Open MPI logo

Open MPI Development Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

Subject: Re: [OMPI devel] Notes from mem hooks call today
From: Roland Dreier (rdreier_at_[hidden])
Date: 2008-05-28 19:09:42


> I think Patrick's point is that it's not too much more expensive to do the
> syscall on Linux vs just doing the cache lookup, particularly in the
> context of a long message. And it means that upper layer protocols like
> MPI don't have to deal with caches (and since MPI implementors hate
> registration caches only slightly less than we hate MPI_CANCEL, that will
> make us happy).

Stick in a separate library then?

I don't think we want the complexity in the kernel -- I personally would
argue against merging it upstream; and given that the userspace solution
is actually faster, it becomes pretty hard to justify.