[zeromq-dev] Strace dump from a ZeroMQ CPU Freak Out

[Pieter Hintjens]

Hi Zed,

I'd at least use the current git master since there are quite a few bug
fixes since 2.0.10.

-Pieter
On 21 Jan 2011 20:21, "Zed Shaw" <zed.shaw at gmail.com> wrote:
> Hi Everyone,
>
> I had been receiving reports of Mongrel2 still pegging the CPU at
> random times but I couldn't get a trace from any body.
>
> Today my Mongrel2 server at zedshaw.com hit 100% CPU and I was able to
> strace it and see that it's the same fast loop in zeromq_poll as I've
> reported in the past:
>
> ...
> rt_sigprocmask(SIG_SETMASK, [], [], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], [], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], [], 8) = 0
> gettimeofday({1295636938, 117782}, NULL) = 0
> poll([{fd=1991, events=POLLIN}, {fd=202, events=POLLIN}, {fd=491,
> events=POLLIN}, {fd=148, events=POLLIN}, {fd=84, events=POLLIN},
> {fd=195, events=POLLIN}, {fd=681, events=POLLIN}, {fd=222,
> events=POLLIN}, {fd=1684, events=POLLIN}, {fd=778, events=POLLIN},
> {fd=94, events=POLLIN}, {fd=964, events=POLLIN}, {fd=325,
> events=POLLIN}, {fd=224, events=POLLIN}, {fd=219, events=POLLIN},
> {fd=188, events=POLLIN}, {fd=158, events=POLLIN}, {fd=182,
> events=POLLIN}, {fd=154, events=POLLIN}, {fd=51, events=POLLIN},
> {fd=93, events=POLLIN}, {fd=157, events=POLLIN}, {fd=221,
> events=POLLIN}, {fd=425, events=POLLIN}, {fd=262, events=POLLIN},
> {fd=190, events=POLLIN}, {fd=220, events=POLLIN}, {fd=191,
> events=POLLIN}, {fd=1399, events=POLLIN}, {fd=189, events=POLLIN},
> {fd=192, events=POLLIN}, {fd=89, events=POLLIN}, ...], 2536, 0) = 17
> ([...])
> gettimeofday({1295636938, 127782}, NULL) = 0
> rt_sigprocmask(SIG_SETMASK, [], [], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], [], 8) = 0
> ...
>
> From what I can tell this being run inside zeromq_poll but not
> returning to my code, but I'll double check that I'm actually getting
> this behavior later today.
>
> This is with the latest 2.0.10 zeromq and with threads set to 1. Any
> pointers people might have to debugging this would really help.
> Thanks.
>
> Zed
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>
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