如何使用bash命令创建CPU峰值

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

2010-05-28 00:46:51

其他回答

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

2015-10-29 19:37:21

如果你不想安装额外的软件，你可以使用自动利用所有CPU内核的压缩工具。例如，xz: