Re: [OMPI users] Error message when using MPI_Type_struct()

Hi Thomas, The message you get comes from the convertor. The convertor is in charge of packing/unpacking the data. As you add yourself an extra int to the wire data, the convertor gets confused on the receiver side, as it gets a message that's not in the expected format. What you should

Re: [OMPI users] RCE Interview of OpenMPI

Brock -- I'd love to do it. Let me ping George and see who else may be interested; we'll coordinate specific times and whatnot off-list. On Jan 8, 2009, at 9:05 PM, Brock Palen wrote: Hi List, I am starting up a PodCast on my own time on HPC/Research Computing. One of the requested top

Re: [OMPI users] RCE Interview of OpenMPI

Thanks, Let me know when you are ready. Brock Palen www.umich.edu/~brockp Center for Advanced Computing bro...@umich.edu (734)936-1985 On Jan 9, 2009, at 2:02 PM, Jeff Squyres wrote: Brock -- I'd love to do it. Let me ping George and see who else may be interested; we'll coordinate speci

[OMPI users] slow MPI_BCast for messages size from 24K bytes to 800K bytes.

Hello there, We have a DDR IB cluster with Open MPI ver 1.2.8. I'm testing on two nodes with two processors each and both the nodes are adjacent (2 hops distant) on the same leaf of the tree interconnect. I observe that when I try to MPI_BCAST among the four MPI tasks it takes a lot of time wit