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Determining memory usage of a process...

by dragonchild (Archbishop)
on Sep 27, 2001 at 18:15 UTC ( #115098=perlquestion: print w/replies, xml ) Need Help??

dragonchild has asked for the wisdom of the Perl Monks concerning the following question: (programs and processes)

How would I, from within the current process, determine my own memory usage?

Originally posted as a Categorized Question.

  • Comment on Determining memory usage of a process...

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Re: Determining memory usage of a process...
by rob_au (Abbot) on Sep 28, 2001 at 16:22 UTC
    The best method to do this would be to make use of the Proc::ProcessTable module which provides access to the Unix process table in a consistent fashion, hiding the vagarities of different /proc implementations.

    The following documented code will return the total memory usage and the percentage memory utilisation of the current process by iteration through the process table:

    #!/usr/bin/perl -w use strict; print join("\n", &memusage), "\n"; exit 0; # memusage subroutine # # usage: memusage [processid] # # this subroutine takes only one parameter, the process id for # which memory usage information is to be returned. If # undefined, the current process id is assumed. # # Returns array of two values, raw process memory size and # percentage memory utilisation, in this order. Returns # undefined if these values cannot be determined. sub memusage { use Proc::ProcessTable; my @results; my $pid = (defined($_[0])) ? $_[0] : $$; my $proc = Proc::ProcessTable->new; my %fields = map { $_ => 1 } $proc->fields; return undef unless exists $fields{'pid'}; foreach (@{$proc->table}) { if ($_->pid eq $pid) { push (@results, $_->size) if exists $fields{'size'}; push (@results, $_->pctmem) if exists $fields{'pctmem'}; }; }; return @results; }


    Ooohhh, Rob no beer function well without!

Re: Determining memory usage of a process...
by Zaxo (Archbishop) on Sep 28, 2001 at 09:32 UTC

    On Linux (since h option differs from BSD),

    my $sz = `ps h -o sz $$`;
    Other ps stats can be gotten similarly. It uses the rich ps system call for process stats, see 'man ps'. Perl's $$ variable is the current pid.

    Another approach is to root around in the "/proc/$$/" or '/proc/self/' directory.

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