Re: [Patch][RFC] Disabling per-tgid stats on task exit in taskstats

Andrew Morton
2006-06-28T21:50:24Z

Jay Lan <jlan@engr.sgi.com> wrote:
>
> Testing with all delay-accounting patches as been in your 2.6.27-mm3
> tree as of 6/26 afternoon (ie, including the send-tgid-once, and
> avoid-sending-without-listeners patches), i do not see measurable
> performance difference with and without tgid processing when the
> exit rate was controlled to around 1000 exit/sec.
>
> As a result i am OK to not include a design of a system-wise
> init-time configuration option (for per-thread group data processing)
> in the taskstats interface.

Sounds good, thanks.

> The ENOBUFS i experienced in my testing would start to happen
> when exit rate at around 14000 exits/sec. While our fields confirmed
> that a 1000 threads exit/sec was a real, i have no reason to be
> concerned of 14000 exits/sec rate. ;)

1000 exits/sec/CPU can happen. How many CPUs did that machine have?