I'd guess thesame thing as George - a race condition in the shutdown of the async thread...? I haven't looked at that code in a long log time to remember how it tried to defend against the race condition.
Sent from my PDA. No type good. On Jan 3, 2011, at 2:31 PM, "Eugene Loh" <eugene....@oracle.com> wrote: > George Bosilca wrote: > >> Eugene, >> >> This error indicate that somehow we're accessing the QP while the QP is in >> "down" state. As the asynchronous thread is the one that see this error, I >> wonder if it doesn't look for some information about a QP that has been >> destroyed by the main thread (as this only occurs in MPI_Finalize). >> >> Can you look in the syslog to see if there is any additional info related to >> this issue there? >> > Not much. A one-liner like this: > > Dec 27 21:49:36 burl-ct-x4150-11 hermon: [ID 492207 kern.info] hermon1: EQE > local access violation > >> On Dec 30, 2010, at 20:43, Eugene Loh <eugene....@oracle.com> wrote: >> >>> I was running a bunch of np=4 test programs over two nodes. Occasionally, >>> *one* of the codes would see an IBV_EVENT_QP_ACCESS_ERR during >>> MPI_Finalize(). I traced the code and ran another program that mimicked >>> the particular MPI calls made by that program. This other program, too, >>> would occasionally trigger this error. I never saw the problem with other >>> tests. Rate of incidence could go from consecutive runs (I saw this once) >>> to 1:100s (more typically) to even less frequently -- I've had 1000s of >>> consecutive runs with no problems. (The tests run a few seconds apiece.) >>> The traffic pattern is sends from non-zero ranks to rank 0, with root-0 >>> gathers, and lots of Allgathers. The largest messages are 1000bytes. It >>> appears the problem is always seen on rank 3. >>> >>> Now, I wouldn't mind someone telling me, based on that little information, >>> what the problem is here, but I guess I don't expect that. What I am >>> asking is what IBV_EVENT_QP_ACCESS_ERR means. Again, it's seen during >>> MPI_Finalize. The async thread is seeing this. What is this error trying >>> to tell me? >>> > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel
