From: Andrew Morton <akpm@osdl.org>
To: Shailabh Nagar <nagar@watson.ibm.com>
Cc: hadi@cyberus.ca, pj@sgi.com, Valdis.Kletnieks@vt.edu,
jlan@engr.sgi.com, balbir@in.ibm.com, csturtiv@sgi.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [Patch][RFC] Disabling per-tgid stats on task exit in taskstats
Date: Thu, 29 Jun 2006 18:05:02 -0700 [thread overview]
Message-ID: <20060629180502.3987a98e.akpm@osdl.org> (raw)
In-Reply-To: <44A47285.6060307@watson.ibm.com>
Shailabh Nagar <nagar@watson.ibm.com> wrote:
>
> The rates (or upper bounds) that are being discussed here, as of now,
> are 1000 exits/sec/CPU for
> 1024 CPU systems. That would be roughly 1M exits/system *
> 248Bytes/message = 248 MB/sec.
I think it's worth differentiating between burst rates and sustained rates
here.
One could easily imagine 10,000 threads all exiting at once, and the user
being interested in reliably collecting the results.
But if the machine is _sustaining_ such a high rate then that means that
these exiting tasks all have a teeny runtime and the user isn't going to be
interested in the per-thread statistics.
So if we can detect the silly sustained-high-exit-rate scenario then it
seems to me quite legitimate to do some aggressive data reduction on that.
Like, a single message which says "20,000 sub-millisecond-runtime tasks
exited in the past second" or something.
next prev parent reply other threads:[~2006-06-30 1:02 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-09 7:41 Shailabh Nagar
2006-06-09 8:00 ` Andrew Morton
2006-06-09 10:51 ` Balbir Singh
2006-06-09 11:21 ` Andrew Morton
2006-06-09 13:20 ` Shailabh Nagar
2006-06-09 18:25 ` Jay Lan
2006-06-09 19:12 ` Shailabh Nagar
2006-06-09 15:36 ` Balbir Singh
2006-06-09 18:35 ` Jay Lan
2006-06-09 19:31 ` Shailabh Nagar
2006-06-09 21:56 ` Shailabh Nagar
2006-06-09 22:42 ` Jay Lan
2006-06-09 23:22 ` Andrew Morton
2006-06-09 23:47 ` Jay Lan
2006-06-09 23:56 ` Andrew Morton
2006-06-10 12:21 ` Shailabh Nagar
2006-06-12 18:31 ` Jay Lan
2006-06-12 21:57 ` Shailabh Nagar
2006-06-10 13:05 ` Shailabh Nagar
2006-06-12 18:54 ` Jay Lan
2006-06-21 19:11 ` Jay Lan
2006-06-21 19:14 ` Jay Lan
2006-06-21 19:34 ` Shailabh Nagar
2006-06-21 23:35 ` Jay Lan
2006-06-21 23:45 ` Shailabh Nagar
2006-06-23 17:14 ` Shailabh Nagar
2006-06-23 18:19 ` Jay Lan
2006-06-23 18:53 ` Shailabh Nagar
2006-06-23 20:00 ` Jay Lan
2006-06-23 20:16 ` Shailabh Nagar
2006-06-23 20:36 ` Jay Lan
2006-06-23 21:19 ` Andrew Morton
2006-06-23 22:07 ` Jay Lan
2006-06-23 23:47 ` Andrew Morton
2006-06-24 2:59 ` Shailabh Nagar
2006-06-24 4:39 ` Andrew Morton
2006-06-24 5:59 ` Shailabh Nagar
2006-06-26 17:33 ` Jay Lan
2006-06-26 17:52 ` Shailabh Nagar
2006-06-26 17:55 ` Andrew Morton
2006-06-26 18:00 ` Shailabh Nagar
2006-06-26 18:12 ` Andrew Morton
2006-06-26 18:26 ` Jay Lan
2006-06-26 18:39 ` Andrew Morton
2006-06-26 18:49 ` Shailabh Nagar
2006-06-26 19:00 ` Jay Lan
