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  • 测试从应用到DB的准确的网络延迟

    最近几大云厂商把底层的基础设施包装起来后,通过Ping等很难知道真正的网络延迟了,因为通过ping还没到db都返回了,如何知道从应用到db的真正网络延迟呢?

    用我的脚本

    #!/bin/bash
    
    m=1
    db_port=$1
    db_port=$2
    db_user=$3
    db_pass=$4
    
    echo "">res.txt
        t_start=`mysql -h ${db_port} -P ${db_port} -u ${db_user} -p${db_pass}  -N -e"select REPLACE(unix_timestamp(current_timestamp(3)),'.','')"`
    for (( i=1; i < 1000; i++ ))
    do
        { time mysql -h ${db_port} -P ${db_port} -u ${db_user} -p${db_pass} -N -e"select 1" > /dev/null ; } 2>> res.txt
        let "m++"
    done
        t_end=`mysql -h ${db_port} -P ${db_port} -u ${db_user} -p${db_pass} -N -e"select REPLACE(unix_timestamp(current_timestamp(3)),'.','')"`
    
    t_diff=`expr ${t_end} - ${t_start}`
    echo "execute "${t_diff}" milliseconds!"
    
    awk -F"m" '/real/{print $2}' res.txt | awk '{sum+=$1} END {print "real_Sum=",sum/NR}'
    awk -F"m" '/user/{print $2}' res.txt | awk '{sum+=$1} END {print "user_Sum=",sum/NR}'
    awk -F"m" '/sys/{print $2}' res.txt | awk '{sum+=$1} END {print "sys_Sum=",sum/NR}'
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  • 原文地址:https://www.cnblogs.com/sunss/p/11364962.html
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