Retrieve CPU usage and memory usage of a single process on Linux

Question

I want to get the CPU and memory usage of a single process on Linux - I know the PID   Hopefully  I can get it every second and write it to a CSV using the  watch  command   What command can I use to get this info from the Linux command-line

User · Accepted Answer

ps -p  lt pid gt  -o  cpu  mem cmd    You can leave off  cmd  but that might be helpful in debugging    Note that this gives average CPU usage of the process over the time it has been running

User · Answer

As commented in caf s answer above  ps and in some cases pidstat will give you the lifetime average of the pCPU  To get more accurate results use top  If you need to run top once you can run   top -b -n 1 -p  lt PID gt    or for process only data and header   top -b -n 1 -p  lt PID gt    tail -3   head -2   without headers   top -b -n 1 -p  lt PID gt    tail -2   head -1

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ps command  should not use      CPU usage is currently expressed as the percentage of time spent running during the entire lifetime of a process    top command  should use      The task s share of the elapsed CPU time since the last screen update  expressed as a percentage of total CPU time    Use top to get CPU usage in real time current short interval    top -b -n 2 -d 0 2 -p 6962   tail -1   awk   print  9    will echo like  78 6   -b  Batch-mode -n 2  Number-of-iterations  use 2 because  When you first run it  it has no previous sample to compare to  so these initial values are the percentages since boot  -d 0 2  Delay-time in second  here is 200ms  -p 6962  Monitor-PIDs tail -1  the last row awk   print  9    the 9-th column the cpu usage number

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A variant of caf s answer  top -p  lt pid gt   This auto-refreshes the CPU usage so it s good for monitoring

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ps aux   awk   print  4  t  11     sort   uniq -c   awk   print  2    1    3     sort -nr   or per process  ps aux   awk   print  4  t  11     sort   uniq -c   awk   print  2    1    3     sort -nr  grep mysql

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To get the memory usage of just your application  as opposed to the shared libraries it uses  you need to use the Linux smaps interface   This answer explains it well

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This is a nice trick to follow one or more programs in real time while also watching some other tool s output      watch  top -bn1 -p  pidof foo    pidof bar   tool

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Above list out the top cpu and memory consuming process          ps axo  cpu  mem command   sort -nr   head

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Launch a program and monitor it  This form is useful if you want to benchmark an executable easily   topp           amp  gt  dev null  amp    pid        trap     INT   echo  CPU  MEM    while sleep 1  do ps --no-headers -o   cpu  mem  -p   pid   done   kill   pid    topp   myprog arg1 arg2   Now when you hit Ctrl   C it exits the program and stops monitoring  Sample output   CPU  MEM 20 0  1 3 35 0  1 3 40 0  1 3   Related  https   unix stackexchange com questions 554 how-to-monitor-cpu-memory-usage-of-a-single-process  Tested on Ubuntu 16 04

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The following command gets the average of CPU and memory usage every 40 seconds for a specific process pid   pidstat 40 -ru -p  lt pid gt    Output for my case first two lines for CPU usage  second two lines for memory    02 15 07 PM       PID     usr  system   guest     CPU   CPU  Command 02 15 47 PM     24563    0 65    0 07    0 00    0 73     3  java  02 15 07 PM       PID  minflt s  majflt s     VSZ    RSS    MEM  Command 02 15 47 PM     24563      6 95      0 00 13047972 2123268   6 52  java

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You can get the results by the name of the process using   ps -C chrome -o  cpu  mem cmd   the -C option allows you to use process name without knowing it s pid

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If you are in MacOS 10 10  try the accumulative -c option of top   top -c a -pid PID    This option is not available in other linux  tried with Scientific Linux el6 and RHEL6

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Use pidstat  from sysstat - Refer Link    e g  to monitor these two process IDs  12345 and 11223  every 5 seconds use    pidstat -h -r -u -v -p 12345 11223 5

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ps aux awk    print  2  3  4   grep PID   where the first column  is the PID second column CPU usage  third column memory usage

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Based on  Neon answer  my two cents here  pidstat -h -r -u -v -p   ps aux   grep  lt process name gt    awk   print  2     tr   n

User · Answer

Based on  caf s answer  this working nicely for me   Calculate average for given PID   measure sh  times 100 total 0 for i in   seq 1  times  do    OUTPUT   top -b -n 1 -d 0 1 -p  1   tail -1   awk   print  9       echo -n   i time    OUTPUT    r    total  echo   total    OUTPUT    bc -l  done  echo  Average   total    times    bc  average  echo  scale 2   total    times    bc  echo  Average   average    Usage     send PID as argument sh measure sh 3282

User · Answer

For those who struggled for a while wonderring why the selected answer does not work   ps -p  lt pid gt  -o  cpu  mem   No SPACE ibetween  cpu  and  mem

User · Answer

CPU and memory usage of a single process on Linux or you can get the top 10 cpu utilized processes by using below command  ps -aux --sort -pcpu   head -n 11

User · Answer

ps axo pid etime  cpu  mem cmd   grep  processname    grep -v grep   PID - Process ID  etime - Process Running Live Duration   cpu - CPU usage   mem - Memory usage  cmd - Command  Replace processname with whatever process you want to track  mysql nginx php-fpm etc

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You could use top -b and grep out the pid you want  with the -b flag top runs in batch mode   or also use the -p flag and specify the pid without using grep

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All of the answers here show only the memory percentage for the PID    Here s an example of how to get the rss memory usage in KB for all apache processes  replace  grep apache  with  grep PID  if you just want to watch a specific PID   watch -n5  ps aux -y   grep apache   awk   print   2   6      This prints   Every 5 0s  ps aux -y   grep apache   awk   print  2  6                                                                                                                                                                                                             Thu Jan 25 15 44 13 2018  12588 9328 12589 8700 12590 9392 12591 9340 12592 8700 12811 15200 15453 9340 15693 3800 15694 2352 15695 1352 15697 948 22896 9360   With CPU     watch -n5  ps aux -y   grep apache   awk   print   2   3   6      Output   Every 5 0s  ps aux -y   grep apache   awk   print  2  3  6                                                                                                                                                                                                          Thu Jan 25 15 46 00 2018  12588 0 0 9328 12589 0 0 8700 12590 0 0 9392 12591 0 0 9340 12592 0 0 8700 12811 0 0 15200 15453 0 0 9340 15778 0 0 3800 15779 0 0 2352 15780 0 0 1348 15782 0 0 948 22896 0 0 9360

[linux] Retrieve CPU usage and memory usage of a single process on Linux?

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