1.5 KiB
Tracing
Stability: 1 - Experimental
The tracing module is designed for instrumenting your Node application. It is not meant for general purpose use.
require('tracing') to use this module.
v8
The v8 property is an [EventEmitter][], it exposes events and interfaces
specific to the version of v8 built with node. These interfaces are subject
to change by upstream and are therefore not covered under the stability index.
Event: 'gc'
function (before, after) { }
Emitted each time a GC run is completed.
before and after are objects with the following properties:
{
type: 'mark-sweep-compact',
flags: 0,
timestamp: 905535650119053,
total_heap_size: 6295040,
total_heap_size_executable: 4194304,
total_physical_size: 6295040,
used_heap_size: 2855416,
heap_size_limit: 1535115264
}
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()
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.
Usage:
// Print GC events to stdout for one minute.
var v8 = require('tracing').v8;
v8.setFlagsFromString('--trace_gc');
setTimeout(function() { v8.setFlagsFromString('--notrace_gc'); }, 60e3);