bug#35531: problem with ls in coreutils

[Viktors Berstis]

My machine has 64GB of ram, 6 core 3.5ghz processor and fast disks.
The directory in question has 57,600 files in it with a total size of 
about 47gb.
On a freshly booted machine (nothing cached),  "dir /on dirname | wc" 
takes about 6 seconds.  The second time it takes about 2 seconds.
On a freshly booted machine, "ls -U -1 dirname | wc" takes 5 minutes 48 
seconds!  A second time it is about a minute less.
ls might be doing something akin to opening every file.  If I run a 
program to actually open and read every file in that directory, the 
system seems to cache it all in ram.  Then the ls takes only about 11 
seconds.

- Viktors Berstis

Kamil Dudka wrote:
> On Thursday, May 2, 2019 12:03:31 AM CEST Viktors Berstis wrote:
> > When running "ls" or "ls -U" on a windows directory containing 50000
> > files, ls takes forever.  Something seems to be highly inefficient in there.
> Could you please try it with ls -U -1?
>
> Kamil
>
> > This is for the 64 bit version build 4/20/2005 11:41AM.  The exe size is
> > 180736 bytes.
> >
> > Thanks.
> >
> > - Viktors Berstis