Linux load average high, Java project
Linux load problems, in daily development, often suffer from us; below to sort out several factors that lead to changes in Linux load.
Case 1: CPU high, Load high
1. Use the top command to find the process PID that occupies the highest CPU;
2. Find the thread TID occupying the highest CPU by top -Hp pid;
3. For java programs, use jstack to print thread stack information;
4. Print out the hexadecimal of the most CPU thread by printf %x tid;
5. View the stack information of the thread in the stack information;
Case 2: CPU low, Load high
1. Use the top command to check the CPU wait IO time, that is, %wa;
2. View disk IO status via iostat -d -x -m 1 10; (sudo apt install sysstat)
3. View network IO status through sar -n DEV 1 10;
ylspirit@ubuntu:~$ sar 3 2
#Exit every 3s, output 2 times
4. Find the program that occupies IO by the linux ps command;
ylspirit@ubuntu:~$ ps -e -L -o stat,cmd,pid | awk -F" " '{if($1=="R+"||$1=="R"||$1=="D"){print $0};if(NR==1) {print $0}}'
Related commands：
- linux ps command and ps example
- linux awk syntax and awk examples
- linux iostat syntax and iostat examples
View linux load average: three ways to view linux load average and load explained
More about Linux commands: Linux Commands Tutorial