diff --git a/sources/tech/20191211 How to Find High CPU Consumption Processes in Linux.md b/sources/tech/20191211 How to Find High CPU Consumption Processes in Linux.md new file mode 100644 index 0000000000..1e628a04b4 --- /dev/null +++ b/sources/tech/20191211 How to Find High CPU Consumption Processes in Linux.md @@ -0,0 +1,196 @@ +[#]: collector: (lujun9972) +[#]: translator: ( ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How to Find High CPU Consumption Processes in Linux) +[#]: via: (https://www.2daygeek.com/how-to-find-high-cpu-consumption-processes-in-linux/) +[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) + +How to Find High CPU Consumption Processes in Linux +====== + +We have already described in our previous article **[how to find high memory consumption processes in Linux][1]**. + +There are situations where you might see more CPU usage on a Linux system. + +If so, you should identify a list of processes that consume more CPU on the system. + +I believe there are only two ways for you to check this. + +This can be done using the **[top command][2]** and the **[ps command][3]**. + +I’d like to go with the top command for most reasons instead of ps. + +But both will give you the same results, so you can choose the one you like. + +Both of these options are widely used by Linux administrators. + +### 1) How to Find High CPU Consumption Process in Linux Using the top Command + +The Linux top command is the best and most well known command that everyone uses to monitor Linux system performance. + +The top command provides a dynamic real-time view of the running process on a Linux system. + +It display system summary information, the list of processes currently being managed by the Linux kernel. + +It displays various system information such as CPU usage, Memory usage, Swap Memory, Number of running processes, system uptime, system load, Buffer Size, Cache Size, Process PID, etc. + +By default, it sorts the top output with the CPU usage and updates the top command data every 5 seconds. + +If you want to see a clear view of the top command output for further analysis, this is a best way to **[run the top command in the batch mode][4]**. + +Also, you need to **[understand the top command output][5]** to fix the performance problem on the system. + +``` +# top -c -b | head -50 + +top - 00:19:17 up 14:23, 1 user, load average: 2.46, 2.18, 1.97 +Tasks: 306 total, 1 running, 305 sleeping, 0 stopped, 0 zombie +%Cpu0 : 10.4 us, 3.0 sy, 0.0 ni, 83.9 id, 0.0 wa, 1.3 hi, 1.3 si, 0.0 st +%Cpu1 : 17.0 us, 3.0 sy, 0.0 ni, 78.7 id, 0.0 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu2 : 13.0 us, 4.0 sy, 0.0 ni, 81.3 id, 0.0 wa, 0.3 hi, 1.3 si, 0.0 st +%Cpu3 : 12.3 us, 3.3 sy, 0.0 ni, 82.5 id, 0.3 wa, 0.7 hi, 1.0 si, 0.0 st +%Cpu4 : 12.2 us, 3.0 sy, 0.0 ni, 82.8 id, 0.7 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu5 : 6.4 us, 2.7 sy, 0.0 ni, 89.2 id, 0.0 wa, 0.7 hi, 1.0 si, 0.0 st +%Cpu6 : 26.7 us, 3.4 sy, 0.0 ni, 68.6 id, 0.0 wa, 0.7 hi, 0.7 si, 0.0 st +%Cpu7 : 15.6 us, 4.0 sy, 0.0 ni, 78.8 id, 0.0 wa, 0.7 hi, 1.0 si, 0.0 st +KiB Mem : 16248556 total, 1448920 free, 8571484 used, 6228152 buff/cache +KiB Swap: 17873388 total, 17873388 free, 0 used. 4596044 avail Mem +PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND + 2179 daygeek 20 3106324 613584 327564 S 79.5 3.8 14:19.76 Web Content + 1714 daygeek 20 4603372 974600 403504 S 20.2 6.0 65:18.91 firefox + 1227 daygeek 20 4192012 376332 180348 S 13.9 2.3 20:43.26 gnome-shell +18324 daygeek 20 3296192 766040 127948 S 6.3 4.7 9:18.12 Web Content + 1170 daygeek 20 1008264 572036 546180 S 6.0 3.5 18:07.85 Xorg + 4684 daygeek 20 3363708 1.1g 1.0g S 3.6 7.2 13:49.92 VirtualBoxVM + 4607 daygeek 20 4591040 1.7g 1.6g S 