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README

XMP-64 performance experiments
==============================

This is the source code for a set of performance experiments for the XMOS XMP-64
board, a general-purpose 64-core parallel computer.  They obtained detailed
measurements for barrier synchronisations and static and random traffic
permutation patterns.  Publised documentation of the results can be found on the
XMOS website: http://www.xmos.com/published/xmp-64-performance-measurements.

Compilation requires the *patched* XMOS 9.9.2 tools or greater. 

For more information on the XMP-64 board visit
https://www.xmos.com/products/development-kits/xmp-64.

The project contains three main programs:
 - A 'ping' programs which measures message latency between pairs of nodes
 - A 'barrier' program which measures the time taken for all nodes to complete a
   barrier synchronisation.
 - A 'traffic' program which measures message latency under different traffic
   permutations

Perhaps most useful is the 'common' directory which includes more general code,
including:
 - Timing functions written in assembly used in...
 - Global clock synchronisation over the hypercube.
 - General hypercube functions such as minimum and maximum.
 - A simple pipe communication structure.

Compilation and running
-----------------------

cd ping
make
xrun --io ping.xe

cd barrier
make
xrun --io barrier.xe

cd traffic
make traffic
make wrapper
java wrapper.Main

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Performance experiments with the XMOS XMP-64

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