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# V8
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Stability: 2 - Stable
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This module exposes events and interfaces specific to the version of [V8][]
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built with io.js. These interfaces are subject to change by upstream and are
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therefore not covered under the stability index.
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## getHeapStatistics()
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Returns an object with the following properties
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```
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{
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total_heap_size: 7326976,
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total_heap_size_executable: 4194304,
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total_physical_size: 7326976,
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used_heap_size: 3476208,
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heap_size_limit: 1535115264
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}
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```
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## setFlagsFromString(string)
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Set additional V8 command line flags. Use with care; changing settings
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after the VM has started may result in unpredictable behavior, including
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crashes and data loss. Or it may simply do nothing.
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The V8 options available for a version of io.js may be determined by running
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`iojs --v8-options`. An unofficial, community-maintained list of options
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and their effects is available
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[here](https://github.com/thlorenz/v8-flags/blob/master/flags-0.11.md).
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Usage:
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```
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// Print GC events to stdout for one minute.
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var v8 = require('v8');
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v8.setFlagsFromString('--trace_gc');
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setTimeout(function() { v8.setFlagsFromString('--notrace_gc'); }, 60e3);
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```
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[V8]: https://code.google.com/p/v8/
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