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| author | Markus Westerlind <markus.westerlind@distilnetworks.com> | 2020-02-17 08:09:34 +0100 |
|---|---|---|
| committer | Markus Westerlind <markus.westerlind@distilnetworks.com> | 2020-02-17 15:35:42 +0100 |
| commit | 7ac4154643a952fed1d942adcb78e27b17ad41dd (patch) | |
| tree | d4dd87bd5bed8ebfe0666a94bfa71a2464a7d4f6 | |
| parent | 75b98fbe77d472d85d1691bae5b25e7eefb3609c (diff) | |
| download | rust-7ac4154643a952fed1d942adcb78e27b17ad41dd.tar.gz rust-7ac4154643a952fed1d942adcb78e27b17ad41dd.zip | |
perf: Buffer stderr when writing json errors/warnings
Since `stderr` is unbuffered, writing out json messages actually take up about ~10%/0.1s of the runtime of the `inflate` benchmark. cc #64413
| -rw-r--r-- | src/librustc_errors/json.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_errors/json.rs b/src/librustc_errors/json.rs index ffdff6acec5..f0cfd815a2c 100644 --- a/src/librustc_errors/json.rs +++ b/src/librustc_errors/json.rs @@ -48,7 +48,7 @@ impl JsonEmitter { macro_backtrace: bool, ) -> JsonEmitter { JsonEmitter { - dst: Box::new(io::stderr()), + dst: Box::new(io::BufWriter::new(io::stderr())), registry, sm: source_map, pretty, |