[mpich-discuss] MPI memory allocation.

[Anatoly G]

I think I need MPICH2, but not MPICH.
Does MPICH 3.0.4 includes all features of MPICH2?

Anatoly.


On Thu, Dec 5, 2013 at 12:00 PM, Reuti <reuti at staff.uni-marburg.de> wrote:

> Hi,
>
> Am 05.12.2013 um 09:58 schrieb Anatoly G:
>
> > I"m using MPICH2 1.5.
> > My system contains master and 16 slaves.
> > System uses number of communicators.
> > The single communicator used for below scenario:
> > Each slave sends non-stop 2Kbyte data buffer using MPI_Isend and waits
> using MPI_Wait.
> > Master starts with MPI_Irecv to each slave
> > Then in endless loop:
> > MPI_Waitany and MPI_Irecv on rank returned by MPI_Waitany.
> >
> > Another communicator used for broadcast communication (commands between
> master + slaves),
> > but it's not used in parallel with previous communicator,
> > only before or after data transfer.
> >
> > The system executed on two computers linked by 1Gbit/s Ethernet.
> > Master executed on first computer, all slaves on other one.
> > Network traffic is ~800Mbit/s.
> >
> > After 1-2 minutes of execution, master process starts to increase it's
> memory allocation and network traffic becomes low.
> > This memory allocation & network traffic slow down continues until fail
> of MPI,
> > without core file save.
>
> This might depend on the ulimit: core file size
>
>
> > My program doesn't allocate memory. Can you please explain this
> behaviour.
> > How can I cause MPI to stop sending slaves if Master can't serve such
> traffic, instead of memory allocation and fail?
>
> Can you please try with the latest MPICH 3.0.4 to check whether it behaves
> in the same way.
>
> -- Reuti
>
>
> > Thank you,
> > Anatoly.
> >
> > P.S.
> > On my stand alone test, I simulate similar behaviour, but with single
> thread on each process (master & hosts).
> > When I start stand alone test, master stops slaves until it completes
> accumulated data processing and MPI doesn't increase memory allocation.
> > When Master is free slaves continue to send data.
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