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Shell中實現(xiàn)“多線程”執(zhí)行腳本文件完美解決方案

 更新時間:2014年12月23日 10:25:21   投稿:junjie  
這篇文章主要介紹了Shell中實現(xiàn)“多線程”執(zhí)行腳本文件完美解決方案,本文是針對一次調(diào)用執(zhí)行多個腳本文件并分批執(zhí)行的一個解決方法的測試和總結(jié),需要的朋友可以參考下

即比如我有100個可執(zhí)行文件,互相間沒有特別的先后執(zhí)行關(guān)系,如CODE:

復(fù)制代碼 代碼如下:

job_1
job_2
job_2
.....
job_100

想用csh/bash來多線程調(diào)用執(zhí)行。

比如一次開5個線程,那么job_1,2,3,4,5一起先開始,那么其中任何一個線程如果先執(zhí)行完成,則繼續(xù)執(zhí)行下一個沒有初執(zhí)行過的文件,如job_6,7,8....,這樣一直以所指定的線程數(shù)來執(zhí)行所有100個文件。

我本來想用 "&" 來放入后臺,可是這樣我一次可以指定5放入后臺,但是無法知道其中任何一個程序何時執(zhí)行完畢,所以也無法繼續(xù)執(zhí)行下一個程序啊!

完美解決方案:

復(fù)制代碼 代碼如下:

-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; cat job_1
#!/bin/bash
n=$((RANDOM % 5 + 1))
echo "$0 sleeping for $n seconds ..."
sleep $n
echo "$0 exiting ..."
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; for ((i = 2; i <= 10; ++i)); do cp job_1 job_$i; done
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; cat jobs.sh
#!/bin/bash
nParellel=5
nJobs=10
sJobPattern='./job_%d'
aJobs=()
sNextJob=
for ((iNextJob = 1; iNextJob <= nJobs; )); do
    for ((iJob = 0; iJob < nParellel; ++iJob)); do
        if [ $iNextJob -gt $nJobs ]; then
            break;
        fi
        if [ ! "${aJobs[iJob]}" ] || ! kill -0 ${aJobs[iJob]} 2> /dev/null; then
            printf -v sNextJob "$sJobPattern" $((iNextJob++))
            echo "$sNextJob starting ..."
            $sNextJob &
            aJobs[iJob]=$!
        fi
    done
    sleep .1
done
wait
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; ./jobs.sh
./job_1 starting ...
./job_1 sleeping for 3 seconds ...
./job_2 starting ...
./job_2 sleeping for 2 seconds ...
./job_3 starting ...
./job_3 sleeping for 5 seconds ...
./job_4 starting ...
./job_5 starting ...
./job_4 sleeping for 4 seconds ...
./job_5 sleeping for 2 seconds ...
./job_2 exiting ...
./job_6 starting ...
./job_6 sleeping for 2 seconds ...
./job_5 exiting ...
./job_7 starting ...
./job_7 sleeping for 1 seconds ...
./job_1 exiting ...
./job_8 starting ...
./job_8 sleeping for 3 seconds ...
./job_7 exiting ...
./job_9 starting ...
./job_9 sleeping for 5 seconds ...
./job_4 exiting ...
./job_6 exiting ...
./job_10 starting ...
./job_10 sleeping for 5 seconds ...
./job_3 exiting ...
./job_8 exiting ...
./job_9 exiting ...
./job_10 exiting ...
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; bye

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