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<div style="background:#FFDDDD;font-size:120%;text-align:center;margin:0;padding:5px">Help us improve by taking our short survey: <a href="https://www.hdfgroup.org/website-survey/">https://www.hdfgroup.org/website-survey/</a></div>
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<div id="projectname">HDF5<span id="projectnumber">&#160;Last Updated on 2026-09-24</span>
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<div class="textblock"><code>#include &quot;<a class="el" href="_h5public_8h.html">H5public.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="_h5_cpublic_8h.html">H5Cpublic.h</a>&quot;</code><br />
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Data Structures</h2></td></tr>
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Macros</h2></td></tr>
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<a name="doc-define-members" id="doc-define-members"></a><h2 id="header-doc-define-members" class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aa1f7f6392005e5678f609043d644512b">&#9670;&#160;</a></span>H5AC__CACHE_IMAGE__ENTRY_AGEOUT__MAX</h2>
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<td class="memname">#define H5AC__CACHE_IMAGE__ENTRY_AGEOUT__MAX&#160;&#160;&#160;100</td>
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<p>Limit on number of times a prefetched entry can appear in subsequent cache images </p><dl class="section since"><dt>Since</dt><dd>1.10.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a4d2023e273e0cdda3c350e4de91baf78">&#9670;&#160;</a></span>H5AC__CACHE_IMAGE__ENTRY_AGEOUT__NONE</h2>
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<td class="memname">#define H5AC__CACHE_IMAGE__ENTRY_AGEOUT__NONE&#160;&#160;&#160;-1</td>
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<p>No limit on number of times a prefetched entry can appear in subsequent cache images </p><dl class="section since"><dt>Since</dt><dd>1.10.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a3f9ce24b57f5ff1b5a1a301f47f89799">&#9670;&#160;</a></span>H5AC__CURR_CACHE_CONFIG_VERSION</h2>
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<td class="memname">#define H5AC__CURR_CACHE_CONFIG_VERSION&#160;&#160;&#160;1</td>
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<p>Current version number of the metadata cache configuration structure </p><dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<a id="a2456b36b5c16ebe3de021513544bb1cf" name="a2456b36b5c16ebe3de021513544bb1cf"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2456b36b5c16ebe3de021513544bb1cf">&#9670;&#160;</a></span>H5AC__CURR_CACHE_IMAGE_CONFIG_VERSION</h2>
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<td class="memname">#define H5AC__CURR_CACHE_IMAGE_CONFIG_VERSION&#160;&#160;&#160;1</td>
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<p>Current version number of the metadata cache image configuration structure </p><dl class="section since"><dt>Since</dt><dd>1.10.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a717f1f3545cfc3d1b2208c96cc0c3bd3">&#9670;&#160;</a></span>H5AC__MAX_TRACE_FILE_NAME_LEN</h2>
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<td class="memname">#define H5AC__MAX_TRACE_FILE_NAME_LEN&#160;&#160;&#160;1024</td>
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<p>Maximum allowed length (in characters) of a metadata cache trace file name </p><dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<a id="af7cea0f4927dfafa3017a34e2b84cce3" name="af7cea0f4927dfafa3017a34e2b84cce3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af7cea0f4927dfafa3017a34e2b84cce3">&#9670;&#160;</a></span>H5AC_METADATA_WRITE_STRATEGY__DISTRIBUTED</h2>
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<td class="memname">#define H5AC_METADATA_WRITE_STRATEGY__DISTRIBUTED&#160;&#160;&#160;1</td>
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<p>Process 0 determines which metadata entries to flush, but the actual writes are distributed across processes at a sync point, with coordination ensuring each entry is flushed exactly once and marked clean everywhere. </p><dl class="section since"><dt>Since</dt><dd>1.8.6 </dd></dl>
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<a id="a5ef1a23a562608db819d7e805f490404" name="a5ef1a23a562608db819d7e805f490404"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5ef1a23a562608db819d7e805f490404">&#9670;&#160;</a></span>H5AC_METADATA_WRITE_STRATEGY__PROCESS_0_ONLY</h2>
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<td class="memname">#define H5AC_METADATA_WRITE_STRATEGY__PROCESS_0_ONLY&#160;&#160;&#160;0</td>
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<p>Only process 0 performs metadata writes to disk; other processes retain dirty metadata and mark entries clean only after process 0 flushes them and broadcasts the results at a sync point. </p><dl class="section since"><dt>Since</dt><dd>1.8.6 </dd></dl>
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