Dear all, Dear Jeff,
I have three communicator:
the standard one:
MPI_COMM_WORLD
and other two:
MPI_LOCAL_COMM
MPI_MASTER_COMM
a sort of two-level MPI.
Suppose to have 8 threats,
I use 4 threats for run the same problem with different value. These are
the LOCAL_COMM.
In addition I have a MPI_MASTER_COMM to allow the master of each group to
communicate.
These give me some problem.
For example, I have to exit to a cycle, according to a check:
IF(counter.GE.npercstop*nParticles)THEN
flag2exit=1
WRITE(*,*) '-Warning PSO has been exit'
EXIT pso_cycle
ENDIF
But this is difficult to do since I have to exit only after all the threats
inside a set have finish their task.
Do you have some suggestions?
Do you need other information?
Really Really thanks
Diego
On 11 August 2018 at 14:03, Jeff Squyres (jsquyres) <jsquy...@cisco.com>
wrote:
> On Aug 10, 2018, at 6:27 PM, Diego Avesani <diego.aves...@gmail.com>
> wrote:
> >
> > The question is:
> > Is it possible to have a barrier for all CPUs despite they belong to
> different group?
> > If the answer is yes I will go in more details.
>
> By "CPUs", I assume you mean "MPI processes", right? (i.e., not threads
> inside an individual MPI process)
>
> Again, this is not quite a specific-enough question. Do the different
> groups (and I assume you really mean communicators) overlap? Are they
> disjoint? Is there a reason MPI_COMM_WORLD is not sufficient?
>
> There are two typical ways to barrier a set of MPI processes.
>
> 1. Write your own algorithm to do sends / receives -- and possibly even
> collectives -- to ensure that no process leaves the barrier before every
> process enters the barrier.
>
> 2. Make sure that you have a communicator that includes exactly the set of
> processes that you want (and if you don't have a communicator fitting this
> description, make one), and then call MPI_BARRIER on it.
>
> #2 is typically the easier solution.
>
> --
> Jeff Squyres
> jsquy...@cisco.com
>
>
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