Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!inria!imag!phb
From: phb@imag.imag.fr (Philippe Bernadat)
Newsgroups: comp.os.mach
Subject: Re: Mach context switch time
Message-ID: <6393@imag.imag.fr>
Date: 23 Oct 89 08:09:36 GMT
References: <2895@netcom.UUCP>
Reply-To: phb@imag.fr (Philippe Bernadat)
Organization: IMAG, University of Grenoble, France
Lines: 26

In article <2895@netcom.UUCP> hue@netcom.UUCP (Jonathan Hue) writes:
>
>The following program executes the loop 10000 times in 7.3 seconds on a
>NeXT.  Each time through the loop is 2 context switches, so this works
>out to 2740 context switches/sec, or 365us per context switch.
>

Running the same program on a NeXT and on a DS3100 I got the following numbers:


		elapsed time for 	context switch		context switch
		10,000 loops		time (usec)		per second

NeXT			7.6 			380			2,631
DS3100 (Mach 2.5)	2.3 			115			8,695


+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+  Philippe Bernadat
EMAIL: bernadat@ri.osf.fr            OSF Research Institute
PHONE: (33) 76 42 82 41              2 Avenue Vignate
FAX:   (33) 76 54 03 99              38610 Gieres      FRANCE
-- 
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+  Philippe Bernadat
EMAIL: bernadat@ri.osf.fr            OSF Research Institute
PHONE: (33) 76 42 82 41              2 Avenue Vignate
FAX:   (33) 76 54 03 99              38610 Gieres      FRANCE