bypass auto_da_alloc for metadata files #82047
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bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark #1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark #1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
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Mar 6, 2021
bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
Dylan-DPC-zz
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Mar 8, 2021
bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
Dylan-DPC-zz
pushed a commit
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that referenced
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Mar 8, 2021
bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
Dylan-DPC-zz
pushed a commit
to Dylan-DPC-zz/rust
that referenced
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Mar 8, 2021
bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
Dylan-DPC-zz
pushed a commit
to Dylan-DPC-zz/rust
that referenced
this pull request
Mar 8, 2021
bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark rust-lang#1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
This was referenced Mar 8, 2021
bors
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Mar 8, 2021
Rollup of 10 pull requests Successful merges: - rust-lang#82047 (bypass auto_da_alloc for metadata files) - rust-lang#82415 (expand: Refactor module loading) - rust-lang#82557 (Add natvis for Result, NonNull, CString, CStr, and Cow) - rust-lang#82613 (Remove Item::kind, use tagged enum. Rename variants to match) - rust-lang#82642 (Fix jemalloc usage on OSX) - rust-lang#82682 (Implement built-in attribute macro `#[cfg_eval]` + some refactoring) - rust-lang#82684 (Disable destination propagation on all mir-opt-levels) - rust-lang#82755 (Refactor confirm_builtin_call, remove partial if) - rust-lang#82857 (Edit ructc_ast_lowering docs) - rust-lang#82862 (Generalize Write impl for Vec<u8> to Vec<u8, A>) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results.
There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because
O_TRUNCis set onopen()but the writeback is triggered onclose(). The latter is the part which shows up in profiles.