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Date:	Thu, 29 Aug 2013 18:00:00 +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:	<20130829160000.GT21571@calimero.vinschen.de>
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On Aug 29 11:32, Charles Wilson wrote:
> On 8/29/2013 11:11 AM, Corinna Vinschen wrote:
> >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 w=
ork
> >>>just fine.  The mmap length used by xz is the same for files of all si=
zes.
> >>
> >>The large mmap is for the scratchpad memory of xz, which can be limited=
 via
> >>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.
>=20
> So...this is NOTABUG, right?

Right.  But is a bit lame that it just fails.  Does it have to use
this big buffer or would it also work with a smaller buffer, if there's
no memory chunk big enough?


Corinna

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

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