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Has anyone here heard of Open MPI?

This is a discussion on Has anyone here heard of Open MPI? within the Tech Board forums, part of the Community Boards category; And if you have, should I start using it for any scientific applications I may want to write? I just ...

  1. #1
    Registered User MutantJohn's Avatar
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    Has anyone here heard of Open MPI?

    And if you have, should I start using it for any scientific applications I may want to write?

    I just want to know, did it make your life better and if it did, how did it do so? I just started reading up on it and it seems interesting but I'm not sure how it's going to help me specifically yet so I was curious about the people that it had​ helped.

  2. #2
    Epy
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    It's just yet another thing for parallel computing. It can span calculation across many computers. The CFD package Code_saturne uses it for this purpose. Personally I'd learn something else, like OpenCL.

  3. #3
    Master Apprentice phantomotap's Avatar
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    I just started reading up on it and it seems interesting but I'm not sure how it's going to help me specifically yet so I was curious about the people that it had​ helped.
    O_o

    If you don't think it is a fit for what problems you are trying to solve, it simply doesn't matter if it was a good fit for a different problem.

    You shouldn't reach for a specific flavor of tool for every problem just because you found a new tool.

    Soma
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    Registered User MutantJohn's Avatar
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    I really like that advice, phantom. Thank you.

    And I kind of already knew that it was useful for parallel computing but I guess what I really want to know is, how does it compare to std::thread and lambdas? Because as of now, those two things in tandem put multithreading on easy mode.

    So, how does std::thread compare for distributed systems? Let's say I wanted to yolo it and triangulate 5 billion points across something like 1024 processors using several terabytes of ram. Can I use C++ for distributed systems? I think Open MPI was a smart choice for other codes because it was built with sending data across a network.

    Plus, the website advertised it as "high-performance scientific code" which I was wondering about. If the reputation is good I'll consider learning it but as of now, I don't really feel a need for it. Libraries like Eigen and GMP are more of what I seem to need at the moment. God, I love Eigen. I know that's not really relevant but man, I love Eigen.

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    Master Apprentice phantomotap's Avatar
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    And I kind of already knew that it was useful for parallel computing but I guess what I really want to know is, how does it compare to std::thread and lambdas?
    O_o

    So you didn't read even one bit about "Open MPI" before deciding it might be something you need to seriously investigate as an alternative implementation strategy because of marketing blurb?

    Wow.

    Soma
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  6. #6
    Registered User MutantJohn's Avatar
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    Well, when you say it that way it just sounds sort of silly.

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    What phantomotap meant is, they are vastly different things that really aren't meant for the same tasks. If you actually read up on them, which one is better for any specific task should be obvious.

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