Open MPI logo

Open MPI User's 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 users] OMPI Coll Framework and RDMA
From: Jingcha Joba (pukkimonkey_at_[hidden])
Date: 2013-06-07 01:35:15


Hi Pavel,

Does that mean, if there is a AllGatherV and assuming that every process
belongs to default comm, there will n-1 Queue Pair between the collecting
process and other processes ?
n = total number of MPI processes.

--
Joba
On Thu, Jun 6, 2013 at 3:37 PM, Shamis, Pavel <shamisp_at_[hidden]> wrote:
> Default implementation of collectives is based on PML (p2p layer) that is
> implemented on top of BTL.
> Consequently it laverages RDMA capabilities to some extend.
>
> Pavel (Pasha) Shamis
> ---
> Computer Science Research Group
> Computer Science and Math Division
> Oak Ridge National Laboratory
>
>
>
>
>
>
> On Jun 6, 2013, at 1:59 PM, Jingcha Joba <pukkimonkey_at_[hidden]<mailto:
> pukkimonkey_at_[hidden]>> wrote:
>
> Hi,
>
> I have a quick question.
>
> Is there an openib (in btl framework) equivalent in coll framework?
>
> I have an MPI application with gatherv and scatterv. I am wondering if I
> can leverage RDMA capabilities of the underlying Infiniband fabric.
>
>
> Thanks,
> --
> Joba
>
> _______________________________________________
> users mailing list
> users_at_[hidden]<mailto:users_at_[hidden]>
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>