Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!boulder!schwartz@latour.colorado.edu
From: schwartz@latour.colorado.edu (Michael Schwartz)
Newsgroups: comp.unix.questions
Subject: disk I/O priorities
Message-ID: <10786@boulder.Colorado.EDU>
Date: 16 Aug 89 16:45:29 GMT
Sender: news@boulder.Colorado.EDU
Reply-To: schwartz@latour.colorado.edu (Michael Schwartz)
Organization: University of Colorado, Boulder
Lines: 10

I notice that when I run a process "niced", only the CPU priority seems
to be effected.  If the process starts heavily accessing the disk and
gets a large number of disk I/O requests into the queue before a higher
prio process runs, the higher prio process gets blocked for a long time
in a disk wait state, suggesting that its disk I/O requests are going
into the queue after the lower prio process' requests.  Does anyone
know if there's a way to prevent this behavior?  Thanks
 - Mike Schwartz
   Dept. of Computer SCience
   U. Colorado - Boulder