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Moin,
On Sunday 26 June 2005 14:32, Michael G Schwern wrote:
> On Sun, Jun 26, 2005 at 01:58:26PM +0200, Tels wrote:
> > (Including vars, because that gives us strict, vars, and warnings as
> > a baseline):
> >
> > # ./perl -Ilib -Mvars -le 'print join ("\n", sort keys %INC); sleep
> > (100)' strict.pm
> > vars.pm
> > warnings.pm
> > warnings/register.pm
>
> Carp doesn't use any of this. Just Exporter.
You are right, my bad.
> schwern 12629 0.0 2.8 4048 1724 pts/0 S Jun21 0:00 perl
> -MCarp -MCarp::Heavy -wle print join "\n", keys %INC; sleep 100
>
>
> I never was any good at interpreting ps output but it looks like
> loading Carp on top of Exporter adds a grand total of 56K on my Debian
> box (5.8.4). Carp::Heavy slugs in 208K plus another 132K of virtual
> memory. Exporter weighs in at 204K + 140K virtual.
>
> I'd take the Exporter numbers with a grain of salt, its a very small
> module. No where near the size of Carp::Heavy and shouldn't cost that
> much memory. The above might be measuring some sort of first module
> loaded cost. Have a look at loading strict vs strict + Exporter.
>
> schwern 12659 0.0 2.2 3784 1376 pts/0 S Jun21 0:00 perl
> -Mstrict -wle print join "\n", keys %INC; sleep 100; schwern 12662
> 0.0 2.4 3916 1492 pts/0 S Jun21 0:00 perl -MExporter -Mstrict
> -wle print join "\n", keys %INC; sleep 100;
>
> strict costs 120K + 8K vm. strict + Exporter is 236K + 140K vm. Note
> that if we add the cost of strict alone with the cost of Exporter alone
> the numbers don't jive with loading both of them together. It should
> cost 324K + 148K vm, but it actually costs nearly 100K less. So
> checking the cost of loading a module by subtracting the cost of
> loading all its dependencies from the cost of loading the module might
> not be accurate.
See Dave's post about malloc granularity - that might explain a few
things.
So, in conclusion, I think it is worthwhile to apply these changes,
because:
* no matter how you measure it, memory consumption goes down
* the changes are small and pure-perl only
Does anybody disagree with me?
Best wishes,
Tels
- --
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