On Apr 25, 2013, at 9:11 AM, Dave Love <d.love_at_[hidden]> wrote:
> Ralph Castain <rhc_at_[hidden]> writes:
>> On Apr 24, 2013, at 8:58 AM, Dave Love <d.love_at_[hidden]> wrote:
>>> "Elken, Tom" <tom.elken_at_[hidden]> writes:
>>>>> I have seen it recommended to use psm instead of openib for QLogic cards.
>>>> 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 :-(.
> 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.
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