in reply to Re: perl io and linux issues
in thread perl io and linux issues

I think the issue in question is that even running over a file, finding newlines, and forming lines, in the same way that readline should do, works faster in linux as a read of a block of data and subsequent line formation than as a readline.
An initial answer to this has already been made by tye in the note here.

I believe the question is asking more why Perl IO is broken on Linux, and what can be done to work around this in the meantime.
Cheers,

Malk

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Re: perl io and linux issues
by dino (Sexton) on Apr 04, 2001 at 20:42 UTC
    After a little digging it appears not to be a problem with linux per se but glibc 2. (Please correct me if I'm wrong) Fast stdio io in perl uses the hooks _ptr and _cnt specified in the normal stdio.h. Unfortunately _cnt is not visible in the glibc 2 version. I've seen mentions of a glue.c file in glibc source that may allow a work around.

    If this is a glibc 2 then there may be future problems on other platforms, or do other platforms that use glibc 2 and have fast perl io, have a modified stdio.h?

    Perhaps sfio allows such direct hooks, has anybody else made progress on this issue?

    regards dino

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