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mpidistributed-computingopenmpi
stokastik
stokastik

Reputation: 81

Dynamic nodes in OpenMPI

In MPI, is it possible to add new nodes after it is started? For example, I have 2 computers already running a parallel MPI application. I start another instance of this application on a third computer and add it to the existing communicator. All computers are in a local network.

Upvotes: 5

Views: 1531

Answers (2)

qsc
qsc

Reputation: 512

It is possible for a MPI2 program to spawn new ranks. The function is MPI_Comm_spawn and it starts up children on a new MPI communicator. That is to say the new ranks have a different MPI_COMM_WORLD from the previously running ranks. It should be possible to make a new communicator that contains all of the current running ranks though.

Upvotes: 1

Steve Blackwell
Steve Blackwell

Reputation: 5924

No, it's not currently possible to add new nodes to a running MPI application. MPI is designed to know the total number of nodes when the program starts.

Work is being done (on MPI-3, for example) on handling nodes that go down. Maybe if you can add faulty nodes back, then you can add new ones, but that's the closest thing I can think of. See this answer for more info on approaches to MPI fault tolerance.

Upvotes: 2

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