RE: Significant checkout performance degradation between 1.6.1 and 1.7b2

Hi Mark!

That's interesting news on 1.6.17. I upgraded to the latest stable and rerun my checkout tests. At least the checkout's fast now. Am afraid I don't have any real-world numbers for the other stuff. I'm using an SSD for my daily work, so the local file access during Update/Commit isn't an issue any longer.

Please see my other reply for my benchmark results.

Regards, Michael

From: Mark Phippard [mailto:markphip_at_gmail.com]
Sent: Dienstag, 09. August 2011 20:20
To: Ketting, Michael
Cc: dev_at_subversion.apache.org
Subject: Re: Significant checkout performance degradation between 1.6.1 and 1.7b2

On Tue, Aug 9, 2011 at 4:13 AM, Ketting, Michael <michael.ketting_at_rubicon.eu<mailto:michael.ketting_at_rubicon.eu>> wrote:

I've recently picked up the subversion 1.7 beta 2 build (included in the latest TortoiseSVN beta) and did a checkout of our solution (~10,000 files, ~2,000 folders, ~180MB).
With Subversion 1.6.1, it takes roughly 5 minutes, with Subversion 1.7 beta 2, it takes about 10 minutes.

Is this performance degradation inherent with the use of the centralized SVN information, and thus an intentional tradeoff for the blazing fast Commits/Updates?
Naively, I'd hoped that the checkout speed would get closer to the export-speed with Subversion 1.7, since the Updates are faster, too.

Interestingly, it looks like the export speed also degraded. With Subversion 1.6 it took about 90 seconds, with Subversion 1.7, it now takes 110 seconds.

I re-ran the performance benchmarks using 1.6.17 and 1.7.0-beta3.

Server is running 1.7.0-beta3 and running on Solaris x86 VM with 1 GB RAM
Accessed server via https://
Server authentication via LDAP (Active Directory)
Clients configured to use Neon.
Client was Windows 7 laptop accessing server via VPN. Latency to server is about 120ms

You can see the results in this spreadsheet:

https://spreadsheets.google.com/spreadsheet/ccc?key=0AqWkwCpe4YoidHVpMlJhR0V3QmdWSThsb2c5d1FVV3c&hl=en_US

I highlighted in green the areas where SVN 1.7 is significantly faster (most everywhere).

There are a couple areas in red where 1.6 is significantly faster. This is on the test where there are about 4-5K icons in a single folder. Checkout/commit with 1.7 are slower but other areas are faster. FWIW, until 1.6.17 this was about 5x slower in 1.6. We backported a bugfix from 1.7 to 1.6.17 that apparently has even more impact in 1.6 than it did in 1.7.

--
Thanks
Mark Phippard
http://markphip.blogspot.com/