I have created a script to stress the cpu, vm and io of a virtual machine and write the results to a file. I have written the script in such a way that it will read user input for how long in seconds they would like to run each test. However, I have had to hard code the number of cpus etc as 4. How can I change this script so that the user can select how many cpu/vm/io to stress in addition to how long?
The script is as follows:
#!/bin/bash
#
# Script to get stress statistics#
echo "Enter the number of intervals (seconds) for running the stress statistics:"
read seconds_to_run
# the variable "seconds_to_run" now has the value entered by keyboard
# The stress option chosen will be output to the corresponding file and timestamped with today's date.
out_cpufilename="/tmp/stress_cpu_stat_"$( date +"%B.%d" )
out_vmfilename="/tmp/stress_vm_stat_"$( date +"%B.%d" )
out_iofilename="/tmp/stress_io_stat_"$( date +"%B.%d" )
while true; do
clear
echo "*******************************"
echo "* Choose from the following: *"
echo "*******************************"
echo "* [1] To stress cpu statistics *"
echo "* [2] To view stress vm statistics *"
echo "* [3] To view stress io statistics *"
echo "Press A to quit."
echo "************************"
echo -n "Enter your menu choice [1-3]: "
read choice
case $choice in
1) echo "stress cpu statistics"
stress -c 4 -t $choice |tee $out_cpufilename
echo "This file will be saved to $out_cpufilename"
sleep 3 ;;
2) echo "stress cpu statistics"
stress -m 4 -t $choice |tee $out_vmfilename
echo "This file will be saved to $out_vmfilename"
sleep 3 ;;
3) echo "stress cpu statistics"
stress -i 4 -t $choice |tee $out_iofilename
echo "This file will be saved to $out_iofilename"
sleep 3 ;;
A) #Quit option
echo You have chosen to quit.
exit;;
*) #Wildcard option in case user enters an invalid option such as "e"
echo Invalid choice, please make another choice
sleep 3;;
esac
done
grep -c ^processor /proc/cpuinfo
将为您提供机器拥有的核心数量
You just need to read the number of cores into a variable:
echo -n "Number of cores: "
read cores
Add this at the position you find most suitable. To use the variable instead of the hard coded values, replace each occurence of 4
with "$cores"
.
A small hint in case you choose to turn your back on Java and become a Bash enthusiast: In order to avoid typical problems with spaces and special characters, it is a best practice to always enclose bash variables in quotes ( "$cores"
) or curly braces ( ${cores}
).
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