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<h1>Node.js v4.8.2 Documentation</h1>
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<h2>Table of Contents</h2>
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<li><span class="stability_2"><a href="#v8_v8">V8</a></span><ul>
<li><span class="stability_undefined"><a href="#v8_getheapstatistics">getHeapStatistics()</a></span></li>
<li><span class="stability_undefined"><a href="#v8_getheapspacestatistics">getHeapSpaceStatistics()</a></span></li>
<li><span class="stability_undefined"><a href="#v8_setflagsfromstring_string">setFlagsFromString(string)</a></span></li>
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<h1>V8<span><a class="mark" href="#v8_v8" id="v8_v8">#</a></span></h1>
<pre class="api_stability api_stability_2">Stability: 2 - Stable</pre><p>This module exposes events and interfaces specific to the version of <a href="https://developers.google.com/v8/">V8</a>
built with Node.js. These interfaces are subject to change by upstream and are
therefore not covered under the stability index.</p>
<h2>getHeapStatistics()<span><a class="mark" href="#v8_getheapstatistics" id="v8_getheapstatistics">#</a></span></h2>
<div class="api_metadata">
<span>Added in: v1.0.0</span>
</div><p>Returns an object with the following properties</p>
<pre><code class="lang-js">{
total_heap_size: 7326976,
total_heap_size_executable: 4194304,
total_physical_size: 7326976,
total_available_size: 1152656,
used_heap_size: 3476208,
heap_size_limit: 1535115264
}
</code></pre>
<h2>getHeapSpaceStatistics()<span><a class="mark" href="#v8_getheapspacestatistics" id="v8_getheapspacestatistics">#</a></span></h2>
<p>Returns statistics about the V8 heap spaces, i.e. the segments which make up
the V8 heap. Order of heap spaces nor availability of a heap space can be
guaranteed as the statistics are provided via the V8 <code>GetHeapSpaceStatistics</code>
function.</p>
<p>Example result:</p>
<pre><code>[
{
"space_name": "new_space",
"space_size": 2063872,
"space_used_size": 951112,
"space_available_size": 80824,
"physical_space_size": 2063872
},
{
"space_name": "old_space",
"space_size": 3090560,
"space_used_size": 2493792,
"space_available_size": 0,
"physical_space_size": 3090560
},
{
"space_name": "code_space",
"space_size": 1260160,
"space_used_size": 644256,
"space_available_size": 960,
"physical_space_size": 1260160
},
{
"space_name": "map_space",
"space_size": 1094160,
"space_used_size": 201608,
"space_available_size": 0,
"physical_space_size": 1094160
},
{
"space_name": "large_object_space",
"space_size": 0,
"space_used_size": 0,
"space_available_size": 1490980608,
"physical_space_size": 0
}
]
</code></pre><h2>setFlagsFromString(string)<span><a class="mark" href="#v8_setflagsfromstring_string" id="v8_setflagsfromstring_string">#</a></span></h2>
<div class="api_metadata">
<span>Added in: v1.0.0</span>
</div><p>Set additional V8 command line flags. Use with care; changing settings
after the VM has started may result in unpredictable behavior, including
crashes and data loss. Or it may simply do nothing.</p>
<p>The V8 options available for a version of Node.js may be determined by running
<code>node --v8-options</code>. An unofficial, community-maintained list of options
and their effects is available <a href="https://github.com/thlorenz/v8-flags/blob/master/flags-0.11.md">here</a>.</p>
<p>Usage:</p>
<pre><code class="lang-js">// Print GC events to stdout for one minute.
const v8 = require('v8');
v8.setFlagsFromString('--trace_gc');
setTimeout(function() { v8.setFlagsFromString('--notrace_gc'); }, 60e3);
</code></pre>
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