From: Eric Wong <normalperson@...>
Date: 2017-07-24T21:40:24+00:00
Subject: [ruby-core:82155] Re: [Ruby trunk Bug#13167] Dir.glob is 25x slower since Ruby 2.2

Eric Wong <normalperson@yhbt.net> wrote:
> $ strace -c -e getdents ruby --disable=gems -e 'Dir.glob("*/*.{flac}")'
> => 935 getdents calls
> 
> $ strace -c -e getdents ruby --disable=gems -e 'Dir.glob("*/*.{flac,ogg}")'
> => 1870 getdents calls
> 
> $ strace -c -e getdents ruby --disable=gems -e 'Dir.glob("*/*.{flac,ogg,mp3}")'
> => 2805 getdents calls

ksh93, zsh, bash all exhibit the same behavior, even.
And it appears a major refactoring of dir.c is necessary to
support optimizing away redundant readdir (getdents on Linux) calls.

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