Dear List,
A more detailed analysis of program speed in single core Vs
multicore architectures :
Same Java program on a single CPU machine can actually run a lot
faster than on a multiprocess/multi-core machine!!
http://mlee888.wordpress.com/2006/03/31/java-performance-in-dual-
coremultiprocessor-environment/
FWIW, Fellow smalltalker Paul Baumann wrote:
We recently had an trader user make this comment:
Finally, I'm still seeing a 10x slowdown with multi-processors (I
have an Intel Core 2 Duo). To fix the problem, I change the process
affinity to a single processor and it speeds up by 10x. Someone,
either at Sun or ICE has got to know how to fix this Java runtime
problem. I even tested the new Java build 1.5.0_10-b03 but the issue
still exists. It would be nice to have each trader lock on and run
on a single processor to nearly double (or later quadruple) performance.
This same sort of problem likewise affects the smalltalk (..and I
presume Ruby also) community and is generating a lot of discussions
on how to exploit the spare cores.
HTH
Kuang
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