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From: Andrea Acquaviva <aacquaviva@deis.unibo.it>
To: "ecos-discuss@sources.redhat.com" <ecos-discuss@sources.redhat.com>
Subject: [ECOS]thread switch frequency
Date: Fri, 20 Apr 2001 01:59:00 -0000	[thread overview]
Message-ID: <3ADFFA65.CC964CFF@deis.unibo.it> (raw)

Hi,
I have a question about eCos mlqueue scheduler.
If there are two threads (making a matrix multiplication), running with
the same priority, they switch with a frequency given by:

f_clock/CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS,

where f_clock in the case of strongarm1110 (assabet) is 3.6864MHz.

Is this correct or is there something else that affects the switching
frequency?
My question arises because I observed a mismatch between the switch time
overhead calculated by tm_basic test and the one that I measured by
evaluating the execution time of the two thread mentioned above (that
is, is much less than expected).

Thanks!
Andrea.


--
Ing. Andrea Acquaviva
D.E.I.S. - Universita' di Bologna
V.le Risorgimento, 2    40136 BOLOGNA (ITALY)
Tel: (+39) 051 20 93787 Fax: (+39) 051 2093786



             reply	other threads:[~2001-04-20  1:59 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-04-20  1:59 Andrea Acquaviva [this message]
2001-04-20  2:23 ` Jonathan Larmour

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