From: Tejun Heo <tj@kernel.org>
To: Deepawali Verma <dverma249@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Work queue questions
Date: Fri, 21 Sep 2012 12:27:20 -0700 [thread overview]
Message-ID: <20120921192720.GJ7264@google.com> (raw)
In-Reply-To: <CAHCeSFpa28d-7ruMKSw6z2EYKYN-5udVouUJOi4cnj4dPad-TA@mail.gmail.com>
On Fri, Sep 21, 2012 at 08:26:01PM +0100, Deepawali Verma wrote:
> kworker/u:1-21 [000] 110.964895: task_event: MYTASKJOB2381 XStarted
> kworker/u:1-21 [000] 110.964909: task_event: MYTASKJOB2381 Xstopped
> kworker/u:1-21 [000] 110.965137: task_event: MYTASKJOB2382 XStarted
> kworker/u:1-21 [000] 110.965154: task_event: MYTASKJOB2382 Xstopped
> kworker/u:5-3724 [000] 110.965311: task_event: MYTASKJOB2383 XStarted
> kworker/u:5-3724 [000] 110.965325: task_event: MYTASKJOB2383 Xstopped
>
> I have this one big task to whom I divided into small sub tasks. These
> are numbered 2381, 2382 and 2383, what was I expecting that task 2381,
> 2382, 2383 run in parallel. I have put start and stop markers here so
> that I can see how this concurrency managed work queue is distributing
> the load.
>
> I found that task no 2381 is started first and exited before starting
> task 2382 and so on. What I expected that it should start the three
> sub tasks in parallel, not one by one.
>
> Where is concurrency here?
If none of them blocks, there isn't much point in throwing more
threads at them. What are those thread doing?
Thanks.
--
tejun
next prev parent reply other threads:[~2012-09-21 19:27 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 17:35 Work queue questions Dinky Verma
2012-09-21 17:49 ` Tejun Heo
2012-09-21 18:30 ` Deepawali Verma
2012-09-21 18:35 ` Tejun Heo
2012-09-21 19:26 ` Deepawali Verma
2012-09-21 19:27 ` Tejun Heo [this message]
2012-09-21 19:35 ` Deepawali Verma
2012-09-21 19:40 ` Tejun Heo
2012-09-22 4:24 ` anish singh
2012-09-22 5:27 ` Daniel Taylor
2012-09-22 6:05 ` anish singh
2012-09-22 6:12 ` Tejun Heo
2012-09-22 6:18 ` Daniel Taylor
2012-09-24 7:25 ` Deepawali Verma
[not found] ` <CAK-9PRB7KvPNgcsXiNG08-7OdrkkNc2ushusXh9rVm93J0xcHA@mail.gmail.com>
[not found] ` <CAHCeSFqmeOkKySxMUXgtnev+HL-NC6MdmeuDYONymYaNczb7RA@mail.gmail.com>
2012-09-24 16:56 ` Deepawali Verma
2012-09-24 18:10 ` Tejun Heo
2012-09-24 19:57 ` Deepawali Verma
2012-09-24 20:08 ` Tejun Heo
2012-09-24 20:52 ` Deepawali Verma
2012-09-24 20:54 ` Tejun Heo
2012-09-25 3:05 ` anish singh
2012-09-24 17:07 ` Chinmay V S
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