From: Francis.Giraldeau@USherbrooke.ca (Francis Giraldeau)
Subject: [ltt-dev] Experiments on CPU time statistics
Date: Thu, 11 Nov 2010 16:05:18 -0500 [thread overview]
Message-ID: <20101111160518.258760q9al0bhgw8@www.usherbrooke.ca> (raw)
In-Reply-To: <20101111185944.GA27102@Krystal>
Mathieu Desnoyers <compudj at krystal.dyndns.org> a ?crit?:
>> =================================================
>> trace-bonnie.sh : start bonnie++ process for 10s
>>
>> time statistics:
>> real 0m10.715s
>> user 0m0.420s
>> sys 0m6.350s
>>
>>
>> lttv statistics:
>> events count : 11088588
>> cpu time : 80.051904112
>
> cpu time should be good. How many cores does you machine have ? 8 ?
Thanks for explainations. Yes, the system has 8 cores. The maximum CPU
time for 1 second is hence 8 seconds.
>> =================================================
>> sleep 1s : start a sleep of 1s
>>
>> time statistics:
>> real 0m1.002s
>> user 0m0.000s
>> sys 0m0.000s
>>
>>
>> lttv statistics:
>> cpu time : 7.841686487
How then can we explain that on an idle system, the CPU time is yet
(almost) the number of CPUs times the trace duration?
Cheer,
Francis
prev parent reply other threads:[~2010-11-11 21:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-11 17:50 Francis Giraldeau
2010-11-11 18:59 ` Mathieu Desnoyers
2010-11-11 19:23 ` Michel Dagenais
2010-11-11 21:05 ` Francis Giraldeau [this message]
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