From: Arnout Vandecappelle <arnout@mind.be>
To: xenomai@xenomai.org
Subject: [Xenomai] CPU occupation without context switches?
Date: Tue, 22 May 2012 18:09:09 +0200 [thread overview]
Message-ID: <4FBBBA25.5010308@mind.be> (raw)
Hoi,
After a few minutes of running my application, I see this:
# cat /proc/xenomai/stat
CPU PID MSW CSW PF STAT %CPU NAME
1 828 22 65 0 00300182 9.8 bench_RTnet_scope_thread_loop
1 839 2 46627538 0 00300186 53.8 bench_RTnet
...
i.e. the bench_RTnet_scope_thread_loop takes 10% CPU but no
context switches. How is this possible? I've looked at the
source code and can't find an explanation: when the exectime
accounting is updated, the csw is incremented as well (in
__xnpod_schedule()).
I'm asking because I can't find a reason why this thread should
occupy 10% of the CPU, so I'm wondering if there's something wrong
with the accounting instead.
BTW this is on Xenomai 2.5.6, on an SMP x86 with affinity=0x01.
Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286540
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F
next reply other threads:[~2012-05-22 16:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 16:09 Arnout Vandecappelle [this message]
2012-05-22 18:17 ` [Xenomai] CPU occupation without context switches? Gilles Chanteperdrix
2012-05-22 19:44 ` Philippe Gerum
2012-05-23 8:31 ` Arnout Vandecappelle
2012-05-23 8:45 ` Philippe Gerum
2012-05-23 9:37 ` Philippe Gerum
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