Rsync Performance In Windows

[Chris McKeever]

Greger.. 
I replaced the rsync.exe with the one from your link, it relieved the
windows CPU some (from 100% to 98% with flucuation to 100%).

I also took the advice of using the -u switch.  From the man:

-u, --update                update only (don't overwrite newer files)

I just want to make sure I am interpretting this flag correctly.  On the
receiving end, if there is a file that is newer than on the sending end, it
wont update, but if the sending end file is newer or non-existant then it
will send?

This reduced the CPU load tremendously and also reduced the transfer time to
something very acceptable.  I just want to make sure it is still doing what
I wanted it to.


Thanks for all your help


> > -----Original Message-----
> > From: Greger Cronquist [mailto:greger_cronquist at yahoo.se]
> > Sent: Monday, June 16, 2003 2:42 PM
> > To: _Chris McKeever_
> > Cc: rsync at lists.samba.org
> > Subject: Re: Rsync Performance In Windowsv

All you need to run rsync properly is rsync.exe, cygwin1.dll and cygpopt- 
0.dll. There is no difference in performance if you do a full cygwin 
install or not. However, I suggest you try and download the version I 
compiled and see if it makes any difference. It does for me. (It buffers 
the IO calls so that the number of cygwin system calls are minimized.)

Regards, Greger

> -----Original Message-----
> From: Chris McKeever 
> Sent: Monday, June 16, 2003 5:29 PM
> To: 'Greger Cronquist'; _Chris McKeever_
> Cc: rsync at lists.samba.org
> Subject: RE: Rsync Performance In Windows
> 
> 
> Thanks for your reply!
> 
> > -----Original Message-----
> > From: Greger Cronquist [mailto:greger_cronquist at yahoo.se]
> > Sent: Monday, June 16, 2003 2:42 PM
> > To: _Chris McKeever_
> > Cc: rsync at lists.samba.org
> > Subject: Re: Rsync Performance In Windows
> > 
> > 
> > Did you compile from the sources, or did you grab the cygwin binary?
> 
> I just did the standard install (which I dont think was a 
> full source compile)
> > 
> > I suggest you build it from the sources and apply the 
> > "craigb-perf.diff" 
> > patch which is in the patches directory in the 2.5.6 
> > distribution. This 
> > patch makes all the difference for Windows (system calls cost a lot 
> > under cygwin).
> > 
> 
> as I said, I am not running cygwin on that machine, only 
> rsync which I copied from the other cygwin install.  Do you 
> suggest that I run cygwin on the windows box that I am using rsync?
> 
> > If you don't want to compile it yourself, I have an older version 
> > (2.5.6cvs from august last year, works nicely) available at 
> > http://www.niradynamics.se/~nira_greger/
> > 
> > /Greger
> > 
> > _Chris McKeever_ wrote:
> > 
> > >Has anyone else experienced high CPU usage when using RSYNC 
> > in windows 2000
> > >server?  I am using the rsync.exe (and applicable DLL's) 
> > from the cygwin
> > >installation (I am not however running cygwin on this machine).
> > >
> > >The linux machine connecting to the windows rsync daemon has 
> > a very low
> > >performance hit when the session is running (see below).  
> > However, the
> > >windows machine, which has a much faster CPU hits a CPU 
> > usage of 100%.
> > >
> > >If anyone else has seen this, and/or can help alleviate the 
> > issue, that
> > >would be great.  I am using rsync to backup across our 
> > network our branch
> > >file servers.
> > >
> > >CPU states:  1.5% user,  3.1% system,  0.0% nice, 95.2% idle
> > >Mem:   126636K av,  124008K used,    2628K free,       0K 
> > shrd,   26580K
> > >buff
> > >Swap: 1020560K av,    7360K used, 1013200K free              
> >      32044K
> > >cached
> > >
> > >  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   
> TIME COMMAND
> > >18600 root      15   0  7544 7544   704 R     3.1  5.9   0:05 rsync
> > >18644 root      15   0  1040 1040   832 R     1.1  0.8   0:02 top
> > >18557 root      15   0  1740 1680  1428 S     0.1  1.3   0:00 sshd
> > >
> > >  
> > >
> > 
> > 
>