I’ve previously written a bunch about the effects of location, Location, LOCATION! on MPI applications. Here’s another subtle NUMA effect that a well-tuned MPI implementation can hide from you: intelligently distributing traffic between
If you’re a bargain basement HPC user, you might well scoff at the idea of having more than one network interface for your MPI traffic. “I’ve got (insert your favorite high bandwidth network name here)! That’s plenty to serve
I have previously written a few details about our upcoming ultra low latency solution for High Performance Computing (HPC). Since my last blog post, a few of you sent me emails asking for more technical details about it. So let’s just put it
Open MPI recently revamped its entire run-time parameter system (a.k.a., “MCA parameter system”) as part of its implementation effort for the “MPI_T” interface from MPI-3. The MPI_T interface is a standardized interface
I’ve previously posted on “Why MPI is Good for You” (blog tag: why-mpi-is-good-for-you). The short version is that it hides the typical application programmer from lots and lots of underlying network stuff; stuff that they really
Today’s guest posting comes from Jesper Larsson Träff; he’s Faculty of Informatics, Institute of Information Systems in the Research Group for Parallel Computing at the Vienna University of Technology (TU Wien). Have you ever wondered why
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
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
I’ve been a bit remiss about posting recently; it’s conference-paper-writing season, folks — sorry. But I thought I’d mention that I’ll be speaking at the Midwest Open Source Software Convention (MOSSCon) this weekend.
