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Re: Support for SIGSTOP/SIGCONT in nice?

From: Jim Meyering
Subject: Re: Support for SIGSTOP/SIGCONT in nice?
Date: Wed, 29 Mar 2006 16:33:14 +0200

Simon Josefsson <address@hidden> wrote:
> 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.
> 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.
> Would it be useful to consider extending nice so it can send SIGSTOP
> and SIGCONT signals in configurable intervals?  Having rsync run for
> 30 seconds, sleep for 15, run for 30 seconds, etc, seem to avoid
> slowing down the system to unusable levels.

Hi Simon,

Have you already tried using rsync's existing option to limit bandwidth?

  rsync --bwlimit=500 ...

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