Hi all,
There's a port archivers/pbzip2, and I am inclined to believe this is a
good benchmark for multi-core performance in real-world usage (with an
appropriate input data set).
BZIP2 is a compression algorithm which is readily applicable to
multicore, because of the nature in which its workload may be partioned
amongst multiple CPU cores. It block-sorts, and it can compress long
runs of input data independently of other CPU threads.
When I used PBZIP2 informally back in January, before advising on
FreeBSD/Xen, I saw largely the results I'd expect to see from such a
workload, and didn't encounter pessimization of benchmark figures.
Informal tests were performed on 8-STABLE at that time.
The OP may well be looking for Newton-Raphson approximations, to the
derivatives involved in his friend's linear algebra system. The point is
that PBZIP2 would also exercise context switches in a real-life workload.
I'd be concerned, as anyone else would be, about benchmarks which
apparently challenge FreeBSD's ability to tackle significant
mathematical workloads. But from what little I understand, from speaking
to David Schultz and others who have been involved with FreeBSD's
floating point performance, on a scientific basis -- without a
scientifically reproducible experiment, I don't see a problem.
Obviously, I am concerned that Nakata-san observes what he regards to be
a problem, and would like to help any way I can.
cheers,
BMS
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