Hi David,

Diff rendering itself is fairly speedy, particularly on a machine like you're 
using. It takes a lot less time than that on some of the ones I've seen with 
1/4th of the RAM and a single CPU.

I'd investigate the SVN server. If it's taking a progressively longer period of 
time, perhaps there's something going on there.

If you enable logging in Review Board and view the diff, you will see several 
entries in the logs detailing the amount of time various diff-building 
operations take. For instance, the amount of time it's taking to fetch files 
from the SVN repository, the amount of time it's taking to render the diff, 
etc. Knowing what these numbers look like will tell me a lot.

Also, to check, are you using a memcached server, and if so, can you confirm it 
is being used? (There are statistics shown for it in the administration UI.)

Christian

--  
Christian Hammond - christ...@beanbaginc.com  
Review Board - https://www.reviewboard.org  
Beanbag, Inc. - https://www.beanbaginc.com

-----Original Message-----
From: David Carson <dccar...@gmail.com>
Reply: reviewboard@googlegroups.com <reviewboard@googlegroups.com>>
Date: October 9, 2014 at 11:50:49 AM
To: reviewboard@googlegroups.com <reviewboard@googlegroups.com>>
Subject:  rendering "diff view" very slow

> I am setting up 2.0.8 to be deployed very shortly. The only major hurdle
> is that the switch to the "diff view" for a review request with 10 or more
> files is very slow. I would anticipate users wanting to switch back and
> forth between "review view" and "diff view" so I must figure this out
> before deploying.
>  
> For a typical review with 20 files, each file being perhaps 2K lines long,
> and a diff that when downloaded is about 200K bytes, this is what I see:
>  
> - click on "View Diff" in upper right corner
> - first file or two renders quickly
> - 3-10 take a few seconds each
> - 11-20 get progressively slower, taking 5 or more seconds
> - switching to diff view always takes this long, not just the first time
> the "diff view" is rendered
>  
>  
> This seems excessively slow for the size of the files, the proximity of the
> RB server to the SVN server (same switch!) and the size of the diff. For
> large diffs, or for cases when it is necessary to switch back and forth
> between the two views, this becomes almost unusable.
>  
> Any ideas what I ought to look for?
>  
> I'm running:
>  
> - ReviewBoard 2.0.8
> - CentOS 7.0
> - older Dell server
> - 16GB RAM
> - Intel Xeon 3GHz, 2 CPUs, 4 cores each
>  
> Thanks.
>  
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