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<h4 class="node-heading">gcore man</h4>
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<h3 class="heading">gcore</h3>


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<pre class="format">gcore [-a] [-o <var>prefix</var>] <var>pid1</var> [<var>pid2</var>...<var>pidN</var>]
</pre></div>

<p>Generate core dumps of one or more running programs with process IDs
<var>pid1</var>, <var>pid2</var>, etc.  A core file produced by <code>gcore</code>
is equivalent to one produced by the kernel when the process crashes
(and when <kbd>ulimit -c</kbd> was used to set up an appropriate core dump
limit).  However, unlike after a crash, after <code>gcore</code> finishes
its job the program remains running without any change.
</p>
<dl compact="compact">
<dt><code>-a</code></dt>
<dd><p>Dump all memory mappings.  The actual effect of this option depends on
the Operating System.  On <small>GNU</small>/Linux, it will disable
<code>use-coredump-filter</code> (see <a href="Core-File-Generation.html#set-use_002dcoredump_002dfilter">set use-coredump-filter</a>) and
enable <code>dump-excluded-mappings</code> (see <a href="Core-File-Generation.html#set-dump_002dexcluded_002dmappings">set dump-excluded-mappings</a>).
</p>
</dd>
<dt><code>-o <var>prefix</var></code></dt>
<dd><p>The optional argument <var>prefix</var> specifies the prefix to be used
when composing the file names of the core dumps.  The file name is
composed as <samp><var>prefix</var>.<var>pid</var></samp>, where <var>pid</var> is the
process ID of the running program being analyzed by <code>gcore</code>.
If not specified, <var>prefix</var> defaults to <var>gcore</var>.
</p></dd>
</dl>


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