From your other comment you're using ext4, so I'd expect the file system to support sub-second timestamps, if you do:

# this is a command-line command, not perl code
stat .

[download]

does it show sub-second timestamps, eg. I get

$ stat .
  File: .
  Size: 20480           Blocks: 40         IO Block: 4096   directory
Device: 253,2   Inode: 33079540    Links: 26
Access: (0755/drwxr-xr-x)  Uid: ( 1000/    tony)   Gid: ( 1000/    ton
+y)
Access: 2025-03-10 07:39:22.352732987 +1100
Modify: 2025-03-06 15:07:42.145467132 +1100
Change: 2025-03-06 15:07:42.145467132 +1100
 Birth: 2022-08-08 15:04:51.515950529 +1000

[download]

In reply to Re^3: Perl release v5.40.1 on a 32-bit box showing failed tests for atime and ctime in Time::HiRes by tonyc
in thread Perl release v5.40.1 on a 32-bit box showing failed tests for atime and ctime in Time::HiRes by Intrepid

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