shell的单、多、控制进程的使用方法
一、100个任务使用200秒(普通完成)
cat process2.sh
#!/bin/bash
function aaa ()
{
start=`date "+%s"`
for ((i=1;i<=100;i++))
do
echo test;sleep 2
done
end=`date "+%s"`
echo "time:`expr $end - $start`"
}
aaa
exit 0
================执行结果=================
time:200
real 3m20.338s
user 0m0.032s
sys 0m0.008s
二、100个任务使用2秒(非控制进程完成任务)
cat process1.sh
#!/bin/bash
function aaa ()
{
start=`date "+%s"`
for ((i=1;i<=100;i++))
do
(
echo test;sleep 2
)&
done
wait
end=`date "+%s"`
echo "time:`expr $end - $start`"
}
aaa
exit 0
================执行结果=================
time bash process1.sh
time:2
real 0m2.259s
user 0m0.008s
sys 0m0.020s
三、100个任务使用20秒(控制进程完成任务,生产环境使用)
cat process.sh
function aaa () {
start=`date "+%s"`
for ((i=1;i<=100;i++))
do
(
echo 111;sleep 2
)&
[[ $i%10 -eq 0 ]] && wait
done
wait
end=`date "+%s"`
echo "time:`expr $end - $start`"
}
aaa
exit 0
================执行结果=================
time bash process.sh
time:20
real 0m20.376s
user 0m0.000s
sys 0m0.032s
时间： 2024-12-15 09:53:33