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12:["$","$L14",null,{"permalink":"https://www.fengkx.top/post/node-memory-optimize/","dateString":"2020-11-18","comments":true,"aplayer":false,"showCopyright":true,"children":[["$","$L15","1644",{"id":"现状-起因","children":["现状 / 起因"]}],"\n",["$","p","1650",{"children":["$L16","的公开 Demo ","$L17"," 随着项目的开源一同上线。也运行了有将近两年了。截至今日（2020/11/18）Demo 有活跃订阅源 3900 + 个。Demo 用 docker 部署在了一台 1C1G 的","$L18","主机上，设定为每十五分钟抓取一次。由于每 15 分钟需要抓取 3k + 的源地址是一个不太轻松的活，抓取的部分是单独使用一个 child_process 进行的。随着订阅数的增长，代码中的一些问题也显现了出来。近期发现","$L19","占用的内存相当的高。特别是在网络不畅通的环境（比如墙内），因为","$L1a","的重试和超时机制，内存占用甚至会突破 Node.js 的限制而导致进程退出。"]}],"\n",["$","$L15","1651",{"id":"排查","children":["排查"]}],"\n",["$","$L1b","1652",{"id":"工具","children":["工具"]}],"\n",["$","p","1656",{"children":["排查内存占用，首先需要找出哪些东西占用了内存。这就用到了 Chrome Dev Tool 中的 memory 面板，在这里可以加载 v8 的 heapsnapshot 并且提供总览，比较等的视图来查找内存占用（被持有）的原因。具体的用法可以看","$L1c","在这里不在赘述。但是官方文档中有部分的东西并没有说的很清楚。比如比较视图的表头几个带",["$","code","1654",{"children":["#"]}],"号的含义就困扰了我一阵子。在 tg 群友的推荐下收获","$L1d","是个很好的补充。"]}],"\n",["$","p","1658",{"children":["Node.js 12 中加入了","$L1e","选项，可以用来生成 heapshot。"]}],"\n",["$","$L1b","1659",{"id":"String-占用","children":["String 占用"]}],"\n",["$","p","1662",{"children":["找出内存占用最快的方式莫过于将一大一小两个 snapshot 放到对比视图中看差值。",["$","code","1660",{"children":["kill"]}]," 一番之后收获",["$","code","1661",{"children":[".heapsnapshot"]}],"两个。"]}],"\n",["$","p","1664",{"children":[["$","$La",null,{"className":"m-img","id":"$undefined","alt":"online-snapshot-compare","style":"$undefined","loading":"lazy","src":"https://vip2.loli.io/2023/03/08/OU5mGByoMbc7iS1.png","width":1162,"height":310,"placeholder":"blur","blurDataURL":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAABCAIAAACZnPOkAAAACXBIWXMAABJ0AAASdAHeZh94AAAAGUlEQVR4nGMwMDB49OjRt2/fpk6dmpSUDABHKgj//wjlrAAAAABJRU5ErkJggg=="}]]}],"\n",["$","p","1668",{"children":["可以看出字符串占了很多，比起别的多了一个数量级。具体来说是 feed 的 xml。下面第二大的 ArrayBufferData 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string 没有任何别的 retainer，这个 string 也没有被 gc。由于 string 是 read only 的，所以这样的优化有助于计算性能。但是在 RSSBot 中就非常致命了。一个 feed 小的也有几百 KB，snapshot 中看到最大的能有 7M。"]}],"\n",["$","$L20","1676",{"id":"解决","children":["解决"]}],"\n",["$","p","1680",{"children":["考虑到我完全不需要 rss 中除",["$","code","1677",{"children":["title"]}],", ",["$","code","1678",{"children":["link"]}],"之外的其他 field。所以我决定直接把 rss-parser 拿掉，换用","$L21","正如 camaro 作者在 README 中写的一样"]}],"\n",["$","blockquote","1682",{"children":["\n",["$","p","1681",{"children":["The whole reason of me creating this is because most of the time, I’m just interested in some of the data in the whole XML mess."]}],"\n"]}],"\n",["$","p","1684",{"children":[["$","$La",null,{"className":"m-img","id":"$undefined","alt":"after-camaro","style":"$undefined","loading":"lazy","src":"https://vip2.loli.io/2023/03/08/Akz2cTOs67E9C4q.png","width":258,"height":266,"placeholder":"blur","blurDataURL":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAIAAAACDbGyAAAACXBIWXMAABJ0AAASdAHeZh94AAAAW0lEQVR4nAFQAK//ANfZ2vDw8Pv7+/7+/v7+/gDR1NLAwcHT1NXg4uLs7e0A1dTLwr653dvX7evl+PbzAKu0uZumr6q0w7rH19Ld6wAAQnIAO3cAJXAADFsAPIDaizXyTwTvzgAAAABJRU5ErkJggg=="}]]}],"\n",["$","p","1685",{"children":["考虑到两次 snapshot 的时间间隔不一致，这样的效果也算是个不小的提升了。