11 KiB
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 and the ps command.
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.
You should properly understand the top command output 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 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
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via: https://www.2daygeek.com/linux-find-top-memory-consuming-processes/
作者：Magesh Maruthamuthu 选题：lujun9972 译者：lnrCoder 校对：校对者ID