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Re: Support for SIGSTOP/SIGCONT in nice?

From: Simon Josefsson
Subject: Re: Support for SIGSTOP/SIGCONT in nice?
Date: Wed, 29 Mar 2006 17:10:04 +0200
User-agent: Gnus/5.110004 (No Gnus v0.4) Emacs/22.0.50 (gnu/linux)

Andreas Schwab <address@hidden> writes:

> 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).

Thanks for the hint.  I couldn't find it in Debian, but some googling


ionice is part of the latest pre-releases.  Unfortunately, my kernel
on the system didn't support that syscall so it didn't work.


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