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1951857ec0
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qmuntal 1951857ec0 os: use handle based APIs to read directories on windows 
This CL updates File.readdir() on windows so it uses
GetFileInformationByHandleEx with FILE_ID_BOTH_DIR_INFO
instead of Find* APIs. The former is more performant because
it allows us to buffer IO calls and reduces the number of system calls,
passing from 1 per file to 1 every ~100 files
(depending on the size of the file name and the size of the buffer).

This change improve performance of File.ReadDir by 20-30%.

name        old time/op    new time/op    delta
ReadDir-12     562µs ±14%     385µs ± 9%  -31.60%  (p=0.000 n=9+9)

name        old alloc/op   new alloc/op   delta
ReadDir-12    29.7kB ± 0%    29.5kB ± 0%   -0.88%  (p=0.000 n=8+10)

name        old allocs/op  new allocs/op  delta
ReadDir-12       399 ± 0%       397 ± 0%   -0.50%  (p=0.000 n=10+10)

This change also speeds up calls to os.SameFile when using FileStats
returned from File.readdir(), as their file ID can be inferred while
reading the directory.

Change-Id: Id56a338ee66c39656b564105cac131099218fb5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/452995
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
2023-01-24 13:26:00 +00:00
.github .github: suggest using private browsing in pkgsite template 2023-01-03 18:52:47 +00:00
api context: add APIs for setting a cancelation cause when deadline or timer expires 2023-01-20 21:41:01 +00:00
doc runtime: replace panic(nil) with panic(new(runtime.PanicNilError)) 2023-01-19 22:21:50 +00:00
lib/time time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
misc all: fix typos in go file comments 2023-01-20 03:27:26 +00:00
src os: use handle based APIs to read directories on windows 2023-01-24 13:26:00 +00:00
test cmd/compile: teach prove about unsigned division, modulus and rsh 2023-01-23 18:35:41 +00:00
.gitattributes
.gitignore time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
codereview.cfg
CONTRIBUTING.md
go.env cmd/go: introduce GOROOT/go.env and move proxy/sumdb config there 2023-01-17 23:10:39 +00:00
LICENSE
PATENTS
README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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