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Hdf rm anchor
AnchorNamesummary
Excerpt

Sets alignment properties of a file access property list

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Hdf rm anchor
AnchorNameprocedure

Procedure:
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H5P_SET_ALIGNMENT ( plist, threshold, alignment )

Hdf rm anchor
AnchorNamesignature

Signature:
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classhdf-togglebox hdf-c

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<pre><code class="language-c">herr_t H5Pset_alignment(hid_t plist,
        hsize_t threshold,
        hsize_t alignment
    )
  </code></pre>

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<pre><code class="language-fortran">Fortran90 Interface: h5pset_alignment_f
    
SUBROUTINE h5pset_alignment_f(prp_id, threshold,  alignment, hdferr)
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: prp_id       ! Property list identifier
  INTEGER(HSIZE_T), INTENT(IN) :: threshold  ! Threshold value
  INTEGER(HSIZE_T), INTENT(IN) :: alignment  ! Alignment value
  INTEGER, INTENT(OUT) :: hdferr             ! Error code
                                             ! 0 on success and -1 on failure
END SUBROUTINE h5pset_alignment_f
	</code></pre>

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<pre><code class="language-cpp">Replace this text with the C++ Function Signature</code></pre>
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<pre><code class="language-java">Replace this text with the JAVA Function Signature</code></pre>

hdf-rm-anchor
AnchorNameparameters

Parameters:
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hid_t plistIN: Identifier for a file access property list
hsize_t threshold    IN: Threshold value. Note that setting the threshold value to 0 (zero) has the effect of a special case, forcing everything to be aligned
hsize_t alignmentIN: Alignment value

Hdf rm anchor
AnchorNamedescription

Description:
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H5Pset_alignment sets the alignment properties of a file access property list so that any file object greater than or equal in size to threshold bytes will be aligned on an address which is a multiple of alignment. The addresses are relative to the end of the user block; the alignment is calculated by subtracting the user block size from the absolute file address and then adjusting the address to be a multiple of alignment.

Default values for threshold and alignment are one, implying no alignment. Generally the default values will result in the best performance for single-process access to the file. For MPI IO and other parallel systems, choose an alignment which is a multiple of the disk block size.

If the file space handling strategy is set to H5F_FSPACE_STRATEGY_PAGE, then the alignment set via this routine is ignored. The file space handling strategy is set by H5Pset_file_space_strategy.

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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branchIdrefs/heads/1.10/master
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filepathexamples/h5_subset.c
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lineStart32
progLangcpp
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applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

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branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathfortran/examples/compound.f90
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lineStart25
progLangplain
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applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

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togglebox hdf-cxx hdf-togglebox-hidden

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repoSlughdf5
branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathc++/examples/create.cpp
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progLangcpp
lineEnd43
applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

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classhdf-togglebox hdf-java hdf-togglebox-hidden

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repoSlughdf5
branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathjava/examples/datasets/H5Ex_D_Chunk.java
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lineStart32
progLangjava
lineEnd42
applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

hdf-rm-anchor
AnchorNamehistory
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