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Re: [computer-go] Hardware-Instruction.
-----Ursprüngliche Nachricht-----
Von: Don Dailey <drd@xxxxxxxxxxxxxxxxx>
An: computer-go@xxxxxxxxxxxxxxxxx <computer-go@xxxxxxxxxxxxxxxxx>
Cc: computer-go@xxxxxxxxxxxxxxxxx <computer-go@xxxxxxxxxxxxxxxxx>
Datum: Samstag, 6. November 2004 18:54
Betreff: Re: [computer-go] Hardware-Instruction.
>
>> According my feeling is Cilk more high level than e.g. MPI. It is easier
>> converting an existing programm to a parallel version with Cilk than with
>> MPI. I assume (but have never done any concrete tests or studies) that
this
>> high-level comes with a price. MPI is probably faster and more flexible.
>
>Cilk is really C, so it's not a high level language. Probably you are
>right about the flexibility issue, Cilk does the scheduling itself.
This was my meaning of "high-level". In MPI the application (programmer) is
responsible for scheduling.
>At the last world championship we played in, David Levy predicted that
>we would not win even though we were one of the favorites. His
>prediction and reasoning was based on the fact that parallel programs
>are typically full of bugs and problems.
At the Leiden 2004 tournament one of the running gags was that Diep has on
the massive-parallel system too many Kilo-Bugs per second.
When Fritz run in preperation for the Kramnik match the first time on an
8-processor server it killed within a few milliseconds the OS.
When Hydra (Brutus) was ported from a Dual to an 8-processor Cluster, it
landed within 100 millisecond in a Deadlock.
We could fix the problems within 1 week. Since then I have not touched the
parallel code because it works fine. We had also no problem when going from
8 to 16 processors. But for Parallel-Researchers is 16-processors not really
parallel. Starts somewhere at 256-Processors.
Question: Is Cilk available on Clusters?
Chrilly
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