From 87a5dfb18b6139a444d6315a9c7fa1a2dcfee875 Mon Sep 17 00:00:00 2001 From: DarkSun Date: Wed, 30 Oct 2019 00:51:34 +0800 Subject: [PATCH] =?UTF-8?q?=E9=80=89=E9=A2=98:=2020191030=20How=20to=20Fin?= =?UTF-8?q?d=20Out=20Top=20Memory=20Consuming=20Processes=20in=20Linux?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit sources/tech/20191030 How to Find Out Top Memory Consuming Processes in Linux.md --- ...Top Memory Consuming Processes in Linux.md | 218 ++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 sources/tech/20191030 How to Find Out Top Memory Consuming Processes in Linux.md diff --git a/sources/tech/20191030 How to Find Out Top Memory Consuming Processes in Linux.md b/sources/tech/20191030 How to Find Out Top Memory Consuming Processes in Linux.md new file mode 100644 index 0000000000..9e30fad132 --- /dev/null +++ b/sources/tech/20191030 How to Find Out Top Memory Consuming Processes in Linux.md @@ -0,0 +1,218 @@ +[#]: collector: (lujun9972) +[#]: translator: ( ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How to Find Out Top Memory Consuming Processes in Linux) +[#]: via: (https://www.2daygeek.com/linux-find-top-memory-consuming-processes/) +[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) + +How to Find Out Top Memory Consuming Processes in Linux +====== + +You may have seen your system consumes too much of memory many times. + +If that’s the case, what would be the best thing you can do to identify processes that consume too much memory on a Linux machine. + +I believe, you may have run one of the below commands to check it out. + +If not, what is the other commands you tried? + +I would request you to update it in the comment section, it may help other users. + +This can be easily identified using the **[top command][1]** and the **[ps command][2]**. + +I used to check both commands simultaneously, and both were given the same result. + +So i suggest you to use one of the command that you like. + +### 1) How to Find Top Memory Consuming Process in Linux Using the ps Command + +The ps command is used to report a snapshot of the current processes. The ps command stands for process status. + +This is a standard Linux application that looks for information about running processes on a Linux system. + +It is used to list the currently running processes and their process ID (PID), process owner name, process priority (PR), and the absolute path of the running command, etc,. + +The below ps command format provides you more information about top memory consumption process. + +``` +# ps aux --sort -rss | head + +USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND +mysql 1064 3.2 5.4 886076 209988 ? Ssl Oct25 62:40 /usr/sbin/mysqld +varnish 23396 0.0 2.9 286492 115616 ? SLl Oct25 0:42 /usr/sbin/varnishd -P /var/run/varnish.pid -f /etc/varnish/default.vcl -a :82 -T 127.0.0.1:6082 -S /etc/varnish/secret -s malloc,256M +named 1105 0.0 2.7 311712 108204 ? Ssl Oct25 0:16 /usr/sbin/named -u named -c /etc/named.conf +nobody 23377 0.2 2.3 153096 89432 ? S Oct25 4:35 nginx: worker process +nobody 23376 0.1 2.1 147096 83316 ? S Oct25 2:18 nginx: worker process +root 23375 0.0 1.7 131028 66764 ? Ss Oct25 0:01 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf +nobody 23378 0.0 1.6 130988 64592 ? S Oct25 0:00 nginx: cache manager process +root 1135 0.0 0.9 86708 37572 ? S 05:37 0:20 cwpsrv: worker process +root 1133 0.0 0.9 86708 37544 ? S 05:37 0:05 cwpsrv: worker process +``` + +Use the below ps command format to include only specific