node . js V8 . getheapstatics()方法
原文:https://www . geesforgeks . org/node-js-V8-getheap statistics-method/
v8 . getheapstaticts()方法是 v8 模块的内置应用编程接口，用于获取从 V8 版本派生的堆的统计信息。
语法:
v8.getHeapStatistics();
参数:该方法没有任何参数。
返回值:这个方法返回一个包含版本 8 堆统计信息的对象。返回的对象通常包含一个数组，该数组由以下字段组成:
- Total _ heap _ size : A number indicating the total heap size.
- Total _ heap _ size _ executive : A number indicating the total size of the executable heap.
- [T0】 total _ physical _ size 【T1]: A number representing the total physical size.
- [T0】 total _ available _ size 【T1]: A number indicating the total available size.
- [T0】 used _ heap _ size 【T1]: a number indicating the used heap size.
- heap size limit : a number indicating the heap size limit.
- 玛洛蒂 _ memory :云娥，什么事记忆模糊。
- peak _ malloced _ memory :一个数字,表示最大记忆记忆.
- [T0】 do _ zap _ garbage dump : A number, especially a Boolean value, indicating whether the–-zap _ code _ space option is enabled or not.
- number _ of _ native _ contexts : a number indicating the number of native contexts or top-level contexts currently active. Memory leakage can be indicated by measuring the increment of this number with time.
- Number _ of _ disconnected _ contexts : A number that represents multiple separated contexts or contexts that have been separated but not yet garbage collected. If it has a non-zero value, it may indicate a memory leak.
下面的例子说明了在 Node.js 中使用 v8.getHeapStatistics()方法
示例 1: 文件名:index.js
// Accessing v8 module
const v8 = require('v8');
// Calling v8.getHeapStatistics()
console.log(v8.getHeapStatistics());
使用以下命令运行 index.js 文件:
node index.js
输出:
{ total_heap_size: 6537216,
total_heap_size_executable: 1048576,
total_physical_size: 6537216,
total_available_size: 1520717240,
used_heap_size: 4199600,
heap_size_limit: 1526909922,
malloced_memory: 8192,
peak_malloced_memory: 406408,
does_zap_garbage: 0 }
示例 2: 文件名:
// Accessing v8 module
const v8 = require('v8');
// Calling v8.getHeapStatistics()
stats = v8.getHeapStatistics();
console.log("Heap Stastistics are :");
console.log("total_heap_size:"+stats['total_heap_size']);
console.log("used_heap_size:"+stats['used_heap_size']);
console.log("heap_size_limit:"+stats['heap_size_limit']);
console.log("does_zap_garbage:"+stats['does_zap_garbage']);
使用以下命令运行 index.js 文件:
node index.js
输出:
Heap Stastistics are :
total_heap_size:6537216
used_heap_size:4200640
heap_size_limit:1526909922
does_zap_garbage:0
参考:T2】https://nodejs.org/api/v8.html#v8_v8_getheapstatistics
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