Linux shell for multi-process

As a database DBA for Linux systems operations or Linux, there are many times when you need to write scripts to help us achieve some of the requirements, and if some content within the script can try parallel processing, it will greatly improve the speed of the work.

Not much to say, on the script

Let's start with an example of sequential execution:

[email protected] test]# cat test.sh

#!/bin/bash

For i in {1..5};d o

Sleep 1; echo "Hello"

Done

[[Email protected] test]# time SH test.sh

Hello

Hello

Hello

Hello

Hello

Real0m5.016s

User0m0.001s

SYS0m0.001s

The time spent here is 5.016s.

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A simple improvement

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[email protected] test]# cat test.sh

#!/bin/bash

For i in {1..5};d o

{

Sleep 1; echo "Hello"

}&

Done

Wait #等待上面的程序结束

[[Email protected] test]# time SH test.sh

Hello

Hello

Hello

Hello

Hello

Real0m1.008s

User0m0.004s

SYS0m0.005s

It takes 1.008 seconds to

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