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PM2 多核心Cluster實作方式分享

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測試的時候發現，機器即使雙核心，CPU使用率仍然卡在50%上不去，後來才發現原來是PM2只用了一顆核心在跑。

如果要PM2可以跑多核心的執行Thead有一個Cluster模式，但必須要在start的時候下 -i [core number]。如果不確定可以跑多少，可以直接下 -i max，PM2會自動取目前機器最多能執行的Thread數。

舉例來說：
pm2 start -i max index.js --no-automation --name [app name]

pm2 status
可得到下圖兩個Cluster：



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