process memory is larger than 1G， cpu is 100% immediately

[sahalazj-github]

process memory is larger than 1G， cpu is 100% immediately

[sahalazj-github]

const v8Profiler = require('v8-profiler-next')
const generateVmHeapsnapshot = (options, callback) => {
    try {
        const { cupFilePath } = options
        console.log('EnterGenerateSnapshot', cupFilePath)
        const snapshot = v8Profiler.takeSnapshot()

        console.log('AfterGenerateSnapshot')

        // 1. not as stream
        const file = fs.createWriteStream(cupFilePath);
        const transform = snapshot.export();
        transform.pipe(file);
        transform.on('finish', snapshot.delete.bind(snapshot));

    } catch(e) {
        console.log('GenerateVmHeapsnapshotError', e)
    }
}

这段代码执行完之后，就会看到进程的cpu立即上升到接近100%,这属于正常现象吗？node版本：12.16.1

[hyj1991]

这是正常的，堆快照序列化是一个比较大的开销，等堆快照生成 cpu 会降下来。

[hyj1991]

相比之下，进程堆内存比较大时，生成的堆快照的体积一般也比较大，且会耗费一定的时间，这个是没问题的。