但是运行时间长了的话 heap 还是会上到 400MB。还有改进的空间。"]}],"\n",["$","$L1b","1686",{"id":"p-map-fastq","children":["p-map => fastq"]}],"\n",["$","p","1688",{"children":[["$","$La",null,{"className":"m-img","id":"$undefined","alt":"array-obj-memory","style":"$undefined","loading":"lazy","src":"https://vip2.loli.io/2023/03/08/I7SaPQ31i5mBus6.png","width":908,"height":822,"placeholder":"blur","blurDataURL":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAIAAAACDbGyAAAACXBIWXMAABJ0AAASdAHeZh94AAAAW0lEQVR4nAFQAK//AAAGFAMQGigyPSEqNC01PQBXWWJKS1N+gImKkZtrcXcAv7m5n5ORxb269/bzy8vKAHNyc4R/f56bm7a2tpaWlgBZWFmcnZ3q6+u4uLhmZmbJcCWDHrxn6AAAAABJRU5ErkJggg=="}]]}],"\n",["$","p","1692",{"children":["$L22","中使用 p-map 控制请求的并发数量。本来以为不会出现如此长的数组。但阅读 p-map 源码之后发现，",["$","code","1690",{"children":["p-map"]}]," 并不等于任务队列，整个数组和结果数组都会保存起来。",["$","s","1691",{"children":["（废话）不然怎么叫 map"]}]]}],"\n",["$","$L20","1693",{"id":"解决-2","children":["解决"]}],"\n",["$","p","1696",{"children":["是误用了，换掉。我没有选择换成同一系列的",["$","code","1694",{"children":["p-queue"]}],", 因为他的 api 设计不太合适。然后找到了","$L23",", 作者，stars，used by 看下来，再看一下代码。靠谱！果断换掉。"]}],"\n",["$","p","1698",{"children":[["$","$La",null,{"className":"m-img","id":"$undefined","alt":"fastq-snapshots.png","style":"$undefined","loading":"lazy","src":"https://vip2.loli.io/2023/03/08/7HZyDJhbqoKkS35.png","width":256,"height":157,"placeholder":"blur","blurDataURL":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAADCAIAAADUVFKvAAAACXBIWXMAABJ0AAASdAHeZh94AAAANUlEQVR4nGOQkpFgZmYwNjbetWvX0aNHGVRUFdnZmK2trY8ePfr06VMGM3NjDQ21sLBwCB8AbLESq8aYjXsAAAAASUVORK5CYII="}]]}],"\n",["$","p","1699",{"children":["一切看起来是这么的美好～"]}],"\n",["$","$L1b","1700",{"id":"进一步优化","children":["进一步优化"]}],"\n",["$","$L20","1701",{"id":"Manual-gc","children":["Manual gc"]}],"\n",["$","p","1706",{"children":["继续找占用内存的根源，发现还是有一些 xml string 阴魂不散。仔细检查 snapshot，确实应该要被 gc 才对的。于是决定手动 tigger gc。Node.js 提供 ",["$","code","1702",{"children":["--exposed-gc"]}],"选项。在 child_process 的 execArgv 中加上就能使用",["$","code","1703",{"children":["global.gc"]}],"手动触发 gc。递归调用",["$","code","1704",{"children":["setTimeout"]}],"做一个定时 3 分钟一次的 gc。效果显著，snapshot 再也没有阴魂不散的 xml string 了。",["$","br","1705",{}],"\n在本地长期运行，关闭代理模拟大量 feed 出错的情况，多次触发 snapshot，gc 后的 heap 大小表现还是很不错的。"]}],"\n",["$","p","1708",{"children":[["$","$La",null,{"className":"m-img","id":"$undefined","alt":"prod-snapshots","style":"$undefined","loading":"lazy","src":"https://vip2.loli.io/2023/03/08/LAgy1nSZ9DpQRdj.png","width":261,"height":422,"placeholder":"blur","blurDataURL":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAAFCAIAAAAPE8H1AAAACXBIWXMAABJ0AAASdAHeZh94AAAANElEQVR4nGPQN9DPzMx8+vQpAxcPq4uLC5Rla2v74cMHBjFxUWNj46VLlzL4+HgXFRUBWQDB7hKjRFD0BQAAAABJRU5ErkJggg=="}]]}],"\n",["$","$L20","1709",{"id":"检查-workQueue-情况","children":["检查 workQueue 情况"]}],"\n",["$","p","1713",{"children":["用上了",["$","code","1710",{"children":["fastq"]}],"之后情况变成了定时向 queue 中 push 要抓取的 feed。