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Message-ID: <42E7DEA5.3040400@familiehaase.de>
Date: Wed, 27 Jul 2005 21:21:09 +0200
From: "Gerrit P. Haase" <gerrit AT familiehaase DOT de>
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To: Krzysztof Duleba <krzysan AT skrzynka DOT pl>
CC: cygwin AT cygwin DOT com
Subject: Re: perl - segfault on "free unused scalar"
References: <dc7n8k$m72$1 AT sea DOT gmane DOT org> <42E76865 DOT 4000301 AT familiehaase DOT de> <dc82t0$r0a$1 AT sea DOT gmane DOT org> <42E7B413 DOT 8040203 AT familiehaase DOT de> <dc8ebq$36m$1 AT sea DOT gmane DOT org>
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Krzysztof Duleba wrote:

> But there's plenty of memory left when perl crashes. I have 1 GB RAM and 
> 1 GB swap file.
> 
> I've simplified the test case. It seems that Cygwin perl can't handle 
> too much memory. For instance:
> 
> $ perl -e '$a="a"x(200 * 1024 * 1024); sleep 9'

This requires about 525 MB on my box.

> OK, this could have failed because $a might require 200 MB of continuous 
> space. But hashes don't, do they? Then why does the following code fail?
> 
> $ perl -e '$a="a"x(1024 * 1024);my %b; $b{$_}=$a for(1..400);sleep 9'
> 
> Or that one?

Requires a little more, maybe about 550 MB.

> $ perl -e '$a="a"x(50 * 1024 * 1024);$b=$a;$c=$a;$d=$a;$e=$a;sleep 10'


This requires not that much, nearly 400 MB, but it is still about 16 MB
too much for the default Cygwin settings of 384 MB per program.

> On linux there's no such problem - perl can use all available memory.

Please see the docs about the limits on Cygwin how to increase the
maximum memory usage: 
http://cygwin.com/cygwin-ug-net/cygwin-ug-net.html#setup-maxmem


Regards,
Gerrit
-- 
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