Speed on Windows for big repos

[Patrick Mézard]

Adrian Buehlmann a écrit :
> The relative speed of Mercurial 0.9.5 on Windows XP compared to on Linux seems 
> to be rather weak for big repositories:
> 
> See the Netbeans repo test runs on:
> http://www.selenic.com/mercurial/wiki/index.cgi/RepoSamples
> 
>    Files: 74'713
>    Changesets: 64'888
>    Total Revisions: 325'131
> 
> Local "clone --pull":
> 
>    Ubuntu 7.10 on Core 2 Duo, 2GB RAM:             260 sec (< 5 min)
>    Windows XP SP2, 2.4 GHz Pentium 4, 1 GB RAM:  4'150 sec (> 1 h  )
> 
> Ok, not the same hardware, but a factor of nearly 16?
> 
> I did the Windows run using the batteries included installer (thanks to Jesse 
> for posting the Ubuntu test data). Windows CPU load was rather low, peak memory 
> usage far below 200 MB. Per my personal paranoia, I suspect that hg was mostly 
> waiting for disk writes to complete.
> 
> Why is Mercurial on Windows really that much slower than on Linux?
> 
> How could this be improved?

If you can build mercurial on Windows (and install pywin32), an --lsprof report would be useful.
I will try to add more numbers comparing WinXP and MacOSX.

--
Patrick Mézard