bash控制任务并发数脚本

bash控制任务并发数脚本

使用bash实现控制任务并发数的功能

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#!/bin/bash
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#
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CMDS[1]="echo $USER' 01 BEGIN' && sleep 6 && echo $USER' 01 END'"
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CMDS[2]="echo $USER' 02 BEGIN' && sleep 3 && echo $USER' 02 END'"
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CMDS[3]="echo $USER' 03 BEGIN' && sleep 7 && echo $USER' 03 END'"
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CMDS[4]="echo $USER' 04 BEGIN' && sleep 4 && echo $USER' 04 END'"
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CMDS[5]="echo $USER' 05 BEGIN' && sleep 2 && echo $USER' 05 END'"
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CMDS[6]="echo $USER' 06 BEGIN' && sleep 5 && echo $USER' 06 END'"
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N=${#CMDS[@]}
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MAX=3
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PIDS=''
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for I in $(seq $N)
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do
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    while [ 1 -gt 0 ]
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    do
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        C=0
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        pids=''
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        for PID in $PIDS
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        do
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            ps $PID >/dev/null 2>/dev/null
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            if [ $? -eq 0 ]
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            then
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                pids="$pids $PID"
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                (( C = C + 1 ))
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            fi
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        done
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        PIDS=$pids
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        [ $C -lt $MAX ] && break
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        sleep 1
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    done
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    #echo $i ${CMDS[$i]}
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    CMD=${CMDS[$I]}
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    bash -c "$CMD" &
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    PIDS="$PIDS $!"
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done
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wait