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Re: Support for SIGSTOP/SIGCONT in nice?
From: |
Andreas Schwab |
Subject: |
Re: Support for SIGSTOP/SIGCONT in nice? |
Date: |
Wed, 29 Mar 2006 16:49:47 +0200 |
User-agent: |
Gnus/5.110003 (No Gnus v0.3) Emacs/22.0.50 (gnu/linux) |
Simon Josefsson <address@hidden> writes:
> Frequently when I want to run a long-running I/O-bound job (i.e.,
> rsync of the entire disk to a second disk) on a busy machine (i.e.,
> mail and web server), the load increases to ~10 from a normal <1.
Assuming you are running on Linux, this is because there are about 10
processes waiting for disk I/O.
> Using 'nice' doesn't help. I don't know why this is, but I suspect
> the kernel scheduler is sub-optimal for disk-bound jobs.
You probably want to change the I/O scheduling class for the process.
This can be done with ionice (which is Linux specific, included in the
util-linux package at least on SL 10.1).
Andreas.
--
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."
Re: Support for SIGSTOP/SIGCONT in nice?,
Andreas Schwab <=