[mvapich-discuss] handling of RDMA_CM_EVENT_REJECTED event in MVAPICH2-1.2p1

[Hari Subramoni]

Hi Polk,

I'm sorry about saying that the job will be aborted. It will not get
aborted when we get a RDMA_CM_EVENT_REJECTED. My bad.

Rejecting the connection is done with the knowledge of the src/dest
process and is not due to some fault in the system.

We reject the connection only when the server and the client try to make a
connection to each other at the same time. In this secnario, the
connection request from the server process is rejected by the client.

Hope this clarifies.

Thx,
Hari.

On Wed, 12 Aug 2009, gossips J wrote:

> Hi Hari,
> thanks for the response.
>
> Yes, this event is considered as CONNECT_ERROR and task aborts but REJECT
> has no handling so it does nothing.
>
> Two question:
> 1. Why should task gets aborted on Connect Error event. As i can predict the
> side effect would be affecting other connections with same src-dst pair in
> data transfer operation.
>
> 2. What happens in case of Reject event? Mvapich simply has DEBUG_PRINT and
> break out of switch case.
>
> Thanks,
> Polk.
>
> On Tue, Aug 11, 2009 at 6:33 PM, Hari Subramoni <subramon at cse.ohio-state.edu
> > wrote:
>
> > Hi Polk,
> >
> > The RDMA_CM_EVENT_REJECTED event is being handled inside mvapich2-1.2p1.
> > On receiving this event, the task will abort.
> >
> > This is done in 'src/mpid/ch3/channels/mrail/src/gen2/rdma_cm.c' in the
> > function 'ib_cma_event_handler'.
> >
> > Please let us know if you have any further questions.
> >
> > Thx,
> > Hari.
> >
> > On Tue, 11 Aug 2009, gossips J wrote:
> >
> > > Hi,
> > >
> > > It looks like there is no handling for RDMA_CM_EVENT_REJECTED event in ""
> > > file.
> > >
> > > There has to be some sort of handling, isnt it?
> > >
> > > Is this feature (CM_REJECT) supported in mvapich2-1.2p1 over OFA???
> > >
> > > In current scenario mvapich2 simply stuck during such event since there
> > is
> > > no handling in MPI (mvapich2).
> > >
> > > Thoughts???
> > >
> > > Thanks,
> > > Polk.
> > >
> >
> >
>