From: "Petr Cervenka" <grugh@domain.hid>
To: xenomai-help <xenomai@xenomai.org>
Subject: [Xenomai-help] Slow sin function
Date: Thu, 14 Feb 2008 10:58:37 +0100 [thread overview]
Message-ID: <200802141058.2356@domain.hid> (raw)
In-Reply-To: <200802141055.1177@domain.hid>
Hello again.
I have another problem and I'm not sure if it is connected with Xenomai ,
but perhaps you already met similar problem.
Occasionally the math sin function takes an enormous amount of time
(400-450 us on Athlon A64 X2 4800+). When I detect this and make the sin function
call with the same parameter again, it takes the same (long) time. I
suspect that this function is for some values is unreasonably slow. I'll
try to capture some such values and post them here.
I don't remember such behavior before the transition to newer 64bit linux
distribution (Kubuntu 7.10 amd64 and kernel 2.6.24).
Petr Cervenka
next parent reply other threads:[~2008-02-14 9:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200802141029.19685@domain.hid>
[not found] ` <200802141055.1177@domain.hid>
2008-02-14 9:58 ` Petr Cervenka [this message]
2008-02-14 13:32 ` [Xenomai-help] Slow sin function Gilles Chanteperdrix
[not found] ` <200802141648.10545@domain.hid>
2008-02-14 16:05 ` Petr Cervenka
2008-02-14 17:27 ` Gilles Chanteperdrix
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