rfe: CYGWIN fslinktypes option? Re: Catastrophic Cygwin find . -ls, grep performance on samba share compared to WSL&Linux

[Andrey Repin]

Greetings, Martin Wege!

> The root cause is IMO the extra Win32 syscalls (>= 3 per file lookup,
> compared to 1 on Linux) to lookup the *.lnk and *.exe.lnk files on
> filesystems which have native link support (NTFS, ReFS, SMBFS, NFS).

Except you require elevation to actually create symlinks.
Or some special system configuration.

> On SMBFS and NFS it hurts the most, because access latency is the
> highest for networked filesystems.

> So my proposal would be to add an option ('fslinktypes') to the CYGWIN
> environment variable to define which types of links are supported:
> default 'all'. which is an shortcut for 'native,lnk,lnkexe'.
> So in case people do not want 'lnk' link support they just add
> CYGWIN+=' fslinktypes:native' to env, to turn off support for
> lnk/lnk.exe style links, and be happy.

> @Corinna Vinschen Would that be acceptable?

Make a patch to begin discussion.
Also, not all mangling is meaningful to disable. F.e. disabling .exe magic on
Windows would be surprising to the end user.


-- 
With best regards,
Andrey Repin
Friday, December 22, 2023 21:50:58

Sorry for my terrible english...