From: David Dillow <dave-i1Mk8JYDVaaSihdK6806/g@public.gmane.org>
To: Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Cc: Sebastian Riemer
<sebastian.riemer-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: OpenSM 3.3.16 at 100% CPU load, "console off"
Date: Wed, 09 Oct 2013 09:30:45 -0400 [thread overview]
Message-ID: <1381325445.27365.4.camel@haswell.thedillows.org> (raw)
In-Reply-To: <52555A04.8080606-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
On Wed, 2013-10-09 at 09:28 -0400, Hal Rosenstock wrote:
> >>From strace:
> > poll([{fd=0, events=POLLIN}], 1, 1000) = 1 ([{fd=0, revents=POLLIN}])
> > read(0, "", 4096) = 0
> > poll([{fd=0, events=POLLIN}], 1, 1000) = 1 ([{fd=0, revents=POLLIN}])
> > read(0, "", 4096) = 0
> > poll([{fd=0, events=POLLIN}], 1, 1000) = 1 ([{fd=0, revents=POLLIN}])
> > read(0, "", 4096) = 0
>
> So this doesn't block for 1 second and that's why the CPU is 100% ?
Looks like it is spinning on a closed socket (or stdin) -- calling
poll() on such will return immediately...
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next prev parent reply other threads:[~2013-10-09 13:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-09 11:10 OpenSM 3.3.16 at 100% CPU load, "console off" Sebastian Riemer
[not found] ` <525539A4.8090700-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
2013-10-09 13:28 ` Hal Rosenstock
[not found] ` <52555A04.8080606-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2013-10-09 13:30 ` David Dillow [this message]
[not found] ` <1381325445.27365.4.camel-a7a0dvSY7KqLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2013-10-09 13:53 ` Sebastian Riemer
2013-10-09 14:00 ` Hal Rosenstock
[not found] ` <52556172.2070707-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2013-10-09 14:45 ` Sebastian Riemer
[not found] ` <52556BEE.5070409-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
2013-10-09 15:15 ` Hal Rosenstock
[not found] ` <525572FE.5080805-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2013-10-09 15:52 ` Sebastian Riemer
[not found] ` <52557BCF.6030302-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
2013-10-09 16:51 ` Hal Rosenstock
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