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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):
> 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.
I had an idea: It might be that loading a module allocates some memory and
then frees it again, but doesn't return it to the OS. So if you do:
use A;
briefly uses 200 Kb, but frees 100. Then you do:
use A;
use B;
(both show 200 Kbyte process growth when loaded independently). But since
loading A free 100 Kbyte, B only needs 100 more and the final process
size is a bit smaller. AFAIK, ps and top don't show how much memory Perl
is actually using from the size it claimed.
Best wishes,
Tels
- --
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