v8.getHeapSnapshot()

• 返回: <stream.Readable> 包含 V8 堆快照的可读流

生成当前 V8 堆的快照并返回可用于读取 JSON 序列化表示的可读流。 此 JSON 流格式旨在与 Chrome 开发者工具等工具一起使用。 JSON 模式未记录并且特定于 V8 引擎。 因此，模式可能会从 V8 的一个版本更改为下一个版本。

创建堆快照需要的内存大约是创建快照时堆大小的两倍。 这会导致 OOM 杀手终止进程的风险。

生成快照是一个同步的操作，它会根据堆大小在一段时间内阻塞事件循环。

// 打印堆快照到控制台
const v8 = require('node:v8');
const stream = v8.getHeapSnapshot();
stream.pipe(process.stdout);

• Returns: <stream.Readable> A Readable Stream containing the V8 heap snapshot

Generates a snapshot of the current V8 heap and returns a Readable Stream that may be used to read the JSON serialized representation. This JSON stream format is intended to be used with tools such as Chrome DevTools. The JSON schema is undocumented and specific to the V8 engine. Therefore, the schema may change from one version of V8 to the next.

Creating a heap snapshot requires memory about twice the size of the heap at the time the snapshot is created. This results in the risk of OOM killers terminating the process.

Generating a snapshot is a synchronous operation which blocks the event loop for a duration depending on the heap size.

// Print heap snapshot to the console
const v8 = require('node:v8');
const stream = v8.getHeapSnapshot();
stream.pipe(process.stdout);