e436272897
This changes the code blocks from 4-space indentation to ``` fences for better syntax highlighting and future linting support. Minor On-the-fly changes for typos and highlight breaking markdown have been made. JSON-Style objects have been changed so their closing bracket is on the same line as the opening one. Known issues: * Not every JSON / object notation has been improved. Should make another run for this. * Some example functions break hightlighting due to various combinations of brackets. However changing them means leaving the code style. Fixes: https://github.com/nodejs/node/issues/4726 PR-URL: https://github.com/nodejs/node/pull/4733 Reviewed-By: Roman Reiss <me@silverwind.io>
2.3 KiB
V8
Stability: 2 - Stable
This module exposes events and interfaces specific to the version of V8 built with Node.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,
total_available_size: 1152656,
used_heap_size: 3476208,
heap_size_limit: 1535115264
}
getHeapSpaceStatistics()
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 GetHeapSpaceStatistics
function.
Example result:
[
{
"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
}
]
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 Node.js may be determined by running
node --v8-options. An unofficial, community-maintained list of options
and their effects is available here.
Usage:
// Print GC events to stdout for one minute.
const v8 = require('v8');
v8.setFlagsFromString('--trace_gc');
setTimeout(function() { v8.setFlagsFromString('--notrace_gc'); }, 60e3);