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Re: ls -lR too slow

Dave Korn wrote:
Vinod Gupta wrote:

When I do "ls -lR /cygdrive/z" it takes very long.
There are only about 700 files on Z: totalling only 100 MB. When I
monitor network counters on laptop, I see that a whopping 90 MB were
downloaded for a payload (file list) of only 60 KB. Out of curiosity, I
did the same experiment between two linux machines configured as NFS

Perhaps more instructive would be to compare with typing "DIR Z:" in a DOS
prompt. How much time does that take, and how much network traffic does it
generate, by comparison?

If the OP is looking for truer comparisons with Linux, I would say that using SAMBA on Linux is a better test than NFS. Of course, Cygwin is expected to be slower than Linux regardless.

In terms of overall time/traffic with Cygwin, I'd recommend comparing the
results of "DIR Z:" that Dave recommends above to "ls /cygdrive/z" (or
"DIR /S Z:" to "ls -R /cygdrive/z"). If you need to use "-l" with "ls"
and remote SAMBA shares, I'd recommend adding "smbntsec" to your "CYGWIN"
environment variable. This should limit file accesses that "-l" (and other
flags) can require. See the link below for more info:


Larry Hall                    
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746


"smbntsec" made a huge difference, a factor of 10x! "ls -lR /cygdrive/z" still transferred 10 MB, 50x more than "DIR /S Z:" but far better than 400x it was doing with "nosmbntsec". It improves rsync too which does some thing similar to "ls -lR" to get file mtime and size etc to filter files. I think 50x factor sounds still too high. I thought the Cygwin overheads were of the order of 3x or so. Can we squeeze another order of magnitude?

Thanks Larry,

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