Precise definition of "MPI_THREAD_SERIALIZED"

Asked Oct 16 '16 at 22:04

Active Oct 16 '16 at 22:04

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Since MPI_THREAD_MULTIPLE is not as perform and stable as MPI_THREAD_SERIALIZED, I am trying to convert my MPI application to serialized. However, the exact definition of MPI_THREAD_SERIALIZED is not clear to me. Does it mean:

Start and the end of any MPI call should not overlap with other calls?

or 2. Start of any MPI call should not overlap with other calls. (But two calls can still be overlapped)

If the former is the case, how to implement multi-threaded applications with long-lasting blocking APIs such as MPI_Comm_accept, MPI_Win_fence?

An example will be a DPM application waiting for clients to serve.

asked Oct 16 '16 at 22:04

xldrx

2

The first one is correct. You need your own means of assuring this. – Vladimir F Героям слава Oct 16 '16 at 23:32
`MPI_THREAD_SERIALIZED` basically means that in the parallel part of your program you have to wrap each and every call to MPI in one globally shared critical section. – Hristo Iliev Oct 17 '16 at 11:05

Precise definition of "MPI_THREAD_SERIALIZED"

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