How to detect memory usage in hash?

[sonet]

How to know how many memory usage in a hash??
I just can use top to see the memory usage?

-----How to rough estimate ?---

my %hash;
for (my $i=0;$i<=10000;$i++){
$hash{abc}{$i}='testing';
}

 

[Gregory Toomey]

How to know how many memory usage in a hash??
I just can use top to see the memory usage?

-----How to rough estimate ?---

my %hash;
for (my $i=0;$i<=10000;$i++){
$hash{abc}{$i}='testing';
}

For a non-portable linux solution, read /proc/$$/status, and look for a line
with 'VmSize'.

gtoomey

 

[xhoster]

How to know how many memory usage in a hash??

That depends on many things.

I just can use top to see the memory usage?

Sure, if your system has top. Of course, it will be memory of the
entire perl program, not just the hash. To do it from withing Perl,
I usually use "my $mem = (`ps -p $$ -o rss `)[1];", which gives just the
resident size of the whole program, but is usually good enough.
There is also Devel::Size, but I often find it to be unreliable and that
it causes worse problems than the ones I'm trying to use it to solve.

Xho