2020-11-06: go, let's talk about the scheduler.

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Fogo's answer 2020-11-06：
·MPG Model ：goroutine The concurrency model of can be summarized as MPG Model ;
·MPG Concept ： Threads （machine, System threads , Physical threads ）- kernel (processor)- coroutines （goroutine, User threads , Logical threads ）;
· Many to many scheduling model ： The overall scheduling follows the many to many model , Multiple collaborations （ About a million ） Scheduling in multiple threads at the same time （ About a thousand ） Next ;
·LRQ（LocalRunningQueue）： Local run queue , One M Execute in a P In the context of ,P There is a G queue ;
·GRQ（GlobalRunningQueue）： Global run queue ,G Not initialized or not LRQ When it's ready to mount, it's thrown in GRQ;
·GRQ=>LRQ：MP Will be in LRQ Check after execution GRQ, And steal the task from it and mount it to the current LRQ In the implementation of , They also have regular checks ;
· The purpose of scheduling is ： The purpose of scheduling is to prevent thread blocking 、 idle 、 By OS Hang up （syscall）;
· Prevent threads M jam ：G1 coroutines IO When you leave MP,G2 From the current MP Of LRQ Pop up and execute ;
· Prevent threads M idle ：M1 When idle , From M2 Of LRQ To steal half of the mission , Mount to your own LRQ In the implementation of ;
· Prevent threads M By OS Hang up （syscall）：P With LRQ Hang to the bottom of other threads to execute , When syscall At the end ,M Will try to G0 Mount to other LRQ Medium or GRQ in ;

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detailed go Scheduler model reference ：
Go Chinese language network ：https://studygolang.com/articles/9610
Simple books ：https://www.jianshu.com/p/f9024e250ac6