2006-06-28 21:30 ` Jay Lan
2006-06-28 21:53 ` Andrew Morton
2006-06-28 22:02 ` Jay Lan
2006-06-29 8:40 ` Paul Jackson
2006-06-29 12:30 ` Valdis.Kletnieks
2006-06-29 16:44 ` Paul Jackson
2006-06-29 18:01 ` Andrew Morton
2006-06-29 18:07 ` Paul Jackson
2006-06-29 18:26 ` Paul Jackson
2006-06-29 19:15 ` Shailabh Nagar
2006-06-29 19:41 ` Paul Jackson
2006-06-29 21:42 ` Shailabh Nagar
2006-06-29 21:54 ` Jay Lan
2006-06-29 22:09 ` Shailabh Nagar
2006-06-29 22:23 ` Paul Jackson
2006-06-30 0:15 ` Shailabh Nagar
2006-06-30 0:40 ` Paul Jackson
2006-06-30 1:00 ` Shailabh Nagar
2006-06-30 1:05 ` Paul Jackson
[not found] ` <44A46C6C.1090405@watson.ibm.com>
2006-06-30 0:38 ` Paul Jackson
2006-06-30 2:21 ` Paul Jackson
2006-06-30 2:46 ` Shailabh Nagar
2006-06-30 2:54 ` Paul Jackson
2006-06-30 3:02 ` Paul Jackson
2006-06-29 19:22 ` Shailabh Nagar
2006-06-29 19:10 ` Shailabh Nagar
2006-06-29 19:23 ` Paul Jackson
2006-06-29 19:33 ` Andrew Morton
2006-06-29 19:43 ` Shailabh Nagar
2006-06-29 20:00 ` Andrew Morton
2006-06-29 22:13 ` Shailabh Nagar
2006-06-29 23:00 ` jamal
2006-06-29 20:01 ` Shailabh Nagar
2006-06-29 21:22 ` Paul Jackson
2006-06-29 22:54 ` jamal
2006-06-30 0:38 ` Shailabh Nagar
2006-06-30 1:05 ` Andrew Morton [this message]
2006-06-30 1:11 ` Shailabh Nagar
2006-06-30 1:30 ` jamal
2006-06-30 3:01 ` Shailabh Nagar
2006-06-30 12:45 ` jamal
2006-06-30 2:25 ` Paul Jackson
2006-06-30 2:35 ` Andrew Morton
2006-06-30 2:43 ` Paul Jackson
2006-06-29 19:33 ` Jay Lan
2006-06-30 18:53 ` Shailabh Nagar
2006-06-30 19:10 ` Shailabh Nagar
2006-06-30 19:19 ` Shailabh Nagar
2006-06-30 20:19 ` jamal
2006-06-30 22:50 ` Andrew Morton
2006-07-01 2:20 ` Shailabh Nagar
2006-07-01 2:43 ` Andrew Morton
2006-07-01 3:37 ` Shailabh Nagar
2006-07-01 3:51 ` Andrew Morton
2006-07-03 21:11 ` Shailabh Nagar
2006-07-03 21:41 ` Andrew Morton
2006-07-04 0:13 ` Shailabh Nagar
2006-07-04 0:38 ` Andrew Morton
2006-07-04 20:19 ` Paul Jackson
2006-07-04 20:22 ` Paul Jackson
2006-07-04 0:54 ` Shailabh Nagar
2006-07-04 1:01 ` Andrew Morton
2006-07-04 13:05 ` jamal
2006-07-04 15:18 ` Shailabh Nagar
2006-07-04 16:37 ` Shailabh Nagar
2006-07-04 19:24 ` jamal
2006-07-05 14:09 ` Shailabh Nagar
2006-07-05 20:25 ` Chris Sturtivant
2006-07-05 20:32 ` Shailabh Nagar
2006-07-03 4:53 ` Paul Jackson
2006-07-03 15:02 ` Shailabh Nagar
2006-07-03 15:55 ` Paul Jackson
2006-07-03 16:31 ` Paul Jackson
2006-07-04 0:09 ` Shailabh Nagar
2006-07-04 19:59 ` Paul Jackson
2006-07-05 17:20 ` Jay Lan
2006-07-05 18:18 ` Shailabh Nagar
2006-06-30 22:56 ` Andrew Morton
2006-06-29 18:05 ` Nick Piggin
2006-06-29 12:42 ` Shailabh Nagar
2006-06-24 3:08 ` Shailabh Nagar
2006-06-21 20:38 ` Andrew Morton
2006-06-21 21:31 ` Shailabh Nagar
2006-06-21 21:45 ` Jay Lan
2006-06-21 21:54 ` Andrew Morton
2006-06-21 22:19 ` Jay Lan
2006-06-21 21:59 ` Shailabh Nagar
2006-06-09 15:55 ` Chris Sturtivant
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