Re: [tip:tracing/core] ring-buffer benchmark: Run producer/consumer threads at nice +19

Steven Rostedt
2009-11-24T14:16:43Z

On Mon, 2009-11-23 at 07:15 +0000, tip-bot for Ingo Molnar wrote:
> Commit-ID: 98e4833ba3c314c99dc364012fba6ac894230ad0
> Gitweb: http://git.kernel.org/tip/98e4833ba3c314c99dc364012fba6ac894230ad0
> Author: Ingo Molnar <mingo@elte.hu>
> AuthorDate: Mon, 23 Nov 2009 08:03:09 +0100
> Committer: Ingo Molnar <mingo@elte.hu>
> CommitDate: Mon, 23 Nov 2009 08:03:09 +0100
>
> ring-buffer benchmark: Run producer/consumer threads at nice +19
>
> The ring-buffer benchmark threads run on nice 0 by default, using
> up a lot of CPU time and slowing down the system:
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 1024 root 20 0 0 0 0 D 95.3 0.0 4:01.67 rb_producer
> 1023 root 20 0 0 0 0 R 93.5 0.0 2:54.33 rb_consumer
> 21569 mingo 40 0 14852 1048 772 R 3.6 0.1 0:00.05 top
> 1 root 40 0 4080 928 668 S 0.0 0.0 0:23.98 init
>
> Renice them to +19 to make them less intrusive.

Ingo, that is the point of a benchmark!

This module is not made to be run all the time. I know you do it for
testing. But running it at lowest priority kills the reason this module
was made in the first place!

-- Steve