Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!lamaster
From: lamaster@ames.arc.nasa.gov (Hugh LaMaster)
Newsgroups: comp.arch
Subject: Re: Context Switch Time, A worst Case
Keywords: Context switch, register files, saving world
Message-ID: <17258@ames.arc.nasa.gov>
Date: 28 Oct 88 16:07:39 GMT
References: <4908@thorin.cs.unc.edu>
Reply-To: lamaster@ames.arc.nasa.gov.UUCP (Hugh LaMaster)
Organization: NASA Ames Research Center, Moffett Field, Calif.
Lines: 21

In article <4908@thorin.cs.unc.edu> davis@clocs.cs.unc.edu (Mark Davis) writes:

>In this condition, it switches context about 100 times per second (10
>times faster that required by quantum).  We have measured context
>switch time at about 1 ms (about the same as reported in literature).
>In this case, 10% of the time is spent switching context.  (This is

>
>

My question is, how much of this context switching time is due to saving
the hardware state (my guess is that this is small) relative to the cost
of going through the scheduler to figure out what the next process to
run is (probably large)?


-- 
  Hugh LaMaster, m/s 233-9,  UUCP ames!lamaster
  NASA Ames Research Center  ARPA lamaster@ames.arc.nasa.gov
  Moffett Field, CA 94035     
  Phone:  (415)694-6117