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Re^4: pipe fork win32

by bulk88 (Priest)
on Aug 26, 2012 at 13:59 UTC ( #989825=note: print w/ replies, xml ) Need Help??


in reply to Re^3: pipe fork win32
in thread pipe fork win32

Self built Visual C DEBUGGING Perl. I tried 373 repeat count on ActivePerl 5.10 and it worked successfully. I dont know if DEBUGGING is to blame, or it is ActiveState's own tweak to Perl. You can try looking through AS's diff file http://downloads.activestate.com/ActivePerl/releases/5.16.0.1600/ActivePerl-5.16.0.1600-295879-diff.txt if you are curious. It might also be a header difference between my MS C Compiler and AS's MS C Compiler.


Comment on Re^4: pipe fork win32
Re^5: pipe fork win32
by BrowserUk (Pope) on Aug 26, 2012 at 14:17 UTC

    It's 4k on perl5.8.9, perl10.1, and 8k on perl5.14.2.

    Looks like p5p decided to change it in PerlIO for some stupid reason.


    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

    RIP Neil Armstrong

        Configurable, at runtime, would be fantastic. Applying an arbitrary increase to all buffered IO is very questionable.


        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.

        RIP Neil Armstrong

        /div
Re^5: pipe fork win32
by BrowserUk (Pope) on Aug 26, 2012 at 15:20 UTC

    See http://www.nntp.perl.org/group/perl.perl5.porters/2011/02/msg169265.html for the change which apparently came in for 5.14.

    As the author notes 8k is an arbitrary figure. (And arbitrary is always stupid.)

    On every system I've checked -- including various flavours of Windows, one Linux and 1 BSD -- the optimal buffer size for disk IO is 16k or 64k.

    But for pipes and sockets, 4k is already too big for many purposes.

    I guess the best solution would be to expose setvbuf().


    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

    RIP Neil Armstrong

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