[R] openMosix vs SNOW: redhat kernel causing slowdown?
james at staarfunds.com
Fri Apr 30 00:12:53 CEST 2004
We're currently attempting to explain a slowdown of an LVQ-type parallel
analysis we're working on. We are benchmarking our analysis running
over openMosix against the same running via SNOW for R. Both perform
similarly on small datasets, but on large datasets SNOW drastically
outperforms openMosix. However, these results are achieve running SNOW
on the default RedHat kernel (Enterprise Edition, RHEL-3) and mosix on
the same kernel patched with the rpm for RedHat 9 from sourceforge.
Even though the rpm seems to be compatible and everything runs fine,
when the same SNOW analysis is run under the patched kernel there is an
enormous slowdown in runtime, to the point that openMosix outperforms SNOW.
Is there some sort of incompatibility issue with the RedHat kernels
(either general or specific to this version) that would cause a slowdown
of this kind? I know that Enterprise Edition was marketed as having
tools to increase java clustering speeds, would this interfere with the
type of socket communication SNOW uses?
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