How to get memory usage by the program

[sheila11]

Hi all,

I want to know which of my two programms requires lesser memory. Is there a way to know how much memory space is used by your program?

TIA,
Sheila

 

[quagsire]

ps v pid

Read the man pages on ps for what each column mean.

 

[Themuppeteer]

you can use the 'top' command too
Greetz,

The Muppeteer.

http://www16.brinkster.com/themuppeteer/knight.gif

themuppeteer@hotmail.com

http://www.themuppeteer.tk

Don't eat yellow snow...

 

[sheila11]

Sorry, I should have mentioned that I need to get this information thru C++ code. I can't ask the Unix Admn to manually check it for me. My program itself has to fetch it.

 

[tdatgod]

Why do you need to bother the Admin?

you can run PS on your processes can't you?

I know some places restrict the use of PS agaisnt the whole system but you should be able to see your own program.

 

[Themuppeteer]

there are different ways to start a command and read the result in the program.
e.g the 'popen' command is one of them (search this forum for explanation on usage).
execvp is also a command execute a program,theres much info on the web and on this forum (I wrote it )

1)execute the command ps|grep yourprog1
2)parse the line and get the pid of your program
3 & 4)do the same for your other program
5)execute ps v pid for both your programs and read in the
memory usage.

another way is:

execute:

1)top -1 -b>tempfile //this will dump top in a file
2) read the file and make your conclusions
Hope this helps. Greetz,

The Muppeteer.
themuppeteer@hotmail.com

http://www.themuppeteer.tk

Don't eat yellow snow...

 

[Zebra2k]

Have you tried using getrusage() yet? I don't know if it is supported on Linux.

zb

 

[vgg]

Hi Sheila,

Here's some piece of code that may be of help to you.
Say you have two programs pgm1 and pgm2:

ps -efl|grep pgm1 |sed 's/ */ /g'|cut -f11 -d' '|pg >pgm1_siz

ps -efl|grep pgm2 |sed 's/ */ /g'|cut -f11 -d' '|pg > pgm2_siz

diff siz_pgm1 siz_pgm2 > diff_pgm12_siz

Note:The eleventh field of "ps -efl" is the memory size of your process

You can do the above steps using system() or popen() from your C++ code.

regards,
VGG

 

[vgg]

Hi sheila,
Sorry on my previous one.
Make this correction:
ps -efl|grep pgm1 |sed 's/ */ /g'|cut -f11 -d' ' >pgm1_siz

ps -efl|grep pgm2 |sed 's/ */ /g'|cut -f11 -d' '> pgm2_siz

diff pgm1_siz pgm2_siz > diff_pgm12_siz

regards,
VGG