In my particular case, we're seeing this behavior: 7-mode: (//devnas04/largedisk/bsmith/netapp)
:$ //devnas04/largedisk/bsmith/netapp>time ls -ld struct5* -rw-r--r-- 1 bsmith Domain Users 0 Nov 5 10:25 struct51.log [snipped] -rw-r--r-- 1 bsmith Domain Users 0 Nov 5 10:26 struct5z.prf real 0m1.308s user 0m0.031s sys 0m0.125s cdot-mode: (//rdlserv/testdata/rdl117_nt/test) :$ //rdlserv/testdata/rdl117_nt/test>time ls -ld struct5* -rwxrwx---+ 1 Unknown+User Unknown+Group 23047 Nov 4 21:47 struct51.log [snipped] -rwxr-x---+ 1 Unknown+User Unknown+Group 595 Oct 31 23:53 struct5z.prf real 1m7.698s user 0m0.249s sys 0m11.484s The difference is 1.3 seconds versus 1 minute 7 seconds. The directory is identical on the two NetApps and they both contain ~29K files. C-dot (Cluster Data On Tap) is the newest operating system for the NetApp. It also supports the newer SMB protocols. I also tried the experiment with MKS Toolkit 8.6 and in both cases, it takes around .1 seconds. > -----Original Message----- > From: cygwin-ow...@cygwin.com [mailto:cygwin-ow...@cygwin.com] On > Behalf Of William M. (Mike) Miller > Sent: Thursday, January 21, 2016 10:53 AM > To: cygwin@cygwin.com > Subject: Re: Performance of "ls -F" > > On Thu, Jan 21, 2016 at 10:44 AM, Achim Gratz <strom...@nexgo.de> > wrote: > > I am finding a large performance gap between plain "ls" and "ls -F" in > > a directory with many files on a network share (NetApp disguised as > > NTFS if that matters). This has been there for quite a while, I've > > just now realized what the reason was (I have "ls -F" as an alias for > > "ls" in my interactive shells). In a directory with 1300 files, a > > plain "ls" completes in 0.3s, while "ls -F" requires about 95s. > > Determining the file class seems to require around 70...90ms per file, > > which I can confirm also for directories with a lot less files. > > What's involved in that determination that takes such a long time? > > The overhead appears to be in checking for executable files; using --file-type > instead of -F, which just omits the '*' category, reduces the time for ls in > one > of my (local) large directories from over one second to 0.04 seconds. > > -- > William M. (Mike) Miller | Edison Design Group william.m.mil...@gmail.com > > -- > Problem reports: http://cygwin.com/problems.html > FAQ: http://cygwin.com/faq/ > Documentation: http://cygwin.com/docs.html > Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
