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Date: Wed, 22 Aug 2012 17:42:19 -0400
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Subject: Re: [gentoo-user] xz memory hungry?
From: Michael Mol <mikemol@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Wed, Aug 22, 2012 at 5:16 PM, Jorge Almeida <jjalmeida@gmail.com> wrote:
> On Wed, Aug 22, 2012 at 9:39 PM, Florian Philipp <lists@binarywings.net> wrote:
>> Am 22.08.2012 20:52, schrieb Jorge Almeida:
>>
>> This should not happen, especially on such a small archive. I've tried
>> `strace xz -t m4-1.4.16.tar.xz` and looked for calls to mmap (e.g.
>> memory allocations). They never were larger than 68 MB
>>
>> Try it yourself. The second parameter in mmap is the allocated size in byte.
>>
>>
> In the box where it works:

[snip]
> In the other box, in the gentoo chroot:
>
> # strace -e trace=mmap2 xz -t /usr/portage/distfiles/m4-1.4.16.tar.xz

[snip]

> mmap2(NULL, 67112960, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> -1, 0) = -1 ENOMEM (Cannot allocate memory)

It's only asking for about 65MB of RAM there. ENOMEM is nearly a
catch-all failure code for mmap().

My bet is that it's an incompatibility between the Arch kernel and the
version of glibc in the chroot.

-- 
:wq