David Mertens

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  • Aristotle commented on PDL features I'd like to see in Perl 6

    I think the new refaliasing feature (experimental in 5.22) will allow you to alias slices like so:

    \( @slice[ 0 .. 4 ] ) = \( @data[ 2, 3, 5, 7, 11 ] );

    Obviously it’s ugly to have to count out the LHS slice by hand:

    \( @slice[ 0 .. $#$_ ] ) = \( @data[ @$_ ] )
        for [2, 3, 5, 7, 11];

    That’s quite a mouthful, but at least you can package it up in a function:

    sub alias_slice {
        my ( $src, @dst ) = shift;
        \( @dst[ 0 .. $#_ ] ) = \( @$src[ @_ ] );

    \my @slice = al…

  • therflabs commented on PDL features I'd like to see in Perl 6

    Call me crazy, but I had a freelance gig converting Python numpy/scipy to Perl PDL... And barely knowing Python it was a lot easier to understand than PDL.

    I can see why numpy/scipy has gained a lot of traction.

    I'd like to see P6 PDL to be like numpy/scipy to ease crossover to Perl 6 and lower the entry level for beginners. In my opinion usability and clear documentation for the non-math scholar has hurt what PDL could have been and could be a lesson for PDL Perl 6.

  • PetaMem commented on What?! CUDA::Minimal... works?

    And here's this - with Perl 5.22, GCC 5.3.0, CUDA 7.5 anno domini 2016:
    # ./Build test
    t/00_load.t ............... ok   
    t/Index-Manipulation.t .... ok   
    t/Memory.t ................ ok   
    t/Transfer.t .............. ok     
    t/z_PDL.t ................. ok     
    t/z_kernel_invocations.t .. ok    
    All tests successful.
    Files=6, Tests=76,  1 wallclock secs ( 0.02 usr  0.01 sys +  0.21 cusr  0.74 csys =  0.98 CPU)
    Result: PASS

    You have to do some hacking

    to remain silent about gcc …

  • Yuki Kimoto commented on SPVM is released! Perl maybe become much fast.

    SPVM is not C compiler.

    SPVM is compiler and runtime of SPVM bytecode.

    SPVM don't need any C compiler to run SPVM module.

    SPVM module load is fast and easy.

    If I need more performance, I maybe use libjit to compile bytecodes to machine code.

  • Yuki Kimoto commented on SPVM is released! Perl maybe become much fast.

    > you're making it very easy to call from Perl.

    I'm happy you have found the advantage of bytecode.
    Easy to use is one of the big goals.

    >Have you toyed around with any benchmarks compared with pure Perl? Could I try writing some C::Blocks versions to compare?

    I don't do any benchmark yet because SPVM specification has yet something bugs. I must fix it.

    I'm happy if you do benchmark in current status of SPVM. Maybe array loop is very fast than Perl because
    arrays are present in consecutive memory areas.

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