Why is cygwin cvs client so slow?
Christopher Warth
csw@broadcom.com
Wed Jan 5 02:30:00 GMT 2005
Can anyone speculate as to why cygwin cvs is so much slower than their
native windows equivalents?
In short, 'cvs update' using cygwin cvs takes 7-9 times as long to do
the same task as a non-cygwin port of cvs from www.cvshome.org/.
To update a missing directory that contains almost 3000 files, cygwin
cvs takes more than 21 minutes. The 'native' cvs from cvshome.com takes
just under 3 minutes to do the same thing on the same file system, from
the same server. Details are below.
Am I missing some environment variable, like export CVS_GO_FAST="yes"?
I hope 700% degradation in performance is too steep a price to pay for
unix-like tools.
-csw at well dot com
# all filesystems are mounted in text mode.
#
$ mount
C:\cygwin\bin on /usr/bin type system (textmode)
C:\cygwin\lib on /usr/lib type system (textmode)
C:\cygwin on / type system (textmode)
c: on /cygdrive/c type system (textmode,noumount)
p: on /cygdrive/p type system (textmode,noumount)
z: on /cygdrive/z type system (textmode,noumount)
# current directory is on am SMB share (served by Samba, I believe)
#
$ pwd
/cygdrive/z/home/user/tot/src/wl
# I am using pserver served by a linux box
#
$ echo $CVSROOT
:pserver:user@somemachine:/projects/cvsroot
# I have up-to-date packages
$ cygcheck -c
Cygwin Package Information
Package Version Status
[...]
base-files 3.1-4 OK
[...]
coreutils 5.2.1-5 OK
[...]
cvs 1.11.17-1 OK
cygutils 1.2.5-1 OK
cygwin 1.5.12-1 OK
[...]
# the cvs from cygwin is version 1.11.17
$ cvs -v
Concurrent Versions System (CVS) 1.11.17 (client/server)
[...]
# remove a directory and let cvs update it again.
$ rm -rf locale
$ time cvs update -d locale
[...2982 files...]
real 21m20.478s
user 0m7.765s
sys 0m38.546s
# the cvs from cvshome.com is also version 1.11.17
$ cyclic-cvs -v
Concurrent Versions System (CVS) 1.11.17 (client)
[...]
# remove a directory and let cvs update it again.
$ rm -rf locale
$ time cyclic-cvs update -d locale
[...2982 files...]
real 2m55.287s
user 0m0.015s
sys 0m0.000s
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