3.0 11.0 14:09.65 VirtualBoxVM + 1211 daygeek 9 -11 2865268 21032 16588 S 2.0 0.1 10:46.37 pulseaudio + 4562 daygeek 20 1096888 28812 21044 S 1.7 0.2 4:42.93 VBoxSVC + 1783 daygeek 20 3123888 376896 134788 S 1.3 2.3 39:32.56 Web Content + 3286 daygeek 20 3089736 404088 184968 S 1.0 2.5 41:57.44 Web Content +``` + +Details of the above command: + + * **top :** This is a command. + * **-b :** Batch mode. + * **head -50:** Display first 50 lines in the output. + * **PID :** Unique ID of the process. + * **USER :** Owner of the process. + * **PR :** priority of the process. + * **NI :** The NICE value of the process. + * **VIRT :** How much virtual memory used by the process. + * **RES :** How much physical memory used by the process. + * **SHR :** How much shared memory used by the process. + * **S :** This indicates the status of the process: S=sleep R=running Z=zombie. + * **%CPU :** The percentage of CPU used by the process. + * **%MEM :** The percentage of RAM used by the process. + * **TIME+ :** How long the process being running. + * **COMMAND :** Name of the process. + + + +If you want to see the full path of the command instead of the command name, run the following top command format. + +``` +# top -b | head -50 + +top - 00:28:49 up 14:33, 1 user, load average: 2.43, 2.49, 2.23 +Tasks: 305 total, 1 running, 304 sleeping, 0 stopped, 0 zombie +%Cpu0 : 11.7 us, 3.7 sy, 0.0 ni, 82.3 id, 0.0 wa, 1.0 hi, 1.3 si, 0.0 st +%Cpu1 : 13.6 us, 3.3 sy, 0.0 ni, 81.1 id, 0.7 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu2 : 10.9 us, 2.6 sy, 0.0 ni, 85.1 id, 0.0 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu3 : 16.0 us, 2.6 sy, 0.0 ni, 80.1 id, 0.0 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu4 : 9.2 us, 3.6 sy, 0.0 ni, 85.9 id, 0.0 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu5 : 15.6 us, 2.9 sy, 0.0 ni, 80.5 id, 0.0 wa, 0.3 hi, 0.7 si, 0.0 st +%Cpu6 : 11.6 us, 4.3 sy, 0.0 ni, 82.7 id, 0.0 wa, 0.3 hi, 1.0 si, 0.0 st +%Cpu7 : 8.0 us, 3.0 sy, 0.0 ni, 87.3 id, 0.0 wa, 0.7 hi, 1.0 si, 0.0 st +KiB Mem : 16248556 total, 1022456 free, 8778508 used, 6447592 buff/cache +KiB Swap: 17873388 total, 17873388 free, 0 used. 4201560 avail Mem +PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND +18527 daygeek 20 3151820 624808 325748 S 52.8 3.8 59:26.72 /usr/lib/firefox/firefox -contentproc -childID 18 -isForBrowser -prefsLen 10002 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /+ + 1714 daygeek 20 4764668 910940 443228 S 21.5 5.6 68:59.33 /usr/lib/firefox/firefox --new-window + 1227 daygeek 20 4193108 377344 181404 S 11.6 2.3 21:47.36 /usr/bin/gnome-shell + 1170 daygeek 20 1008820 572700 546844 S 5.6 3.5 19:05.10 /usr/lib/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3 +18324 daygeek 20 3300288 789344 127948 S 5.0 4.9 9:46.89 /usr/lib/firefox/firefox -contentproc -childID 16 -isForBrowser -prefsLen 10002 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /+ + 4684 daygeek 20 3363708 1.1g 1.0g S 3.6 7.2 14:10.18 /usr/lib/virtualbox/VirtualBoxVM --comment CentOS7 --startvm 002f47b8-2af2-48f5-be1d-67b67e03514c --no-startvm-errormsgbox + 4607 daygeek 20 4591040 1.7g 1.6g S 3.0 11.0 14:28.86 /usr/lib/virtualbox/VirtualBoxVM --comment Ubuntu-18.04 --startvm e8c32dbb-8b01-41b0-977a-bf28b9db1117 --no-startvm-errormsgbox + 1783 daygeek 20 3132640 451924 132168 S 2.6 2.8 39:49.66 /usr/lib/firefox/firefox -contentproc -childID 1 -isForBrowser -prefsLen 1 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/l+ + 1211 daygeek 9 -11 2865268 21272 16828 S 2.0 0.1 11:01.29 /usr/bin/pulseaudio --daemonize=no + 4562 daygeek 20 1096888 28812 21044 S 1.7 0.2 4:49.33 /usr/lib/virtualbox/VBoxSVC --auto-shutdown +16865 daygeek 20 3073364 430596 124652 S 1.3 2.7 8:04.02 /usr/lib/firefox/firefox -contentproc -childID 15 -isForBrowser -prefsLen 10002 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /+ + 2179 daygeek 20 2945348 429644 172940 S 1.0 2.6 15:20.90 /usr/lib/firefox/firefox -contentproc -childID 6 -isForBrowser -prefsLen 7821 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /us+ +``` + +### 2) How to Find High CPU Consumption Process in Linux Using the ps Command + +ps stands for processes status, it display the information about the active/running processes on the system. + +It provides a snapshot of the current processes along with detailed information like username, user id, cpu usage, memory usage, process start date and time command name etc. + +``` +# ps -eo pid,ppid,%mem,%cpu,cmd --sort=-%cpu | head + + PID PPID %MEM %CPU CMD +18527 1714 4.2 40.3 /usr/lib/firefox/firefox -contentproc -childID 18 -isForBrowser -prefsLen 10002 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1714 true tab + 1714 1152 5.6 8.0 /usr/lib/firefox/firefox --new-window +18324 1714 4.9 6.3 /usr/lib/firefox/firefox -contentproc -childID 16 -isForBrowser -prefsLen 10002 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1714 true tab + 3286 1714 2.0 5.1 /usr/lib/firefox/firefox -contentproc -childID 14 -isForBrowser -prefsLen 8078 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1714 true tab + 1783 1714 3.0 4.5 /usr/lib/firefox/firefox -contentproc -childID 1 -isForBrowser -prefsLen 1 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1714 true tab + 1227 1152 2.3 2.5 /usr/bin/gnome-shell + 1170 1168 3.5 2.2 /usr/lib/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3 +16865 1714 2.5 2.1 /usr/lib/firefox/firefox -contentproc -childID 15 -isForBrowser -prefsLen 10002 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1714 true tab + 2179 1714 2.7 1.8 /usr/lib/firefox/firefox -contentproc -childID 6 -isForBrowser -prefsLen 7821 -prefMapSize 213431 -parentBuildID 20191031132559 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1714 true tab +``` + +Details of the above command: + + * **ps :** This is a command. + * **-e :** Select all processes. + * **-o :** To customize a output format. + * **–sort=-%cpu :** Sort the ouput based on CPU usage. + * **head :** To display first 10 lines of the output + * **PID :** Unique ID of the process. + * **PPID :** Unique ID of the parent process. + * **%MEM :** The percentage of RAM used by the process. + * **%CPU :** The percentage of CPU used by the process. + * **Command :** Name of the process. + + + +If you only want to see the command name instead of the absolute path of the command, use the ps command format below. + +``` +# ps -eo pid,ppid,%mem,%cpu,comm --sort=-%cpu | head + + PID PPID %MEM %CPU COMMAND +18527 1714 4.1 40.4 Web Content + 1714 1152 5.7 8.0 firefox +18324 1714 4.9 6.3 Web Content + 3286 1714 2.0 5.1 Web Content + 1783 1714 3.0 4.5 Web Content + 1227 1152 2.3 2.5 gnome-shell + 1170 1168 3.5 2.2 Xorg +16865 1714 2.4 2.1 Web Content + 2179 1714 2.7 1.8 Web Content +``` + +-------------------------------------------------------------------------------- + +via: https://www.2daygeek.com/how-to-find-high-cpu-consumption-processes-in-linux/ + +作者：[Magesh Maruthamuthu][a] +选题：[lujun9972][b] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://www.2daygeek.com/author/magesh/ +[b]: https://github.com/lujun9972 +[1]: https://www.2daygeek.com/linux-find-top-memory-consuming-processes/ +[2]: https://www.2daygeek.com/linux-top-command-linux-system-performance-monitoring-tool/ +[3]: https://www.2daygeek.com/linux-ps-command-find-running-process-monitoring/ +[4]: https://www.2daygeek.com/linux-run-execute-top-command-in-batch-mode/ +[5]: https://www.2daygeek.com/understanding-linux-top-command-output-usage/