All the shared memory code is in the "sm" BTL (byte transfer layer) component:
ompi/mca/btl/sm. All the TCP MPI code is in the "tcp" BTL component:
ompi/mca/btl/tcp. Think of "ob1" as the MPI engine that is the bottom of
MPI_SEND, MPI_RECV, and friends. It takes a message to be sent, determin
Thanks a lot Jeff.
PIN is a dynamic binary instrumentation tool from Intel. It runs on top of
the Binary in the MPI node. When its given function calls to instrument, it
will insert trappings before/after that funtion call in the binary of the
program you are instrumenting and you can insert your
On Nov 22, 2011, at 1:09 AM, Shamik Ganguly wrote:
> I want to trace when the MPI library prevents an MPI_Send from going to the
> socket and makes it access shared memory because the target node is on the
> same chip (CMP). I want to use PIN to trace this. Can you please give me some
> pointe
Hi,
I want to trace when the MPI library prevents an MPI_Send from going to
the socket and makes it access shared memory because the target node is on
the same chip (CMP). I want to use PIN to trace this. Can you please give
me some pointers about which functions are taking this decision so that
