msb-public-java
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LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
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update

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pull/6/head
yuanguangxin 5 years ago
parent 95460a11c9
commit 4b28b6580f
2 changed files with 23 additions and 17 deletions
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36
.idea/workspace.xml
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4
Rocket.md
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@ -719,6 +719,10 @@ Kafka最初考虑的问题是，customer应该从brokes拉取消息还是brokers
4. 进程间不会相互影响，一个线程挂掉将导致整个进程挂掉。
5. 系统在运行的时候会为每个进程分配不同的内存空间；而对线程而言，除了CPU外，系统不会为线程分配内存（线程所使用的资源来自其所属进程的资源），线程组之间只能共享资源。
### 多线程和单线程
线程不是越多越好，假如你的业务逻辑全部是计算型的（CPU密集型）,不涉及到IO，并且只有一个核心。那肯定一个线程最好，多一个线程就多一点线程切换的计算，CPU不能完完全全的把计算能力放在业务计算上面，线程越多就会造成CPU利用率（用在业务计算的时间/总的时间）下降。但是在WEB场景下，业务并不是CPU密集型任务，而是IO密集型的任务，一个线程是不合适，如果一个线程在等待数据时，把CPU的计算能力交给其他线程，这样也能充分的利用CPU资源。但是线程数量也要有个限度，一般线程数有一个公式：最佳启动线程数=[任务执行时间/(任务执行时间-IO等待时间)]*CPU内核数超过这个数量，CPU要进行多余的线程切换从而浪费计算能力，低于这个数量，CPU要进行IO等待从而造成计算能力不饱和。总之就是要尽可能的榨取CPU的计算能力。如果你的CPU处于饱和状态，并且没有多余的线程切换浪费，那么此时就是你服务的完美状态，如果再加大并发量，势必会造成性能上的下降。
### 进程的组成部分
进程由进程控制块（PCB）、程序段、数据段三部分组成。

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