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