我想在Linux机器上创建一个接近100%的负载。这是四核系统，我要所有核都全速运转。理想情况下，CPU负载将持续一段指定的时间，然后停止。我希望bash里有什么妙招。我在想某种无限循环。
当前回答
我会把它分成两个脚本:
infinite_loop。bash:
#!/bin/bash
while [ 1 ] ; do
# Force some computation even if it is useless to actually work the CPU
echo $((13**99)) 1>/dev/null 2>&1
done
cpu_spike。bash:
#!/bin/bash
# Either use environment variables for NUM_CPU and DURATION, or define them here
for i in `seq ${NUM_CPU}` : do
# Put an infinite loop on each CPU
infinite_loop.bash &
done
# Wait DURATION seconds then stop the loops and quit
sleep ${DURATION}
killall infinite_loop.bash
其他回答
无限循环也是我的想法。一个看起来很怪异的例子是:
while :; do :; done
(:与true相同，不执行任何操作并以0退出)
你可以在子shell中调用它并在后台运行。执行$num_cores次数应该就足够了。在睡眠到所需的时间后，您可以将它们全部杀死，使用jobs -p获得pid(提示:xargs)
利用这里的想法，创建的代码在设定的持续时间后自动退出，不需要杀死进程
#!/bin/bash
echo "Usage : ./killproc_ds.sh 6 60 (6 threads for 60 secs)"
# Define variables
NUM_PROCS=${1:-6} #How much scaling you want to do
duration=${2:-20} # seconds
function infinite_loop {
endtime=$(($(date +%s) + $duration))
while (($(date +%s) < $endtime)); do
#echo $(date +%s)
echo $((13**99)) 1>/dev/null 2>&1
$(dd if=/dev/urandom count=10000 status=none| bzip2 -9 >> /dev/null) 2>&1 >&/dev/null
done
echo "Done Stressing the system - for thread $1"
}
echo Running for duration $duration secs, spawning $NUM_PROCS threads in background
for i in `seq ${NUM_PROCS}` ;
do
# Put an infinite loop
infinite_loop $i &
done
我会把它分成两个脚本:
infinite_loop。bash:
#!/bin/bash
while [ 1 ] ; do
# Force some computation even if it is useless to actually work the CPU
echo $((13**99)) 1>/dev/null 2>&1
done
cpu_spike。bash:
#!/bin/bash
# Either use environment variables for NUM_CPU and DURATION, or define them here
for i in `seq ${NUM_CPU}` : do
# Put an infinite loop on each CPU
infinite_loop.bash &
done
# Wait DURATION seconds then stop the loops and quit
sleep ${DURATION}
killall infinite_loop.bash
你也可以
dd if=/dev/zero of=/dev/null
要运行更多这样的程序，将负载放在更多的内核上，请尝试fork:
fulload() { dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null & }; fulload; read; killall dd
重复花括号中的命令的次数与您想要生成的线程数相同(这里是4个线程)。 简单的输入hit将停止它(只要确保没有其他dd在这个用户上运行，否则也会杀死它)。
#!/bin/bash
while [ 1 ]
do
#Your code goes here
done
