Raspberry Pi OS 64-bit 與 32-bit 的效能差異
source link: https://blog.gslin.org/archives/2022/02/08/10531/raspberry-pi-os-64-bit-%e8%88%87-32-bit-%e7%9a%84%e6%95%88%e8%83%bd%e5%b7%ae%e7%95%b0/
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Raspberry Pi OS 64-bit 與 32-bit 的效能差異
前幾天提過「Raspberry Pi OS 64-bit 版本正式推出」，而 Phoronix 實際拿正式版測試 64-bit 與 32-bit 的系統差異了，在「Raspberry Pi OS 32-bit vs. 64-bit Performance」這邊可以看到每一個測試項目的結果。
測試的硬體是 Raspberry Pi 400，這台機器基本上就是 4GB 版本的 Raspberry Pi 4 加上週邊配件：
Using a Raspberry Pi 400 keyboard computer with 4GB of RAM, I ran some fresh benchmarks of Raspberry Pi OS in its default 32-bit build and then again with the new 64-bit build.
先講結果，在 Phoronix 的 33 個測試裡面，64-bit 全部都比 32-bit 好，而且是很明顯的差異：
Across the few dozen different workloads tested, switching Raspberry Pi OS 11 for the 64-bit version improved the performance on average by about 48%. See all the 32-bit vs. 64-bit Raspberry Pi benchmarks over on OpenBenchmarking.org.
之前 64-bit OS 還在 beta 的時候就已經知道這個情況了，所以不會覺得太意外。當時提出的解釋是指令集的差異，aarch64 提供的指令集比 armv6 有效率多了，這點在 2016 年的文章「64-bit ARM (Aarch64) Instructions Boost Performance by 15 to 30% Compared to 32-bit ARM (Aarch32) Instructions」這邊可以看到說明。
所以正式版出來以後，只要硬體有支援，基本上都建議裝 64-bit OS 了...
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