https://github.com/pseitz/copy_regression_1.73

https://github.com/pseitz/copy_regression_1.73

Last synced: about 1 year ago
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• Host: GitHub
• URL: https://github.com/pseitz/copy_regression_1.73
• Owner: PSeitz
• Created: 2023-11-03T14:19:47.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2023-11-03T14:44:19.000Z (over 2 years ago)
• Last Synced: 2025-01-25T06:25:36.957Z (over 1 year ago)
• Language: Rust
• Size: 21.5 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          


# Rust 1.73 Performance Regression

Demonstrates a performance regression in Rust 1.73.0.

The program creates a Vec and reads it in chunks of 32kb. Size can be specified as a command line argument.

Check the flamegraphs for more details where time is spent.

`time cargo run --release 100000000` (If your default is 1.73)

```

Executed in    3.84 secs    fish           external

   usr time    3.80 secs  268.00 micros    3.80 secs

   sys time    0.03 secs  262.00 micros    0.03 secs

```

`time cargo run --release 200000000`

```

Executed in   16.90 secs    fish           external

   usr time   16.82 secs  626.00 micros   16.82 secs

   sys time    0.04 secs    0.00 micros    0.04 secs

```

`time cargo run --release 400000000`

```

Executed in   72.84 secs    fish           external

   usr time   72.65 secs  586.00 micros   72.65 secs

   sys time    0.06 secs  138.00 micros    0.06 secs

```

`time cargo +1.72 run --release  100000000`

```

Executed in   57.23 millis    fish           external

   usr time   16.83 millis  404.00 micros   16.43 millis

   sys time   37.02 millis    0.00 micros   37.02 millis

```

`time cargo +1.72 run --release  400000000`

```

Executed in  257.30 millis    fish           external

   usr time  150.46 millis  477.00 micros  149.98 millis

   sys time  106.64 millis  112.00 micros  106.53 millis

```