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Cluster parallel simulation #1817

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jiaduxie opened this issue Oct 28, 2020 · 1 comment
Closed

Cluster parallel simulation #1817

jiaduxie opened this issue Oct 28, 2020 · 1 comment
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@jarsi
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I: No breaking change Previously written code will work as before, no one should note anything changing (aside the fix) S: Normal Handle this with default priority T: Discussion Still searching for the right way to proceed / suggestions welcome

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@jiaduxie
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Hi,jarsi,I am now simulating a small network for testing on two machines, and run it with the following command. It seems that the two machines run by themselves without interaction,running your own.

mpirun.mpich -np 2 -host work0,work1 python ./multi_test.py

Can nest simulate a network in a multi-node cluster environment? If yes, how do the nodes exchange data?
@stinebuu stinebuu added I: No breaking change Previously written code will work as before, no one should note anything changing (aside the fix) S: Normal Handle this with default priority T: Discussion Still searching for the right way to proceed / suggestions welcome labels Oct 28, 2020
@jarsi
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jarsi commented Oct 28, 2020

Yes, NEST is very well capable of simulating networks in a multi-node environment. I guess your question is related to the question you poster in the multi-area model issues.

What you are describing should not happen. NEST should not run two independent copies which do not interact with each other. The copies should interact with each other and distribute the workload. Usually this should work out of the box when installing NEST with mpi support. It would be important to know what job scheduler your system runs. And what is inside the hostfiles?

@jiaduxie jiaduxie closed this as completed Nov 4, 2020
@stinebuu stinebuu mentioned this issue Nov 4, 2020
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I: No breaking change Previously written code will work as before, no one should note anything changing (aside the fix) S: Normal Handle this with default priority T: Discussion Still searching for the right way to proceed / suggestions welcome
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