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Re: IMPLICIT_SYS and Perl_Malloc behaviour under Win32 (out of memorywith Perls malloc?)

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Steve Hay
January 4, 2005 02:02
Re: IMPLICIT_SYS and Perl_Malloc behaviour under Win32 (out of memorywith Perls malloc?)
Message ID:
Orton, Yves wrote:

>This message is kindof a follow up to message
>I just tried out building Perl 5.8.4 (using the sources from Activestate
>Build 810) without having PERL_IMPLICIT_SYS set and with using Perls malloc.
>I commented out the USE_IMP_SYS = define line in the makefile as well as
>uncommenting the PERL_MALLOC = define line. I tried with both DEBUG_MSTATS
>and without. My test code was a hybrid Inline::C/Perl tool that is quite
>memory hungry.
>The end result was that with Perls malloc I ran out of memory quite quickly.
>I got this message:
>  Out of memory during "large" request for 16781312 bytes, total sbrk() is
>56289280 bytes at ....
>When run with the unaltered AS build 810 it didnt run out of memory, and
>Devel::Size reported that the total memory utilization for the data
>structure being constructed ran to a total of 20MB. 
>Having said all of that, when I didnt run out of memory my tests showed that
>with perls malloc things were modestly faster. 
>I was wondering if anybody had any suggestions, it seems odd that with the
>Perl Malloc i run out of memory when without it I dont.
Perl's malloc() requires an sbrk() function, which Win32's CRT doesn't 
provide.  Therefore, Perl's win32.c source provides one, but this had 
some limitations which would lead to the kind of out of memory error 
that you've seen.

I had a patch committed which should fix the problem that you had:

This patch went into 5.8.6, so please retry with that and let us know 
how you get on.

- Steve

Radan Computational Ltd.

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