std.parallelism: Request for Review

[Russel Winder]

David,

On Sun, 2011-02-27 at 09:48 -0500, dsimcha wrote:
[ . . . ]
> Can you please re-run the benchmark to make sure that this isn't just a 
> one-time anomaly?  I can't seem to make the parallel matrix inversion 
> run slower than serial on my hardware, even with ridiculous tuning 
> parameters that I was almost sure would bottleneck the thing on the task 
> queue.  Also, all the other benchmarks actually look pretty good.

Sadly the result is consistent :-(

        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 60 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 76 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 58 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 84 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 61 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 65 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 58 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 76 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 59 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 84 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 58 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 84 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> matrixInversion
        Inverted a 256 x 256 matrix serially in 58 milliseconds.
        Inverted a 256 x 256 matrix using 4 cores in 84 milliseconds.
        506 anglides:/home/Checkouts/Git/Git/D_StdParallelism/benchmarks
        |> 



-- 
Russel.
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