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# V8
Stability: 2 - Stable
This module exposes events and interfaces specific to the version of [V8][]
built with io.js. These interfaces are subject to change by upstream and are
therefore not covered under the stability index.
## getHeapStatistics()
Returns an object with the following properties
```
{
total_heap_size: 7326976,
total_heap_size_executable: 4194304,
total_physical_size: 7326976,
used_heap_size: 3476208,
heap_size_limit: 1535115264
}
```
## setFlagsFromString(string)
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.
The V8 options available for a version of io.js may be determined by running
`iojs --v8-options`. An unofficial, community-maintained list of options
and their effects is available
[here](https://github.com/thlorenz/v8-flags/blob/master/flags-0.11.md).
Usage:
```
// Print GC events to stdout for one minute.
var v8 = require('v8');
v8.setFlagsFromString('--trace_gc');
setTimeout(function() { v8.setFlagsFromString('--notrace_gc'); }, 60e3);
```
[V8]: https://code.google.com/p/v8/
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