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Showing results 1 to 8 of 8 Search took 0.00 seconds. Search: Posts Made By: sbaffini

Forum: Main CFD Forum May 21, 2022, 19:58

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini AMG can be implemented in several ways, this must... AMG can be implemented in several ways, this must be clear. What amg roughly does is to combine together multiple equations following certain rules, solve the resulting smaller system and put...

Forum: Main CFD Forum May 21, 2022, 19:25

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini There are different, possibly overlapping,... There are different, possibly overlapping, reasons for this, which are just as good as your explanation. So yes, in the original system (the one you would solve serially) each equation depends from...

Forum: Main CFD Forum May 21, 2022, 19:15

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini Let's leave out of the terminology the case of... Let's leave out of the terminology the case of block systems, where you have multiple coupled equations solved at the same time and focus on a single scalar. Both in serial and in parallel, a...

Forum: Main CFD Forum May 21, 2022, 18:54

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini An additional thing you might want to do, even if... An additional thing you might want to do, even if it formally introduces variations when running with different number of processes, is to split the linear iterations between two groups: those...

Forum: Main CFD Forum May 21, 2022, 18:44

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini It is the correct approach only in the fact that... It is the correct approach only in the fact that you start by splitting the domain just like in the explicit case. You made a wrong assumption in that you can solve each sub-problem independently,...

Forum: Main CFD Forum February 12, 2022, 08:46

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini Let me give you a practical example. When... Let me give you a practical example. When you need to write a solution to file you can proceed in 3 different ways (according to my experience): 1) Each process writes its own file, then one...

Forum: Main CFD Forum February 12, 2022, 06:33

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini First of all, in case of doubts, let me clarify... First of all, in case of doubts, let me clarify that this really applies to distributed computing. Let's say that the total problem size is N and the total number of processes is P. Memory wise,...

Forum: Main CFD Forum February 11, 2022, 17:42

Replies: 18 how to develop code that scales well without having access to supercomputers? Views: 726 Posted By sbaffini For memory, do not allocate anything scaling with... For memory, do not allocate anything scaling with total number of processes (nor total problem size, of course). For algorithms, as well, avoid anything scaling linearly with the number of processes...

Showing results 1 to 8 of 8

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