Question

i am currently building a small utility library as part of a larger project. OpenMPI has a well documented API library but i am a little puzzled when it comes to the lower level communication between nodes. I know that when writing your algorithm, you distribute it across all nodes that are expected to do the computation each communicating with the rest, executing portion of the algorithm based on their "global" MPI rank (as defined in the algorithm), and all the nodes synchronize back and forth. However, the reason i placed global in quotes is, does openMPI communicate on the ip level, hence say that i already have a long executing algorithm, but there is a node that is idling, not running any MPI processes, if i execute my MPI algorithm on it, will it join the MPI_COMM_WORLD and become part of the overall network topology or is there some "voodoo" i need to do to make that node part of the MPI_COMM_WORLD. also, if nodes can become part of MPI_COMM_WORLD for that particular algorithm, how can i register/identify this new node?

任何阅读引用也是有益的。

非常感谢!

tl; dr 可从 MPI_ COMM_WORLD 中获取 MPI 节点热线吗?

Answer 1

一旦通信器创建后, 您无法将节点加入到通信器中。对于只是预设的通信器的 < code> MPI_ COMM_ WORLD < /code> 来说, 也属于这种情况。只有作为SPMD 初始发射的一部分而启动的进程才成为 < code> MPI_ COMM_ WORLD 的一部分。但是, 您可以使用MPI-2 进程管理设施生成额外的进程, 详情见 http://www.mpi-forum.org/docs/mpi22-report/node201.htm" rel=“nofollow” > 10章 < /a] 当前 MPI Standard 2. 2 版本第10版描述的章 < href=" 。

新产卵过程有自己的 MPI_COMM_WORLD ,初始组别的过程只能通过一个特殊的 < strong > intercommunictor ( MPI_COMM_WORLD 是 < strong > intercommunication ) 来与它们沟通。由于产卵作业返回的产卵过程是一个集体操作,因此,由于产卵过程是一个集体操作,因此 MPI_COMM_WORLD 中的所有过程都将获得该相互连接器的把手。

MPI 3.0 (当它迟早退出时) 将带来断层容度, 从而可以排除/ 消除 < code> MPI_ COMM_ WORLD (或任何其他通讯器) 的错误过程, 而 MPI 3. 1 最终将带来能够替换错误过程的东西。

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