I just wrote a wrapper around open mpi in Go: https://github.com/emer/empi
Also, here's a set of random go bindings I found:
• https://github.com/yoo/go-mpi
• https://github.com/marcusthierfelder/mpi
• https://github.com/JohannWeging/go-mpi
Even a from scratch implementation:
• https://github.com/btracey/mpi
Also a few libraries for using infiniband directly:
• https://github.com/Mellanox/rdmamap
• https://github.com/jsgilmore/ib
• https://github.com/Mellanox/libvma
Some discussion: https://groups.google.com/forum/#!topic/golang-nuts/t7Vjpfu0sjQ
- Randy
> On Sep 14, 2020, at 3:25 AM, Samuel Lampa <samuel.la...@gmail.com> wrote:
>
> On Thursday, June 11, 2015 at 2:53:36 PM UTC+2 Egon wrote:
> 1. In which cases a cluster of say 4 (or 10 or 100 for instance) Raspberry Pi
> mini computers can be more cost-effective than a single computer with the
> same amount of cores (does the cost of communicating the data between the
> computers via the network not outweigh the fact that they car run tasks
> simultaneously) ?
>
> The general answer is Amdahl's Law
> (http://en.wikipedia.org/wiki/Amdahl%27s_law), of course it's not always
> applicable
> (http://www.futurechips.org/thoughts-for-researchers/parallel-programming-gene-amdahl-said.html).
> When moving things to multiple-computers you'll get a larger overhead in
> communication when compared to a single-computer, at the same time you may
> reduce resource-contention for disk, RAM (or other resources). So depending
> where your bottlenecks are, it could go either way...
>
> Yes, and also note that super-computers often use special network
> protocols/technologies which support so called "Remote direct memory access"
> (RDMA) [1], such as Infiniband [2], to get acceptable performance for
> high-performance multi-core computations across compute nodes. Infiniband
> cards are pretty expensive as far as I know, so will probably outweigh the
> benefits of buying a lot of RPis.
>
> I'd still be interested to hear if anybody knows about new developments on
> MPI for Go (for HPC use cases if nothing else)? :)
>
> [1] https://en.wikipedia.org/wiki/Remote_direct_memory_access
> [2] https://en.wikipedia.org/wiki/InfiniBand
>
> Best
> Samuel
>
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