Re: memory usage by a process

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Date: Fri, 29 Apr 2005 06:00:24 +0000 (UTC)

On 2005-04-29, niraj.kumar.ait@gmail.com <niraj.kumar.ait@gmail.com> wrote:

> Is their any system call or library to find the memory usage of a

you didn't define precisely what you mean by memory usage. In
particular are you thinking of virtual memory space or physical RAM
usage (which is ill-defined, since a process also consumes the cache
for files it accesses).

I assume you are interested by virtual memory space

> particular process nd total cpu utilization of a particular system.

Ypu might consider using the getrusage(2) system call.

> I dont wanna use top command and proc directory.

  I might understand that you don't want to use top or ps, but I don't
understand why you don't want to use /proc

  From inside your program, a simple way to ask for its memory mapping
is to read and parse the /proc/self/maps file. For an example, run
the command "cat /proc/self/maps" which on my system (Debian/Sid) gives
the map of the process running cat

    % cat /proc/self/maps
    08048000-0804c000 r-xp 00000000 03:02 2828919 /bin/cat
    0804c000-0804d000 rw-p 00003000 03:02 2828919 /bin/cat
    0804d000-0806e000 rw-p 0804d000 00:00 0 [heap]
    b7bca000-b7dca000 r--p 00000000 03:03 718366 /usr/lib/locale/locale-archive
    b7dca000-b7dcb000 rw-p b7dca000 00:00 0
    b7dcb000-b7ef5000 r-xp 00000000 03:02 3597455 /lib/tls/libc-2.3.2.so
    b7ef5000-b7efe000 rw-p 00129000 03:02 3597455 /lib/tls/libc-2.3.2.so
    b7efe000-b7f00000 rw-p b7efe000 00:00 0
    b7f23000-b7f24000 rw-p b7f23000 00:00 0
    b7f24000-b7f3a000 r-xp 00000000 03:02 1177349 /lib/ld-2.3.2.so
    b7f3a000-b7f3b000 rw-p 00015000 03:02 1177349 /lib/ld-2.3.2.so
    bf825000-bf83a000 rw-p bf825000 00:00 0 [stack]
    ffffe000-fffff000 ---p 00000000 00:00 0 [vdso]

  From another program (or a shell), to get the memory mapping of
process 1234 just read /proc/1234/maps

Regards

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