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Date:	Thu, 29 Aug 2013 17:11:21 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: xz -9 : Cannot allocate memory
Message-ID:	<20130829151121.GR21571@calimero.vinschen.de>
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On Aug 29 14:34, Achim Gratz wrote:
> Achim Gratz <Stromeko <at> NexGo.DE> writes:
> > With the initial heap size set to 1MB, the same allocations for mmap wo=
rk
> > just fine.  The mmap length used by xz is the same for files of all siz=
es.
>=20
> The large mmap is for the scratchpad memory of xz, which can be limited v=
ia
> the -M option.  Currently it fails when this gets larger than 616MiB
> (standard for -9 is 674Mib).

I'm not exactly surprised.  You're on a 32 bit machine, so you only have
2 Gigs VM.  Probably some DLLs are in the way.  Load xz under GDB, break
on "cygwin_exit", run it, and when it hits the breakpoint, observer the
memory layout, either in GDB, or by cat'ing /proc/<xz's pid>/maps.
Observing the memory layout helps a lot to understand why there's some
memory problem, especially if the application tries to get a big buffer
space in a single chunk.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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