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2 basic problems [message #25034 is a reply to message #24910]

Mon, 08 February 2010 22:29

kohait00 is currently offline

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

hi mirek,

i am still thinking about the WorkQueue.. there is 1 basic problem to face:

* how to ensure that the common thread pool does not execute more than X jobs from a specific CoWork instace in parallel. since the pool does not care about sequencing relative to a CoWork instance. (restrict the global pool itself is no option, this would affect other CoWorks with proper different constraints)

the threads serve themselves from a global job queue. if we i.e say, only X=1 task from all the tasks commited to a certain CoWork may execute at once, other threads would still dequeue and execute jobs, since they dont care.

any idea? to make a per CoWork queue, which then really submits to the global queue?

i mean the following:
task A1 is executing in a thread from pool. task A2 (related to A1, may not intersect it) is also posted there, but may not execute, before A1 is done, meanwhile any other thread from pool finishes, dequeues A2 task, checks and realizes that A1 is still running, and it may not execute it. what to do with the job? the thread may not wait, it would block work of other CoWorks, post the job back to queue is not reliable, other related tasks might have been posted meanwhile. results in desorder.

seems as here we come close to a scheduler Smile

Smile

[Updated on: Mon, 08 February 2010 22:47]

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[Message index]

		what about WorkQueue : public CoWork By: kohait00 on Wed, 03 February 2010 07:26
		Re: what about WorkQueue : public CoWork By: koldo on Wed, 03 February 2010 08:22
		Re: what about WorkQueue : public CoWork By: kohait00 on Wed, 03 February 2010 08:58
		first, CoWork.h and CoWork.cpp cleanups By: kohait00 on Wed, 03 February 2010 12:07
		WorkQueue By: kohait00 on Wed, 03 February 2010 12:14
		Re: what about WorkQueue : public CoWork By: mirek on Wed, 03 February 2010 12:36
		Re: what about WorkQueue : public CoWork By: kohait00 on Wed, 03 February 2010 13:31
		changed CoWork and derived WorkQueue By: kohait00 on Wed, 03 February 2010 15:03
		Re: changed CoWork and derived WorkQueue By: mirek on Wed, 03 February 2010 15:08
		Re: changed CoWork and derived WorkQueue By: kohait00 on Wed, 03 February 2010 15:14
		Re: changed CoWork and derived WorkQueue By: mirek on Wed, 03 February 2010 20:45
		Re: changed CoWork and derived WorkQueue By: kohait00 on Wed, 03 February 2010 21:58
		2 basic problems By: kohait00 on Mon, 08 February 2010 22:29
		Re: changed CoWork and derived WorkQueue By: mirek on Tue, 09 February 2010 10:56
		Re: changed CoWork and derived WorkQueue By: kohait00 on Tue, 09 February 2010 15:14
		Re: changed CoWork and derived WorkQueue By: mirek on Mon, 15 February 2010 12:49
		Re: changed CoWork and derived WorkQueue By: kohait00 on Tue, 16 February 2010 14:44
		BUGFIX to WorkQueue By: kohait00 on Thu, 18 February 2010 16:02
		Re: BUGFIX to WorkQueue By: kohait00 on Fri, 19 February 2010 08:47

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