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] : $$;
my $proc = Proc::ProcessTable->new;
my %fields = map { $_ => 1 } $proc->fields;
return undef unless exists $fields{'pid'};
foreach (@{$proc->table}) {
if ($_->pid eq $pid) {
push (@results, $_->size) if exists $fields{'size'};
push (@results, $_->pctmem) if exists $fields{'pctmem'};
};
};
return @results;
}
Ooohhh, Rob no beer function well without! | [reply]
[d/l]
[select] |
On Linux (since h option differs from BSD),
my $sz = `ps h -o sz $$`;
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.
| [reply]
[d/l] |
my $mem = GTop->new;
print "Total memory: ", $mem->total / 1024, "K\n";
Edited by planetscape - closed code tag
Originally posted as a Categorized Answer. | [reply]
[d/l] |