[mpich-discuss] High school project on distributed computing

[Alexandre Vieira]

Hello list,

I'm currently writing a paper on distributed computing and also elaborate a
simple use case to include as a proof of concept.

My setup:

- 3 VMs running on different machines (same HW) with 1 CPU and 2GB RAM
running FreeBSD 10.3
- Connected through a 1Gbps LAN and communicate passwordless through SSH.
- MPICH 3.2_1 installed and working on the three nodes

I've tried to compile and run some code samples that are available for
mpich (i.e: http://people.sc.fsu.edu/~jburkardt/c_src/mpi/search_mpi.c)
 but I always end up getting worst times running on the 3 nodes that I get
running on 1 node alone, even when I can get all 3 nodes to get up to a
100% CPU usage for a couple of minutes.

I know there is network overhead and SSH isn't helping either, so without
investing too much time I unfortunately won't have, I'd like to ask you
what kind of simple program could I write just for the sake of a proof of
concept that running a program with 3 nodes would be faster than running on
one.

Maybe dealing with slower operations like disk I/O do counter the
inter-node communication?

Many thanks for your kind help

BR
Alex
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