zoukankan      html  css  js  c++  java
  • shell 多线程

    实测发现也就那样,在有sleep的时候确实比for循环快,但是把sleep 去掉就没有for快了,真垃圾,根据场景选择

    real    1m53.050s
    user    0m0.589s
    sys    0m1.061s
    [root@localhost ~]# time for i in `seq 1 100`;do curl -s -I "http://www.baidu.com/"|wc -l;sleep 1; done
    #!/bin/bash
    THREAD_NUM=5
    TMP_FILE="/tmp/$$.fifo"
    
    trap "exec 6>&-;exec 6<&-;exit 0" 2    
    
    mkfifo ${TMP_FILE}  
    exec 6<>${TMP_FILE} 
    rm -rf ${TMP_FILE}
     
    for ((J=1;J<=${THREAD_NUM};J++)) 
    do
        echo >&6
    done
    
    localfunc(){
       #echo "${I}: success" 
       curl -s -I "http://www.baidu.com/"|wc -l
       sleep 1
    }
    
    for ((I=1;I<=100;I++))
    do 
        read -u6 
        {
            #echo "${I}: success" ; sleep 1
            localfunc
            echo >&6    
        }&
    done
    wait
    
     
    exec 6>&-
    exec 6<&-
    
    
    
    real	0m24.407s
    user	0m0.576s
    sys	0m1.059s
    time sh shss.sh
    

     

    参考:https://www.dazhuanlan.com/realpanda/topics/978898

    https://www.cnblogs.com/old-path-white-cloud/p/11685558.html

  • 相关阅读:
    WebServices Get
    字符出现次数
    正则
    防止AutoPost
    转双问号,单问号
    GetData
    UpdatePanel
    字居中
    C# 面向对象之多态
    C# 委托之把委托从委托链(多播委托)移除
  • 原文地址:https://www.cnblogs.com/bill2014/p/15578337.html
Copyright © 2011-2022 走看看