* [ruby-core:91656] [Ruby trunk Bug#15633] Pathological slowdown in File.expand_path on UNC paths on Windows
[not found] <redmine.issue-15633.20190303123031@ruby-lang.org>
@ 2019-03-03 12:30 ` djberg96
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From: djberg96 @ 2019-03-03 12:30 UTC (permalink / raw)
To: ruby-core
Issue #15633 has been reported by djberg96 (Daniel Berger).
----------------------------------------
Bug #15633: Pathological slowdown in File.expand_path on UNC paths on Windows
https://bugs.ruby-lang.org/issues/15633
* Author: djberg96 (Daniel Berger)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x64-mingw32]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
For a while now, including Ruby 2.5, calling File.expand_path on an absolute UNC path seems to be strangely slow. I've put together some benchmarks here:
```
require 'benchmark'
MAX = 200000
Benchmark.bm(30) do |x|
x.report("expand_path('foo/bar')") do
str = "foo/bar"
MAX.times{ File.expand_path(str) }
end
x.report("expand_path('C:/foo/bar')") do
str = "C:/foo/bar"
MAX.times{ File.expand_path(str) }
end
x.report("expand_path('//foo/bar')") do
str = "//foo/bar"
MAX.times{ File.expand_path(str) }
end
x.report("expand_path('foo//bar///')") do
str = "foo//bar///"
MAX.times{ File.expand_path(str) }
end
x.report("expand_path('~')") do
str = "~"
MAX.times{ File.expand_path(str) }
end
x.report("expand_path('')") do
str = ""
MAX.times{ File.expand_path(str) }
end
x.report("expand_path('', '~')") do
MAX.times{ File.expand_path('', '~') }
end
end
```
What I see is that most of these take only a second or two, while the UNC path takes 30+ seconds.
--
https://bugs.ruby-lang.org/
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2019-03-03 12:30 ` [ruby-core:91656] [Ruby trunk Bug#15633] Pathological slowdown in File.expand_path on UNC paths on Windows djberg96
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