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X-HELO: calimero.vinschen.de
Date: Fri, 30 Aug 2013 19:46:31 +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: <20130830174631.GA8831@calimero.vinschen.de>
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References: <50A41697 DOT 3080406 AT tiscali DOT co DOT uk> <loom DOT 20130829T155739-66 AT post DOT gmane DOT org> <loom DOT 20130829T162752-851 AT post DOT gmane DOT org> <20130829151121 DOT GR21571 AT calimero DOT vinschen DOT de> <87ioyowbq9 DOT fsf AT Rainer DOT invalid> <loom DOT 20130830T111847-683 AT post DOT gmane DOT org> <20130830120244 DOT GV21571 AT calimero DOT vinschen DOT de> <loom DOT 20130830T143654-505 AT post DOT gmane DOT org>
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On Aug 30 12:58, Achim Gratz wrote:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
> > Yes, looks normal and expected from what you observed.  mmap commits
> > memory top-down and that was apparently the first free slot big enough
> > to fullfil the request.  The default heap size is 384 Megs and then
> > there's apparently not enough space anywhere.
>=20
> Sorry if I'm dense, but does this mean that setting the default heap size=
 to
> zero does in fact mean it's trying to use 374MiB... wait, yes it is: the
> memory map is the same when I'm setting the initial heap size to 384MiB w=
ith
> peflags.
>=20
> So, even though that rather large heap is essentially unused at the point=
 of
> failure and there is enough memory free just beyond the heap, the allocat=
ion
> still fails because both the existing heap and the free space are both
> smaller than what's requested?

Well, good question.  You could debug the sbrk function and see why
it fails to reserve the space.


Corinna

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

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