MacOS much slower than Linux

[dundee]

From daily usage of MacOS it seemed to me that Gdu is much slower there than on Linux.
Today I finally tried to collect CPU profiles supporting that.

• linux
• linux-cold
• macos

I ran the analysis on the same folder on both and the results are really quite different.
Linux needed only 1.3s o CPU time to scan 1.7GB and 100k files.
When the file-system caches were flushed, it still needed only 3 seconds.
On the other hand MacOS needed almost 7 seconds of CPU time (no caches flushed).

The Linux machine has KINGSTON OM8PCP3512F-AB SSD which should be almost twice slower than the Apple AP0512 SSD.
Both disks are encrypted (LUKS over LVM on Linux).
Also the Linux machine runs on already quite old AMD Ryzen 4700U (16 GB RAM).
The Apple is M2 Pro (32 GB RAM) from 2023.

From the CPU profile it seems that the slowness all goes to less performant syscall on MacOS.

Does anybody has an idea why is that? Could it be APFS so much slower than Ext4?

[dundee]

I also tried another disk usage analyzer (written in Rust) and the results are similar:

Linux:

Executed in   86.35 millis    fish           external
   usr time  158.58 millis  603.00 micros  157.98 millis
   sys time  436.02 millis    0.00 micros  436.02 millis

Linux with dropped caches:

Executed in  904.29 millis    fish           external
   usr time    0.60 secs    517.00 micros    0.60 secs
   sys time    2.01 secs    129.00 micros    2.01 secs

MacOS:

0.14s user 5.98s system 878% cpu 0.697 total