std.parallelism: Request for Review

[Russel Winder]

On Sat, 2011-02-26 at 16:13 -0500, dsimcha wrote:
[ . . . ]
> One last note:  Due to Bug 5612 
> (http://d.puremagic.com/issues/show_bug.cgi?id=5612), the benchmarks 
> don't work on 64-bit because core.cpuid won't realize that your CPU is 
> multicore.  There are two ways around this.  One is to use 32-bit mode. 
>   The other is to change the benchmark files to manually set the number 
> of cores by setting the defaultPoolThreads property.

Actually this bug is worse that at first appears:  32-bit is badly
broken in that the core count of one processors is reported, it ignores
having multiple processors.  So on my twin-Xeon in 64-bit core.cpuid
report 1 and in 32-bit mode it reports 4 instead of 8.
Aaarrrgggghhhhhh....

NB The source code link on
http://digitalmars.com/d/2.0/phobos/core_cpuid.html  points to
https://github.com/D-Programming-Language/phobos/blob/master/core/cpuid.d which is a 404.

I guess I'll have to clone Phobos in its entirety in order to take a
look at this.  Damn I only want to look at the one file.

In 64-bit mode:

        |> scons runall
        /usr/bin/python /home/Checkouts/Mercurial/SCons/bootstrap/src/script/scons.py runall
        scons: Reading SConscript files ...
        scons: done reading SConscript files.
        scons: Building targets ...
        dmd -I. -I/home/users/russel/lib/D -m64 -release -O -inline -c -ofeuclidean.o euclidean.d
        gcc -o euclidean -m64 euclidean.o -L/home/users/russel/lib.Linux.x86_64 -L/home/users/russel/lib.Linux.x86_64/DMD2/lib64 -lparallelism -lphobos2 -lpthread -lm -lrt
        dmd -I. -I/home/users/russel/lib/D -m64 -release -O -inline -c -ofmatrixInversion.o matrixInversion.d
        gcc -o matrixInversion -m64 matrixInversion.o -L/home/users/russel/lib.Linux.x86_64 -L/home/users/russel/lib.Linux.x86_64/DMD2/lib64 -lparallelism -lphobos2 -lpthread -lm -lrt
        dmd -I. -I/home/users/russel/lib/D -m64 -release -O -inline -c -ofmillionSqrt.o millionSqrt.d
        gcc -o millionSqrt -m64 millionSqrt.o -L/home/users/russel/lib.Linux.x86_64 -L/home/users/russel/lib.Linux.x86_64/DMD2/lib64 -lparallelism -lphobos2 -lpthread -lm -lrt
        dmd -I. -I/home/users/russel/lib/D -m64 -release -O -inline -c -ofparallelSort.o parallelSort.d
        gcc -o parallelSort -m64 parallelSort.o -L/home/users/russel/lib.Linux.x86_64 -L/home/users/russel/lib.Linux.x86_64/DMD2/lib64 -lparallelism -lphobos2 -lpthread -lm -lrt
        dmd -I. -I/home/users/russel/lib/D -m64 -release -O -inline -c -ofpipelining.o pipelining.d
        gcc -o pipelining -m64 pipelining.o -L/home/users/russel/lib.Linux.x86_64 -L/home/users/russel/lib.Linux.x86_64/DMD2/lib64 -lparallelism -lphobos2 -lpthread -lm -lrt
        runEverything(["runall"], ["euclidean", "matrixInversion", "millionSqrt", "parallelSort", "pipelining"])
        
        ========  euclidean  ============
        Serial reduce:  1158 milliseconds.
        Parallel reduce with 1 cores:  1159 milliseconds.
        
        ========  matrixInversion  ============
        Inverted a 256 x 256 matrix serially in 62 milliseconds.
        Inverted a 256 x 256 matrix using 1 cores in 60 milliseconds.
        
        ========  millionSqrt  ============
        Parallel benchmarks being done with 1 cores.
        Did serial millionSqrt in 956 milliseconds.
        Did parallel foreach millionSqrt in 990 milliseconds.
        Did parallel map millionSqrt in 985 milliseconds.
        
        ========  parallelSort  ============
        Serial quick sort:  4542 milliseconds.
        Parallel quick sort:  4616 milliseconds.
        
        ========  pipelining  ============
        Did serial string -> float, euclid in 2097 milliseconds.
        Did parallel string -> float, euclid with 1 cores in 1939 milliseconds.
        
        scons: done building targets.

In 32-bit mode:

        <pending, I need to fix the SCons D mode to get this to work :-(>

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at russel.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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