Loopback communication it's shared memory copy, of course.
Even if it would be implemented with socket() and other network
syscalls, kernel will do finally only memory copying.
Il giorno 01/mar/08, alle ore 00:25, Elvedin Trnjanin ha scritto:
I'm using a "ping pong" program to approximate bandwidth and latency
of
various messages sizes and I notice when doing various transfers (eg.
async) that the maximum bandwidth isn't the system's maximum
bandwidth.
I've looked through the FAQ and I haven't noticed this being covered
but
how does OpenMPI handle loopback communication? Is it still over a
network interconnect or some sort of shared memory copy?
- Elvedin
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