On 2009 Mar 3, at 12:31, mwin...@brocku.ca wrote:
In both runs the same computations are done (sequentially resp.
parallel), so the gc should be the same. But still using 2 cores is
much slower than using 1 core (same program - no communication).

The same GCs are done, but GC has to be done on a single core (currently; parallel GC is in development) so you will see a lot more lock contention when the GC kicks in.

--
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com
system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH


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