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Message-ID: <20120921192720.GJ7264@google.com> Date: Fri, 21 Sep 2012 12:27:20 -0700 From: Tejun Heo <tj@...nel.org> To: Deepawali Verma <dverma249@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Work queue questions 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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