2009/12/30 Zhao, Dong:
> Dear All:
> Recently our Perl project run into the "Out of memory" issue on Windows
> Cygwin, while it works well on Linux, after optimized the code ,it still
> didn't work on Windows Cygwin perl(Because we do a lot of analysis bases on
> string arrays and hashes) . We found the reason is Cygwin perl uses much more
> memory than Linux perl or Windows As perl.
> We did a lot searches over the internet but didn't found a solution yet.
> I did tune the "heap_chunk_in_mb" flag to "2048" in registry
> "Software/Cygnus Solutions/Cygwin/". But our Perl script still exhausted over
> 1GB memory and crashes on Cygwin perl.
>
> Then I compared the memory usage difference between Cygwin perl, Windows AS
> perl, and Linux Perl use this simple script:
>
> my @array = ();
> my $str = "A" x 1024; #A string with 1024 len
> for(my $i=0;$i<100*1024;$i++){
> push @array,$str;
> }
> <STDIN>; #No we can take a look at memory.
>
> I expected it to use about 100M memory for all platforms. But Windows cygwin
> perl use about 200M, while AS perl and Linux perl only used 100M.
> Our current cygwin perl version is v5.10.0. And cygwin version is 1.7.1.
> I also tried the latest cygwin perl version : v5.10.1. But still the same
> result.
>
> Can anyone explain to me? It there a simple way to reduce the cygwin perl's
> memory usage(Set some flag?Or recomple cygwin perl code)
> Thanks for any answer!
I 'll investigate. Best is always to pre-allocate huge memory to help
those malloc calls.
We are using the standard perl malloc -Dusemymalloc=y (hints/cygwin.sh)
Maybe the other platforms are using their system malloc.
You can override that with -Dusemymalloc=n
../perl-5.10.1/Configure -de -Dlibperl=cygperl5_10_sysmalloc.dll
-Dmksymlinks -Dusethreads -Dmad=y -Dusemymalloc=n
(untested)
--
Reini Urban
http://phpwiki.org/ http://murbreak.at/
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