in reply to comparison between system operators and Built in function

Hi,

    When some one wants to you use the OS related operations, they will try to use "system" function. It will be easier for them to use. But, when you use those functions, it will be executed by the shell, and the value will be returned. That will definitely increase system load. Instead of that you can use the builtin functions which is available in perl itself. But, here you need to find out the appropriate module and have to use the correct function. When you go for the builtin functions, it wont take much time compared to the system functions.



Regards,
S.Venni Rajan.
"A Flair For Excellence."
                -- BK Systems.
  • Comment on Re: comparison between system operators and Built in function

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Re^2: comparison between system operators and Built in function
by blazar (Canon) on Jan 19, 2006 at 09:13 UTC
    But, when you use those functions, it will be executed by the shell, and the value will be returned.

    Really?

    q:~ [10:07:26]$ ps U blazar
  PID TTY      STAT   TIME COMMAND
11831 ?        S      0:00 sshd: blazar@pts/0
11838 pts/0    Ss     0:00 -bash
11857 pts/0    R+     0:00 ps U blazar
q:~ [10:07:32]$ perl -e 'system qw/sleep 600/'

[1]+  Stopped                 perl -e 'system qw/sleep 600/'
q:~ [10:08:09]$ ps U blazar
  PID TTY      STAT   TIME COMMAND
11831 ?        S      0:00 sshd: blazar@pts/0
11838 pts/0    Ss     0:00 -bash
11908 pts/0    T      0:00 perl -e system qw/sleep 600/
11909 pts/0    T      0:00 sleep 600
11922 pts/0    R+     0:00 ps U blazar

    [download]

    I don't see additional shells...

    (To the benefit of the OP) this "detail" apart, indeed system calls are expensive.

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