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<!doctype html>
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  <title>V8 | Node.js v4.8.2 Manual &amp; Documentation</title>
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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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      <div id="apicontent">
        <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>[
  {
    &quot;space_name&quot;: &quot;new_space&quot;,
    &quot;space_size&quot;: 2063872,
    &quot;space_used_size&quot;: 951112,
    &quot;space_available_size&quot;: 80824,
    &quot;physical_space_size&quot;: 2063872
  },
  {
    &quot;space_name&quot;: &quot;old_space&quot;,
    &quot;space_size&quot;: 3090560,
    &quot;space_used_size&quot;: 2493792,
    &quot;space_available_size&quot;: 0,
    &quot;physical_space_size&quot;: 3090560
  },
  {
    &quot;space_name&quot;: &quot;code_space&quot;,
    &quot;space_size&quot;: 1260160,
    &quot;space_used_size&quot;: 644256,
    &quot;space_available_size&quot;: 960,
    &quot;physical_space_size&quot;: 1260160
  },
  {
    &quot;space_name&quot;: &quot;map_space&quot;,
    &quot;space_size&quot;: 1094160,
    &quot;space_used_size&quot;: 201608,
    &quot;space_available_size&quot;: 0,
    &quot;physical_space_size&quot;: 1094160
  },
  {
    &quot;space_name&quot;: &quot;large_object_space&quot;,
    &quot;space_size&quot;: 0,
    &quot;space_used_size&quot;: 0,
    &quot;space_available_size&quot;: 1490980608,
    &quot;physical_space_size&quot;: 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(&#39;v8&#39;);
v8.setFlagsFromString(&#39;--trace_gc&#39;);
setTimeout(function() { v8.setFlagsFromString(&#39;--notrace_gc&#39;); }, 60e3);
</code></pre>

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