On Apr 25, 2013, at 9:11 AM, Dave Love <d.l...@liverpool.ac.uk> wrote:
> Ralph Castain <r...@open-mpi.org> writes: > >> On Apr 24, 2013, at 8:58 AM, Dave Love <d.l...@liverpool.ac.uk> wrote: >> >>> "Elken, Tom" <tom.el...@intel.com> writes: >>> >>>>> I have seen it recommended to use psm instead of openib for QLogic cards. >>>> [Tom] >>>> Yes. PSM will perform better and be more stable when running OpenMPI >>>> than using verbs. >>> >>> But unfortunately you won't be able to checkpoint. >> >> True - yet remember that OMPI no longer supports checkpoint/restart >> after the 1.6 series. Pending a new supporter coming along > > As far as I can tell, lack of PSM checkpointing isn't specific to OMPI, > and I know people have resorted to verbs to get it. > > Dropped CR is definitely reason not to use OMPI past 1.6. [By the way, > the release notes are confusing, saying that DMTCP is supported, but CR > is dropped.] I'd have hoped a vendor who needs to support CR would > contribute, but I suppose changes just become proprietary if they move > the base past 1.6 :-(. Not necessarily > > For general information, what makes the CR support difficult to maintain > -- is it just a question of effort? Largely a lack of interest. Very few (i.e., a handful) of people around the world use it, and it is hard to justify putting in the effort for that small a user group. The person who did the work did so as part of his PhD thesis - he maintained it for a couple of years while doing a post-doc, but now has joined the "real world" and no longer has time. None of the other developers are employed by someone who cares. > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
