How to find memory taken by a process using top command?

Linux and Unix-Like Red Hat
1

I wanted to know how to find the memory taken by a process using top command. The output of the top command is as follows as an example:

Mem:  13333364k total, 13238904k used,    94460k free,   623640k buffers
Swap: 25165816k total,      112k used, 25165704k free,  4572904k cached

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
16514 applmgr   25   0 2197m 1.7g  10m S  0.3 13.0  15:20.67 java
30692 crestelo  22   0 2901m 1.4g 9284 S  0.0 11.0   3:03.68 java
30431 crestelo  25   0 2043m 1.4g 161m S 50.9 11.0  79:02.73 java
30869 crestelo  25   0 2860m 1.2g 9292 S  0.0  9.6   7:11.18 java
16655 applmgr   23   0 1934m 1.1g  10m S  0.3  8.9   2:17.49 java
16319 crestelo  19   0 1541m 299m  44m S  0.0  2.3   2:52.11 java

I hope, my question is clear as to how to find the memory taken by a process using top command.

Please revert with the reply to my query.

Regards

2

n: %MEM -- Memory usage (RES)
A tasks currently used share of available physical memory.

3

Thanks for your answer but I was looking at the amount of memory taken by a process and not the % of CPU used by a process.

4

%MEM is % of memory used and not % of CPU used by a process.

For knowing amount you can rely on field RES

 
 
RES  --  Resident size (kb)
          The non-swapped physical memory a task has used.
          RES = CODE + DATA.

there are few more fields from which you can collect memory size related information...

 
       o: VIRT  --  Virtual Image (kb)
          The  total  amount  of  virtual memory used by the task.  It includes all code, data and shared libraries plus pages that have been
          swapped out. (Note: you can define the STATSIZE=1 environment variable and the VIRT  will  be  calculated  from  the  /proc/#/state
          VmSize field.)
          VIRT = SWAP + RES.
       p: SWAP  --  Swapped size (kb)
          The swapped out portion of a task�s total virtual memory image.
       q: RES  --  Resident size (kb)
          The non-swapped physical memory a task has used.
          RES = CODE + DATA.
       r: CODE  --  Code size (kb)
          The amount of physical memory devoted to executable code, also known as the �text resident set� size or TRS.
       s: DATA  --  Data+Stack size (kb)
          The amount of physical memory devoted to other than executable code, also known as the �data resident set� size or DRS.
       t: SHR  --  Shared Mem size (kb)
          The amount of shared memory used by a task.  It simply reflects memory that could be potentially shared with other processes.
5

I was wondering how to get the options for SWAP, CODE. Can you please give the syntax to give with the top command?

6

For top command

To sort process as per swap page usage

Capital O followed by p (small p) andthen Enter key

not this is wat or something other u look

7

Would the output of ps do the trick?

ps -lp $PID

Column 10 has the memory size allocated.

ps -lp $$
F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
4 S  7006 10701 10700  0  80   0 - 26772 wait   pts/9    00:00:00 ksh

This has my shell process being 26,772Kb

Robin