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Re: Performance of 1.7

On Wed, May 07, 2008 at 10:56:19PM -0600, Rob Bosch wrote:
>I've been testing cygwin 1.7 on Server 2008 with rsync.  First, the install
>went flawlessly.  I'm just using a standard path of E:\ fstab
>Compiling rsync worked without a hitch.  The rsync version is 3.02 with the
>preallocate patch applied.  The patch takes advantage of the posix_fallocate
>There have been two major improvements I've seen with the 1.7 build on
>Server 2008:
>- The long file name errors that used to always be a problem are no longer
>there which is great news.
>- The overall I/O performance is much higher.  I don't have hard statistics
>but have been watching throughput on the SAN connected to the server.  With
>old cygwin and Server 2003 I was lucky to get sustained throughput of
>40M-50M.  Now I'm seeing throughput of 100M-120M all the time with bursts
>much higher.  It is possible the performance gain is helped by Server 2008
>as I have not attempted to run the old cygwin on 2008 for a true comparison.
>I think a lot of it is also in the cygwin version since I'm sending the
>email to that list. :)
>Sorry I don't have any more hard data as we continue testing 1.7. Thought
>I'd at least let you know some of the nice things I'm seeing.

If you're using pipes in any capacity I would expect that you'd see some
improvement in throughput since I rewrote the I/O handling there to remove
the old head-standing which was necessary for Windows 9x.


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