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A fun scenario was proposed in the MPI Forum today. What do you think this code will do?
MPI_Comm comm, save;
MPI_Request req;
MPI_Init(NULL, NULL);
MPI_Comm_dup(MPI_COMM_WORLD, &comm);
MPI_Comm_rank(comm, &rank);
save = comm;
MPI_Isend(smsg, 4194304, MPI_CHAR, rank, 123, comm, &req);
MPI_Comm_free(&comm);
MPI_Recv(rmsg, 4194304, MPI_CHAR, rank, 123, save, MPI_STATUS_IGNORE);
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Last weekend, I was fortunate enough to be able to attend the Midwest Open Source Software Conference (MOSSCon 2013). I met some fascinating people, listened to some great talks, and learned a bunch of new things.
All in all, a win.
I also presented a talk on two things:
The slides that I presented are below (slightly edited from their original form; I used a few animations in my original slides, which don’t work on Slideshare):
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Tags: HPC, Linux, MOSSCon, mpi, Open MPI, open source, USNIC
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I’m very pleased to welcome a new member to the Cisco USNIC/MPI Team: Dave Goodell. Welcome, Dave! (today was his first day)
Dave joins us from the MPICH team at Mathematics and Computer Science division at Argonne National Laboratory.
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I was just recently informed that my talk was accepted at the Midwest Open Source Software Conference (MOSSCon). w00t!
MOSSCon will be held at the University of Louisville, in Louisville, Kentucky, USA, on May 18-19, 2013. It’s being organized by people from the Kentucky Open Source Society (KYOSS) and other open source / maker-oriented groups in Louisville and Ohio.
Tags: HPC, MOSSCon, mpi, open source
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In a prior blog post, I talked about latency analogies. I compared levels of latencies to your home, your neighborhood, a far-away neighborhood, and another city. I talked about these localities in terms of communication.
Let’s extend that analogy to talk about data locality.