information about the process of memory consumption in the output. + +``` +# ps -eo pid,ppid,%mem,%cpu,cmd --sort=-%mem | head + + PID PPID %MEM %CPU CMD + 1064 1 5.4 3.2 /usr/sbin/mysqld +23396 23386 2.9 0.0 /usr/sbin/varnishd -P /var/run/varnish.pid -f /etc/varnish/default.vcl -a :82 -T 127.0.0.1:6082 -S /etc/varnish/secret -s malloc,256M + 1105 1 2.7 0.0 /usr/sbin/named -u named -c /etc/named.conf +23377 23375 2.3 0.2 nginx: worker process +23376 23375 2.1 0.1 nginx: worker process + 3625 977 1.9 0.0 /usr/local/bin/php-cgi /home/daygeekc/public_html/index.php +23375 1 1.7 0.0 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf +23378 23375 1.6 0.0 nginx: cache manager process + 1135 3034 0.9 0.0 cwpsrv: worker process +``` + +If you want to see only 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=-%mem | head + + PID PPID %MEM %CPU COMMAND + 1064 1 5.4 3.2 mysqld +23396 23386 2.9 0.0 cache-main + 1105 1 2.7 0.0 named +23377 23375 2.3 0.2 nginx +23376 23375 2.1 0.1 nginx +23375 1 1.7 0.0 nginx +23378 23375 1.6 0.0 nginx + 1135 3034 0.9 0.0 cwpsrv + 1133 3034 0.9 0.0 cwpsrv +``` + +### 2) How to Find Out Top Memory Consuming 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. + +It displays a real-time view of the system process running on the interactive interface. + +But if you want to find top memory consuming process then **[use the top command in the batch mode][3]**. + +You should properly **[understand the top command output][4]** to fix the performance issue in system. + +``` +# top -c -b -o +%MEM | head -n 20 | tail -15 + + PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND + 1064 mysql 20 0 886076 209740 8388 S 0.0 5.4 62:41.20 /usr/sbin/mysqld +23396 varnish 20 0 286492 115616 83572 S 0.0 3.0 0:42.24 /usr/sbin/varnishd -P /var/run/varnish.pid -f /etc/varnish/default.vcl -a :82 -T 127.0.0.1:6082 -S /etc/varnish/secret -s malloc,256M + 1105 named 20 0 311712 108204 2424 S 0.0 2.8 0:16.41 /usr/sbin/named -u named -c /etc/named.conf +23377 nobody 20 0 153240 89432 2432 S 0.0 2.3 4:35.74 nginx: worker process +23376 nobody 20 0 147096 83316 2416 S 0.0 2.1 2:18.09 nginx: worker process +23375 root 20 0 131028 66764 1616 S 0.0 1.7 0:01.07 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf +23378 nobody 20 0 130988 64592 592 S 0.0 1.7 0:00.51 nginx: cache manager process + 1135 root 20 0 86708 37572 2252 S 0.0 1.0 0:20.18 cwpsrv: worker process + 1133 root 20 0 86708 37544 2212 S 0.0 1.0 0:05.94 cwpsrv: worker process + 3034 root 20 0 86704 36740 1452 S 0.0 0.9 0:00.09 cwpsrv: master process /usr/local/cwpsrv/bin/cwpsrv + 1067 nobody 20 0 1356200 31588 2352 S 0.0 0.8 0:56.06 /usr/local/apache/bin/httpd -k start + 977 nobody 20 0 1356088 31268 2372 S 0.0 0.8 0:30.44 /usr/local/apache/bin/httpd -k start + 968 nobody 20 0 1356216 30544 2348 S 0.0 0.8 0:19.95 /usr/local/apache/bin/httpd -k start +``` + +If you only want to see the command name instead of the absolute path of the command, use the below top command format. + +``` +# top -b -o +%MEM | head -n 20 | tail -15 + + PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND + 1064 mysql 20 0 886076 210340 8388 S 6.7 5.4 62:40.93 mysqld +23396 varnish 20 0 286492 115616 83572 S 0.0 3.0 0:42.24 cache-main + 1105 named 20 0 311712 108204 2424 S 0.0 2.8 0:16.41 named +23377 nobody 20 0 153240 89432 2432 S 13.3 2.3 4:35.74 nginx +23376 nobody 20 0 147096 83316 2416 S 0.0 2.1 2:18.09 nginx +23375 root 20 0 131028 66764 1616 S 0.0 1.7 0:01.07 nginx +23378 nobody 20 0 130988 64592 592 S 0.0 1.7 0:00.51 nginx + 1135 root 20 0 86708 37572 2252 S 0.0 1.0 0:20.18 cwpsrv + 1133 root 20 0 86708 37544 2212 S 0.0 1.0 0:05.94 cwpsrv + 3034 root 20 0 86704 36740 1452 S 0.0 0.9 0:00.09 cwpsrv + 1067 nobody 20 0 1356200 31588 2352 S 0.0 0.8 0:56.04 httpd + 977 nobody 20 0 1356088 31268 2372 S 0.0 0.8 0:30.44 httpd + 968 nobody 20 0 1356216 30544 2348 S 0.0 0.8 0:19.95 httpd +``` + +### 3) Bonus Tips: How to Find Out Top Memory Consuming Process in Linux Using the ps_mem Command + +The **[ps_mem utility][5]** is used to display the core memory used per program (not per process). + +This utility allows you to check how much memory is used per program. + +It calculates the amount of private and shared memory against a program and returns the total used memory in the most appropriate way. + +It uses the following logic to calculate RAM usage. Total RAM = sum (private RAM for program processes) + sum (shared RAM for program processes) + +``` +# ps_mem + + Private + Shared = RAM used Program +128.0 KiB + 27.5 KiB = 155.5 KiB agetty +228.0 KiB + 47.0 KiB = 275.0 KiB atd +284.0 KiB + 53.0 KiB = 337.0 KiB irqbalance +380.0 KiB + 81.5 KiB = 461.5 KiB dovecot +364.0 KiB + 121.5 KiB = 485.5 KiB log +520.0 KiB + 65.5 KiB = 585.5 KiB auditd +556.0 KiB + 60.5 KiB = 616.5 KiB systemd-udevd +732.0 KiB + 48.0 KiB = 780.0 KiB crond +296.0 KiB + 524.0 KiB = 820.0 KiB avahi-daemon (2) +772.0 KiB + 51.5 KiB = 823.5 KiB systemd-logind +940.0 KiB + 162.5 KiB = 1.1 MiB dbus-daemon + 1.1 MiB + 99.0 KiB = 1.2 MiB pure-ftpd + 1.2 MiB + 100.5 KiB = 1.3 MiB master + 1.3 MiB + 198.5 KiB = 1.5 MiB pickup + 1.3 MiB + 198.5 KiB = 1.5 MiB bounce + 1.3 MiB + 198.5 KiB = 1.5 MiB pipe + 1.3 MiB + 207.5 KiB = 1.5 MiB qmgr + 1.4 MiB + 198.5 KiB = 1.6 MiB cleanup + 1.3 MiB + 299.5 KiB = 1.6 MiB trivial-rewrite + 1.5 MiB + 145.0 KiB = 1.6 MiB config + 1.4 MiB + 291.5 KiB = 1.6 MiB tlsmgr + 1.4 MiB + 308.5 KiB = 1.7 MiB local + 1.4 MiB + 323.0 KiB = 1.8 MiB anvil (2) + 1.3 MiB + 559.0 KiB = 1.9 MiB systemd-journald + 1.8 MiB + 240.5 KiB = 2.1 MiB proxymap + 1.9 MiB + 322.5 KiB = 2.2 MiB auth + 2.4 MiB + 88.5 KiB = 2.5 MiB systemd + 2.8 MiB + 458.5 KiB = 3.2 MiB smtpd + 2.9 MiB + 892.0 KiB = 3.8 MiB bash (2) + 3.3 MiB + 555.5 KiB = 3.8 MiB NetworkManager + 4.1 MiB + 233.5 KiB = 4.3 MiB varnishd + 4.0 MiB + 662.0 KiB = 4.7 MiB dhclient (2) + 4.3 MiB + 623.5 KiB = 4.9 MiB rsyslogd + 3.6 MiB + 1.8 MiB = 5.5 MiB sshd (3) + 5.6 MiB + 431.0 KiB = 6.0 MiB polkitd + 13.0 MiB + 546.5 KiB = 13.6 MiB tuned + 22.5 MiB + 76.0 KiB = 22.6 MiB lfd - sleeping + 30.0 MiB + 6.2 MiB = 36.2 MiB php-fpm (6) + 5.7 MiB + 33.5 MiB = 39.2 MiB cwpsrv (3) + 20.1 MiB + 25.3 MiB = 45.4 MiB httpd (5) +104.7 MiB + 156.0 KiB = 104.9 MiB named +112.2 MiB + 479.5 KiB = 112.7 MiB cache-main + 69.4 MiB + 58.6 MiB = 128.0 MiB nginx (4) +203.4 MiB + 309.5 KiB = 203.7 MiB mysqld +--------------------------------- + 775.8 MiB +================================= +``` + +-------------------------------------------------------------------------------- + +via: https://www.2daygeek.com/linux-find-top-memory-consuming-processes/ + +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-top-command-linux-system-performance-monitoring-tool/ +[2]: https://www.2daygeek.com/linux-ps-command-find-running-process-monitoring/ +[3]: https://www.2daygeek.com/linux-run-execute-top-command-in-batch-mode/ +[4]: https://www.2daygeek.com/understanding-linux-top-command-output-usage/ +[5]: https://www.2daygeek.com/ps_mem-report-core-memory-usage-accurately-in-linux/