What is the command used to find the process that consumes the most CPU and memory time?

I'm looking for somthing like top is to CPU usage. Is there a command line argument for top that does this? Currently, my memory is so full that even 'man top' fails with out of memory :)

asked Dec 19, 2010 at 6:41

2

From inside top you can try the following:

• Press SHIFT+f
• Press the Letter corresponding to %MEM
• Press ENTER

You might also try:

$ ps -eo pmem,pcpu,vsize,pid,cmd | sort -k 1 -nr | head -5

This will give the top 5 processes by memory usage.

answered Dec 19, 2010 at 6:54

Steven DSteven D

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5

If you have it installed I like htop once launching it you can press f6, down arrow (to MEM%), enter to sort by memory.

answered Dec 19, 2010 at 10:17

xenoterracidexenoterracide

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In Solaris the command you would need is:

prstat -a -s size

This will list all processes in order of descending process image size. Note that the latter is based on memory committed to the process by the OS, not its resident physical memory usage.

There are supposedly versions of "top" available for Solaris, but these are not part of the standard installation.

answered Dec 19, 2010 at 13:42

1

Once top starts, press F to switch to the sort field screen. Choose one of the fields listed by pressing the key listed on the left; you probably want N for MEM%

answered Dec 19, 2010 at 6:53

Michael MrozekMichael Mrozek

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This command will identify the top memory consuming processes:

ps -A --sort -rss -o pid,pmem:40,cmd:500 | head -n 6 | tr -s " " ";z"

Ouki

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answered Nov 4, 2014 at 6:26

user90191user90191

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One nice alternative to top is htop. Check it, it is much more user friendly than regular top.

answered Dec 19, 2010 at 15:15

KlarkKlark

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Globally: It's always recommended to use a log analyser tool for logging history logs such as Splunk, ELK etc. So that using query language you can easily get the PIDs and its usage by CPU & memory.

AT SERVER/OS LEVEL: From inside top you can try the following:

 Press SHIFT+M  ---> This will give you a process which takes more memory in descending order.

You might also try:

$ ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head -10

This will give the top 10 processes by memory usage. Also you can use vmstat utility to find the RAM usage at same time not for history.

answered Mar 2, 2020 at 11:10

1

It can be achieved in multiple ways, My favourite one is:

The PS way:

1. [arif@arif ~]$ ps -eo pid,cmd,%cpu,%mem --sort=-%mem

   Where,

   • -e: to select all process
   • -o: to apply to the output format
   • pid,cmd,%cpu,%mem: Output format in exact order. Here, pcpu and pmem can be used instead of %cpu and %mem.
   • But sadly (don't know why) it doesn't work on some machine (Oracle Linux) and some older machine. You can use the following similar alternatives.

2. [arif@arif ~]$ ps aux --sort '-%mem' --cols 120 | head

   Where,

   • --cols 100: to specify column width of the output as sometimes cmd gets very long. This is not necessary if you don't want curtailed commands with arguments.
   • aux: to see every process on the system using BSD syntax

3. [arif@arif ~]$ ps -eo pid,cmd,%cpu,%mem --sort -rss

   Where,

   • -rss: resident set size, the non-swapped physical memory that a task has used

4. [arif@arif ~]$ ps aux --sort -rss --cols 120

The top way:

[arif@arif ~]$ top -b -o +%MEM

Where,

• -b: to use top as batch mode.
• -o: to override sort fieldname followed by a fieldname %MEM

And you can always use head and/or tail to control the output.

answered Jan 5, 2020 at 0:16

arifarif

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You can try ps aux --sort -rss | head or ps aux | sort -nk +4 | tail

answered Jul 14, 2017 at 14:40

David OkwiiDavid Okwii

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This alias works nice for me in a bash shell:

alias mtop='{ echo "Mem% PID Binary"; ps -A --sort -rss -o pid,pmem:40,cmd:500 | tail -n +2 | head -n 10 | tr -s " " | sed -r "s/^\s*([0-9]+) ([0-9.]+) ([a-zA-Z/]+).*$/\2 \1 \3/"; } | column -t -s " "'

This will print out a neat list of processes sorted by memory consumption:

-=# mtop
Mem%  PID     Binary
22.9  528235  /opt/intellij
5.4   906569  /usr/share/elasticsearch/jdk/bin/java
3.7   544512  /usr/bin/node
2.2   986170  /usr/lib/firefox/firefox
1.9   795138  /usr/bin/node
1.1   795188  /usr/bin/node
1.0   747819  /usr/lib/jvm/java
0.9   599     /usr/bin/pipewire
0.7   414     /usr/lib/Xorg
0.7   544536  /usr/bin/node

answered Jul 9 at 10:29

fassegfasseg

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