From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: suresh reddy <sureshreddy.balijepalli@domain.hid>
Cc: Xenomai help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] Hanging
Date: Thu, 25 Aug 2011 19:57:16 +0200 [thread overview]
Message-ID: <4E568CFC.2050203@domain.hid> (raw)
In-Reply-To: <CAL+uwv8La8ad9Vc8HZYhvgMyWb0=5r5-X1yy1aDKJ-jauJgESw@domain.hid>
On 08/25/2011 11:25 AM, suresh reddy wrote:
> Dear Giles,
It is Gilles.
>
> 1. taking timing results using rt_timer-tsc on pandaboard for a test program
> using xenomai native services.
>
> 2. taking timing results using gettimeofday on pandaboard for same test
> program using linuxthreads.
>
>
> Can i compare these two timing results ?
your system is likely using nptl, not linuxthreads. And clock_gettime
instead of gettimeofday will give you precision down to the nanosecond,
like rt_timer_tsc2ns.
But yes, you can compare the results, if you bear in mind that real-time
is about worst case latencies, so results obtained by running tests for
a few seconds or minutes on an idle machine are meaningless.
Also note that since Xenomai has a posix api, you can have the exact
same code running with and without xenomai.
--
Gilles.
next prev parent reply other threads:[~2011-08-25 17:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-24 10:51 [Xenomai-help] Hanging suresh reddy
2011-08-24 12:13 ` Gilles Chanteperdrix
2011-08-24 12:35 ` suresh reddy
2011-08-24 12:59 ` Gilles Chanteperdrix
2011-08-24 14:12 ` suresh reddy
2011-08-24 16:28 ` Gilles Chanteperdrix
2011-08-25 9:25 ` suresh reddy
2011-08-25 17:57 ` Gilles Chanteperdrix [this message]
2011-08-25 18:18 ` suresh reddy
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