Re^7: Working with fixed length files

Note that if you keep local $/ = \122; in ike1, it has a *huge* influence on performance,

That's may be because as you haven't used binmode, IO layers are still in force and are checking for the default input delimiter (newlines) even though they are not being used. By setting $/ = \nnn, it stops the input buffer being scanned as it is loaded. (Or something like that. :)

I'd expect to see similar changes with $/ = \nnn in the other routines to.

I really like your idea of binding unpack templates to an array of aliases to partitions of a buffer. Effectively 'compiling' the template much as /o (used) to compile regexes.

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Comment on Re^7: Working with fixed length files

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Re^8: Working with fixed length files by Tux (Canon) on Apr 28, 2011 at 11:52 UTC
In a dedicated benchmark to test this, binmode doesn't change anything at all: `with a binmode call: Rate with_rs without with_rs 254857/s -- -34% without 384458/s 51% -- without a binmode call: Rate with_rs without with_rs 260564/s -- -31% without 375127/s 44% --` [download] I've just posted the question to the perl5 porters. Enjoy, Have FUN! H.Merijn	[reply] [d/l]