agreatfool

"use strict";

const msgpack = require('msgpack5')();
const msgpacklite = require("msgpack-lite");
const obj = {name: "jonathan", age: 29, gender: "male"};
const count = 100000;

const try5 = (act) => {
  if (act === "encode") {
    for (let i = 0; i < count; i++) {

agreatfool

// $ node -v
// v8.4.0

"use strict";
var v8 = require("v8");
console.log(v8.getHeapStatistics());

// { total_heap_size: 9437184,    
//   total_heap_size_executable: 3145728,
//   total_physical_size: 6928200,

agreatfool

// $ node -v
// v8.4.0
// node --max-old-space-size=8192

"use strict";
var v8 = require("v8");
console.log(v8.getHeapStatistics());

// { total_heap_size: 9437184,
//   total_heap_size_executable: 3145728,

agreatfool

  --log_gc (Log heap samples on garbage collection for the hp2ps tool.)
        type: bool  default: false
  --expose_gc (expose gc extension)
        type: bool  default: false
  --max_new_space_size (max size of the new generation (in kBytes))
        type: int  default: 0
  --max_old_space_size (max size of the old generation (in Mbytes))
        type: int  default: 0
  --max_executable_size (max size of executable memory (in Mbytes))
        type: int  default: 0

agreatfool

#!/usr/bin/env node

// $ node -v
// v8.4.0

/**
  Debug输出信息的查看，使用：
    DEBUG=MEM:* node xxx.js
  查看内存输出日志：
    DEBUG=MEM:ReportMemory node ...

agreatfool

$ node --expose-gc --trace-gc --trace-gc-verbose ./cases/leak-and-gc.js --normal
[44972:0x103000000] Fast promotion mode: false survival rate: 57%
[44972:0x103000000]       60 ms: Scavenge 3.0 (5.5) -> 2.7 (6.5) MB, 1.2 / 0.0 ms  allocation failure 
[44972:0x103000000] Memory allocator,   used:   6656 KB, available: 1459712 KB
[44972:0x103000000] New space,          used:    581 KB, available:    425 KB, committed:   2048 KB
[44972:0x103000000] Old space,          used:    778 KB, available:      0 KB, committed:   1024 KB
[44972:0x103000000] Code space,         used:   1180 KB, available:      1 KB, committed:   1536KB
[44972:0x103000000] Map space,          used:    201 KB, available:      0 KB, committed:    512 KB
[44972:0x103000000] Large object space, used:      0 KB, available: 1459191 KB, committed:      0 KB
[44972:0x103000000] All spaces,         used:   2741 KB, available: 1459617 KB, committed:   5120KB

agreatfool

#!/usr/bin/env node

// node --expose-gc --trace-gc cases/leak-and-gc.js --normal | node cases/pipe-gc-parser.js
// node --expose-gc --trace-gc-nvp cases/leak-and-gc.js --normal | node cases/pipe-gc-parser.js

"use strict";

const readline = require("readline");
const GcParser = require("v8-gc-log-parser");

agreatfool

$ node -v
v8.4.0
$ node --v8-options | grep gc
  --gc_global (always perform global GCs)
  --gc_interval (garbage collect after <n> allocations)
  --retain_maps_for_n_gc (keeps maps alive for <n> old space garbage collections)
  --trace_gc (print one trace line following each garbage collection)
  --trace_gc_nvp (print one detailed trace line in name=value format after each garbage collection)
  --trace_gc_ignore_scavenger (do not print trace line after scavenger collection)
  --trace_gc_verbose (print more details following each garbage collection)

agreatfool

import * as $protobuf from "protobufjs";

/** Namespace com. */
export namespace com {

    /** Namespace book. */
    namespace book {

        /** Properties of a Book. */
        interface IBook {

agreatfool

// package: com.book
// file: book/book.proto

import * as grpc from "grpc";
import * as book_book_pb from "../book/book_pb";

interface IBookServiceService extends grpc.IMethodsMap {
    getBook: IGetBook;
    getBooksViaAuthor: IGetBooksViaAuthor;
    getGreatestBook: IGetGreatestBook;