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Use File::metadata instead of fs::metadata to choose buffer size - #47520

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mbrubeck:fstat
Jan 18, 2018
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Use File::metadata instead of fs::metadata to choose buffer size#47520
bors merged 1 commit into
rust-lang:masterfrom
mbrubeck:fstat

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@mbrubeck

@mbrubeckmbrubeck commented Jan 17, 2018

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This replaces a stat syscall with fstat or similar, which can be faster. Fixes#47519.

@mbrubeck
Use File::metadata instead of fs::metadata to choose buffer size
e9fdee8
This replaces a `stat` syscall with `fstat` or similar, which can be
faster. Fixesrust-lang#47519.
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rust-highfive commented Jan 17, 2018

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r? @shepmaster

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@Mark-Simulacrum

Mark-Simulacrum commented Jan 17, 2018

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@bors r+ rollup

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bors commented Jan 17, 2018

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📌 Commit e9fdee8 has been approved by Mark-Simulacrum

@Mark-SimulacrumMark-Simulacrum added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jan 17, 2018
@mbrubeck

mbrubeck commented Jan 17, 2018

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I confirmed this speeds up these functions by a small constant amount on my Linux system. Example speedup:

test read_32kb_alloc ... bench: 3,159 ns/iter (+/- 693)
test read_32kb_alloc2 ... bench: 2,875 ns/iter (+/- 395)

GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Jan 17, 2018
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Rollup merge ofrust-lang#47520- mbrubeck:fstat, r=Mark-Simulacrum
2606537
Use File::metadata instead of fs::metadata to choose buffer size
This replaces a `stat` syscall with `fstat` or similar, which can be faster. Fixesrust-lang#47519.
@GuillaumeGomezGuillaumeGomez mentioned this pull request Jan 17, 2018
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bors added a commit that referenced this pull request Jan 18, 2018
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Auto merge of#47528- GuillaumeGomez:rollup, r=GuillaumeGomez
3bd4af8
Rollup of 6 pull requests
- Successful merges: #47250, #47313, #47398, #47468, #47471, #47520
- Failed merges:
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bors merged commit e9fdee8 into rust-lang:masterJan 18, 2018
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