From mboxrd@z Thu Jan  1 00:00:00 1970
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
Message-id: <3ADFFA65.CC964CFF@deis.unibo.it>
X-SW-Source: 2001-04/msg00251.html

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