Re: [OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-25 Thread George Bosilca
> On Apr 25, 2016, at 11:33 , Dave Love wrote: > > George Bosilca writes: > >> Dave, >> >> You are absolutely right, the parameters are now 6-7 years old, >> gathered on interconnects long gone. Moreover, several discussions in >> this mailing

Re: [OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-22 Thread Dave Love
George Bosilca writes: > Matthieu, > > If you are talking about how Open MPI selects between different broadcast > algorithms you might want to read [1]. We have implemented a dozen > different broadcast algorithms and have run a set of tests to measure their > performance.

Re: [OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-19 Thread George Bosilca
-- > *From:* users [users-boun...@open-mpi.org] on behalf of George Bosilca [ > bosi...@icl.utk.edu] > *Sent:* Tuesday, April 19, 2016 2:03 PM > *To:* Open MPI Users > *Subject:* Re: [OMPI users] MPI_Bcast implementations in OpenMPI > > Matthieu, > &

Re: [OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-19 Thread Dorier, Matthieu
Users Subject: Re: [OMPI users] MPI_Bcast implementations in OpenMPI Matthieu, If you are talking about how Open MPI selects between different broadcast algorithms you might want to read [1]. We have implemented a dozen different broadcast algorithms and have run a set of tests to measure

Re: [OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-19 Thread George Bosilca
Matthieu, If you are talking about how Open MPI selects between different broadcast algorithms you might want to read [1]. We have implemented a dozen different broadcast algorithms and have run a set of tests to measure their performance. We then used a quad tree clasiffication algorithm to

Re: [OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-19 Thread Jeff Squyres (jsquyres)
On Apr 15, 2016, at 9:18 AM, Dorier, Matthieu wrote: > > I'd like to know how OpenMPI implements MPI_Bcast. And if different > implementations are provided, how one is selected. This is a fairly complicated topic. This old paper is the foundation for how Open MPI works (it's

[OMPI users] MPI_Bcast implementations in OpenMPI

2016-04-15 Thread Dorier, Matthieu
Hi, I'd like to know how OpenMPI implements MPI_Bcast. And if different implementations are provided, how one is selected. Thanks, Matthieu Dorier