tracking(hid_t 
    fapl_id, hbool_t *is_enabled, size_t 
    *page_size)</code></pre>

Hdf rm anchor
AnchorNameparameters

Parameters:
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hid_t fapl_idIN: File access property list identifier
hbool_t *is_enabledOUT: Whether the feature is enabled
size_t *page_sizeOUT: Size, in bytes, of write aggregation pages

Hdf rm anchor
AnchorNamedescription

Description:
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When a file is created or opened for writing using the core virtual file driver (VFD) with the backing store option turned on, the VFD can be configured to track changes to the file and only write out the modified bytes. To avoid a large number of small writes, the changes can be aggregated into pages of a user-specified size. The core VFD is also known as the memory VFD. The driver identifier is H5FD_CORE.

Note

This function is only for use with the core VFD and must be used after the call to H5P_SET_FAPL_CORE. It is an error to use this function with any other VFD.

This function only applies to the backing store write operation which typically occurs when the file is flushed or closed. This function has no relationship to the increment parameter passed to H5P_SET_FAPL_CORE.

For optimum performance, the page_size parameter should be a power of two.

 

Hdf rm anchor
AnchorNamereturns

Returns:
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Returns a non-negative value if successful. Otherwise returns a negative value.

Hdf rm anchor
AnchorNameexample

Example:
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Comment
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classhdf-togglebox hdf-c

Bitbucket Server file
repoSlughdf5
branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathexamples/h5_subset.c
showLineNumberstrue
lineStart32
progLangcpp
lineEnd42
applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

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Bitbucket Server file
repoSlughdf5
branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathfortran/examples/compound.f90
showLineNumberstrue
lineStart25
progLangplain
lineEnd35
applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

Hdf rm anchor
AnchorNamehistory

History:
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ReleaseChange
1.8.13C function introduced with this release.

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