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Parallel diff and cmp on binary files?

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評估

難度
5/5
預估耗時
一週以上
新手友好度
25/100
Issue 類型
功能
描述清晰度
需要釐清
活躍度
停滯
技術堆疊
rust
領域
cli, performance

研究方向

未指定原始碼檔案、測試或特定進入點。先找出 diff 和 cmp 的二進位比較路徑,並將其目前的行為與回報的 b3sum 計時結果進行比較測量。在實作之前,定義平行處理適用於二進位檔案、目錄比較,還是兩者皆適用,並確定哪些基準測試和測試能夠證明這項變更已完成。

由索引模型根據 Issue 內容生成。

描述

I just had a revelation:

$ time b3sum dreamshaper_8\ \(1\).safetensors dreamshaper_8.safetensors
771c807db56dbfc33feda5638d920f6c507db971da44772ee44a08dc38c3b437  dreamshaper_8 (1).safetensors
771c807db56dbfc33feda5638d920f6c507db971da44772ee44a08dc38c3b437  dreamshaper_8.safetensors

real    0m0.172s
user    0m2.193s
sys     0m0.423s


$ time cmp dreamshaper_8\ \(1\).safetensors dreamshaper_8.safetensors

real    0m0.596s
user    0m0.183s
sys     0m0.411s

$ time diff dreamshaper_8\ \(1\).safetensors dreamshaper_8.safetensors

real    0m0.509s
user    0m0.079s
sys     0m0.428s

As you can see, even though the b3sum method has an additional cost (calculating a hash) it is way faster overall since it's leveraging parallelism.

Wouldn't it be a good improvement to bring parallelism to some of the tools like diff and cmp?
Maybe with a new (not-standardized) option?
Maybe by default because why not?

I guess diff has a special code path once it is sure that it's just a binary file, right? So in that code path it wouldn't be much of a problem to parallelize it.

This whole topic can even be pushed further when comparing directories... parallel diffing of files.

Come on it's 2025! :)

主要語言
Rust
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