Speed Up Your Simulations with Parallel Processing

monnet

看到SimWe上有不少人对COMSOL的并行心存疑虑，重新翻到COMSOL News 2008里COMSOL技术支持Linus Andersson先生的一篇文章，希望对大家对大问题的计算有帮助。

The more processors you use for computing, the quicker your simulations run. By allowing for multicore processing of your COMSOL Multiphysics models, you can achieve a significant speedup in 3D meshing, assembly, and solving. Here are some tips to help you better leverage your multicore platform for multiphysics modeling.

To run COMSOL Multiphysics with multicore processor support on Linux or Sun platforms, use the command:
comsol -np n
Where n is the number of processor cores you want to use.

In Windows, COMSOL Multiphysics will use all available cores by default. You can use the same command if you want to reserve some cores for a separate COMSOL session or for other tasks.
In a multicore environment, COMSOL distributes meshing between cores subdomain by subdomain. To maximize performance, use more subdomains than the physics of your model would otherwise dictate. Say, for instance, that you have a quad-core processor, and you would like to speed up the meshing process in a model with a complex geometry but nominally only one subdomain. Try splitting the geometry into four subdomains, each with similar size and complexity, and then do your meshing.
In the solution process, the degree of parallelization mostly depends on which solver you use. Generally, the solver that benefits most from multicore processing is the PARDISO direct solver. All iterative solvers and smoothers except Incomplete LU are also parallelized.

monnet

Freedom, such as this static micromixer, benefit greatly from multicore parallel processing.

monnet

大致意思是，可以用comsol -np n命令控制多核的使用，不过COMSOL缺省就是使用所有的核心来计算。同时，有几颗核心，最好将几何图形分割为核心的倍数。例如，你有8颗CPU核心，几何图形的subdomain分割为8个或者16个，这样更方便CPU的调用。

monnet

原文PDF下载：

monnet

精辟！完全合理的好帖，期待继续整理!!!  
太有逻辑性了，不得不顶，不知楼主是不是也写书啊 !!!!!

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monnet总是这么幽默

piting198379

正想了解一下并行计算

feasky

精辟！完全合理的好帖，期待继续整理!!!  
太有逻辑性了，不得不顶，不知楼主是不是也写书啊 !!!!!

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monnet总是这么幽默
monnet 发表于 2009-8-5 09:45

高，实在是高，不过帖子不错！