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

Nick Piggin
2006-06-29T18:06:00Z

Paul Jackson wrote:
>>You're probably correct on that model. However, it all depends on the actual
>>workload. Are people who actually have large-CPU (>256) systems actually
>>running fork()-heavy things like webservers on them, or are they running things
>>like database servers and computations, which tend to have persistent
>>processes?
>
>
> It may well be mostly as you say - the large-CPU systems not running
> the fork() heavy jobs.
>
> Sooner or later, someone will want to run a fork()-heavy job on a
> large-CPU system. On a 1024 CPU system, it would apparently take
> just 14 exits/sec/CPU to hit this bottleneck, if Jay's number of
> 14000 applied.

Half the CPUs in that system are probably going to be several
router hops away, won't they? I'll take a guess and say they're
an order of magnitude too optimistic for such a system ;)

--
SUSE Labs, Novell Inc.
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