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Jacobi Parallel

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Jacobi Parallel, using threads

chuck87	4 Jun, 2008 - 08:33 AM Post #1
D.I.C Head Joined: 7 Sep, 2007 Posts: 65 My Contributions	My assignment is the heat distribution in a room that will be calculated with the Jacobi algorithm 1)As shown in the picture attached i have to use threads.If my array is 400x400 I will use 199 threads. Should I use so many threads?? 2) I know that the execution of some threads must be blocked by other threads.When should these blocks happen? Well my second question is my greatest concern so if anyone could give me a hint I will be really grateful parallel.bmp ( 487.9k ) Number of downloads: 32
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1lacca	4 Jun, 2008 - 08:50 AM Post #2
code.rascal Joined: 11 Aug, 2005 Posts: 3,822 Thanked 11 times My Contributions	It depends how many threads your system can process at once. If it can run 199, then it is fine. Otherwise, there are two possibilities: - they are prioritized in a way, so they run after each other without much switching. this way it is only a waste of space for the administration of threads - they all try to run at once, and a lot of switching is going on: this will trash performance as well, because of the overhead that comes with the switching Bottom line: usually it is not worth creating much more threads than your system can run at once. Regarding the second question: blocks usually happen at two points: - when a thread is waiting for the result of another - when several threads use the same resource (memory, device, whatever), so they are waiting for the other to finish
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