Severe performance degradation on Linux

[Maarten Hoes]

Hi,


On Mon, Jan 5, 2015 at 10:47 PM, Michael Stahl <mstahl at redhat.com> wrote:
>
> On 05.01.2015 18:36, Maarten Hoes wrote:
> >
> > For what its worth, i can easily reproduce the script takes fairly long
> > (about ~50 seconds on my vm's) to complete on both Ubuntu 14.04 and
> > Fedora 21, both with the distro supplied binaries and a recent master.
> >
> > I ran the script using strace -f. It shows a lot of calls on futex(
> > 'FUTEX_WAIT_PRIVATE'), though im not sure how relevant that may be. I
> > attached the strace output.
>
> please try that again and use strace options -T -r so it's easier to see
> where the time is spent.
>
Done. Unfortunately, the resulting file (even compressed) is too large as
an attachment for this mailing list. Instead, I uploaded it here :

http://filebin.ca/1nCIQSm4AW6n/strace-f-T-r.log.txt.gz

Please tell me if that proves to be problematic; im open for other
suggestions.


>
> this problem is probably not CPU bound,
>
This is correct. My hosts CPU is barely doing anything during the run of
the script


- Maarten
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