这是检查 queue 长度（任务完成 / 堆积情况）就显得很重要了。受到",["$","code","1711",{"children":["--heapsnapshot-signal"]}],"启发。绑定信号 handler，在接收到信号时 log 队列长度。Demo 实测",["$","code","1712",{"children":["concurrency"]}],"设置在 500 的情况下，默认 40 秒请求 timeout。一轮 queue 清空约用时 3 分钟。"]}],"\n",["$","$L15","1714",{"id":"总结感受","children":["总结感受"]}],"\n",["$","p","1715",{"children":["heapsnapshot 是分析内存占用的利器。但是网上的资料还是比较少，google 的官方文档也也没有讲清楚一些细节。这么走下来好像很轻松，但是不太熟悉这样的分析，实际上花了很长时间才定位出问题。必须要感谢 tg 群友的提点。"]}],"\n",["$","p","1717",{"children":["最后上一幅","$L24","的资源占用图。"]}],"\n",["$","p","1719",{"children":[["$","$La",null,{"className":"m-img","id":"$undefined","alt":"memory-graph.png","style":"$undefined","loading":"lazy","src":"https://vip2.loli.io/2023/03/08/mPBCsE8S5MIcfWX.png","width":482,"height":330,"placeholder":"blur","blurDataURL":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAADCAIAAADUVFKvAAAACXBIWXMAABJ0AAASdAHeZh94AAAAO0lEQVR4nAEwAM//ADRTW2+HjjxZYQ83P8LKzQCSpauqusCSpasPICOGjI8A1t3gzdPX2uDjyMvN2dvcGvQaraweHZcAAAAASUVORK5CYII="}]]}],"\n",["$","p","1720",{"children":["看到这一个阶梯，总算觉得时间没有白费。"]}],"\n",["$","$L1b","1721",{"id":"未来展望","children":["未来展望"]}],"\n",["$","p","1724",{"children":["可能会考虑别的 schedule 的方法而不是统一在一个时间内抓取全部 feed。bot 开始的时候设计就是多个用户订阅同一个 feed 不会多次请求。这当然限制了功能，比如说每个抓取间隔是全局的而不是每个 feed 可调节的。","$L25","则是将",["$","code","1723",{"children":["(feed_id,user_id)"]}],"作为一个超键。提供了更丰富的功能，但是也导致会对多用户订阅同一个 feed 时会发多个请求。"]}],"\n"]}]
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17:["$","a",null,{"href":"https://t.me/NodeRSS_bot","children":["@NodeRSS_bot"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
18:["$","a",null,{"href":"https://m.do.co/c/5d4b9ede7012","children":["digitalocean"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
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1a:["$","a",null,{"href":"https://github.com/sindresorhus/got","children":["got"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
1c:["$","a",null,{"href":"https://developers.google.com/web/tools/chrome-devtools/memory-problems/heap-snapshots?hl=zh-cn#comparison_%E8%A7%86%E5%9B%BE","children":["Google 的官方文档"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
1d:["$","a",null,{"href":"https://www.bitdegree.org/learn/chrome-memory-tab","children":["这篇文章"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
1e:["$","a",null,{"href":"https://github.com/nodejs/node/pull/27133","children":["–heapsnapshot-signal"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
1f:["$","a",null,{"href":"https://github.com/fengkx/NodeRSSBot/blob/4d1ebd1d212a132b16f9f843dbe5a8bfa89a251b/source/utils/fetch.ts#L39","children":["res"],"target":"_blank","rel":"noopener noreferrer external nofollow"}]
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