%T Auto\-Mobiles: Optimised Message\-Passing
%A Neil C.C. Brown
%E Peter H. Welch, Herman Roebbers, Jan F. Broenink, Frederick R. M. Barnes, Carl G. Ritson, Adam T. Sampson, G. S. Stiles, Brian Vinter
%B Communicating Process Architectures 2009
%X Some message\-passing concurrent systems, such as occam 2,
prohibit aliasing of data objects. Communicated data must
thus be copied, which can be time\-intensive for large data
packets such as video frames. We introduce automatic
mobility, a compiler optimisation that performs
communications by reference and deduces when
these communications can be performed without copying. We
discuss bounds for speed\-up and memory use, and benchmark
the automatic mobility optimisation. We show that in the
best case it can transform an operation from being linear
with respect to packet size into constant\-time.
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