Re: [Boost-mpi] BOOST_MPI_HOMOGENEOUS

Subject: Re: [Boost-mpi] BOOST_MPI_HOMOGENEOUS
From: Matthias Troyer (troyer_at_[hidden])
Date: 2015-04-16 14:22:49

Hi Alain,

Indeed, since most environments nowadays are homogeneous we can set in on by default, but should put a warning into the documentation.

Matthias

> On 16 Apr 2015, at 15:53, Alain Miniussi <alain.miniussi_at_oca.eu> wrote:
> 
> 
> Hi,
> 
> What is the rationale for not having BOOST_MPI_HOMOGENEOUS set by default ?
> 
> It seems to be the most common case for HPC and the underlying assumption for MPI implementations.
> 
> Intel says: "use at your own risk"
> https://software.intel.com/en-us/articles/using-the-intel-mpi-library-on-a-heterogeneous-network
> 
> open MPI not by default:
> --enable-heterogeneous  Enable features required
> 			for heterogeneous platform
>                        support (default: disabled)
> 
> 
> I have seen quite a few installation on HPC facilities that had heterogeneous config on and I suspect testing is usually made on default configuration.
> 
> Plus, since Boost.MPI uses plain MPI (as opposed to serialization library) on simple types, it is probably unlikely that it will work on heterogeneous environment without extra care.
> 
> Is there any objection in setting BOOST_MPI_HOMOGENEOUS on by default ?
> 
> Thanks
> 
> -- 
> ---
> Alain
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