Ralph, thanks for the reply. If I build with enable-heterogeneous and then decide to run on a homogeneous set of nodes, does the additional "overhead" go away or become completely negligible; i.e., if no conversion is necessary.
David On Thu, 2010-10-07 at 15:17 -0600, Ralph Castain wrote: > Hetero operations tend to lose a little performance due to the need to > convert data, but otherwise there is no real negative. We don't do it > by default solely because the majority of installations don't need to, > and there is no reason to lose even a little performance if it isn't > necessary. > > > If you want an application to be able to span that mix, then you'll > need to set that configure flag. > > On Thu, Oct 7, 2010 at 1:44 PM, David Ronis <david.ro...@mcgill.ca> > wrote: > I have various boxes that run openmpi and I can't seem to use > all of > them at once because they have different CPU's (e.g., > pentiums, athlons > (both 32 bit) vs Intel I7 (64 bit)). I'm about the build > 1.4.3 and was > wondering if I should add --enable-heterogenous to the > configure flags. > Any advice as to why or why not would be appreciated. > > David > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > >
