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01.23.2002 at 12:58PM PST, ID: 20258690
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Determining process memory usage

Tags: memory, usage, process
What's the best way to determine how much real and virtual memory a process has:

1. shared with other processes. i.e. shared libraries/shared executable text.
2. allocated for private usage.

I need the information to determine system memory sizing. I have an executable which is a run time virtual machine (similar in concept to a jvm). It will be executed concurrently by hundreds of users. The size of the executable on disk is about 900Kb.

size gives:
   text    data     bss     dec     hex filename
 332202   34084  183620  549906   86412 /home/pb/bin/vm

ps -vax gives:
  PID TTY      STAT   TIME  MAJFL   TRS   DRS  RSS %MEM COMMAND
31708 pts/0    S      0:00    837   324  7963 3832  1.5 vm prog1

How should that information be interpreted to help me figure out the memory requirements of a machine for, say, 500 users.

Thanks
Paul
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Question Stats
Zone: OS
Question Asked By: zebada
Solution Provided By: chris_calabrese
Participating Experts: 3
Solution Grade: A
Views: 0
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01.23.2002 at 03:24PM PST, ID: 6752314

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01.23.2002 at 04:55PM PST, ID: 6752450

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01.23.2002 at 06:38PM PST, ID: 6752587

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01.24.2002 at 07:05AM PST, ID: 6753764

Rank: Master

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01.26.2002 at 02:12PM PST, ID: 6758407

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01.26.2002 at 02:51PM PST, ID: 6758455

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01.23.2002 at 03:24PM PST, ID: 6752314
What platform and OS are you running?
 
01.23.2002 at 04:55PM PST, ID: 6752450
I need the info for all of: HP-UX, Compaq Tru64, Solaris and Linux.
 
01.23.2002 at 06:38PM PST, ID: 6752587
Well for Solaris you should download the memtool package which is featured in the Solaris Internals book (http://playground.sun.com/pub/memtool/) as this will tell you everything you ever wanted to know (and more) about application memory usage.

Cheers - Gavin
 
01.24.2002 at 07:05AM PST, ID: 6753764

Rank: Master

Size just tells you about the static memory required by loading the executable, not how much memory it actually consumes in real life.

The ps command, however, will give you information on real running processes, so this is what you want to use.

On Solaris, ps -e -o pid,vsz,rss,args will tell you the total memory consumption in kilobytes(VSZ)and the amount of memory currently resident in RAM (i.e., not swapped) (RSS).

On HP-UX, UNIX95=true ps -e -o pid,vsz,args will tell you the total memory consumption (VSZ), but not the resident set size / swap usage.

Don't know for True64.  Linux probably works similarly to Solaris, though you can also grope around in /proc pretty easily.
Accepted Solution
 
01.26.2002 at 02:12PM PST, ID: 6758407
Hi.
There is something called "ipcs" on solaris and a few other Eunices that shows processes shared memory. It requires a little detective-work to see how much total memory a process has though, if my memory serves me correctly.

Hope this helps in some way.

wbr

.haeger
 
01.26.2002 at 02:51PM PST, ID: 6758455
haeger, I think you will find that ipcs relates to application defined shared memory segments and ipc resources (semaphores, msg queues etc) - I think what he is after is the size of the shared segments in libraries called by the application. The memtool applications will show this.

Cheers - Gavin
 
 
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