Re: svn commit: r12146 - trunk/subversion/libsvn_ra_dav

Philip Martin <philip@codematters.co.uk> writes:

> Ben Collins-Sussman <sussman@collab.net> writes:
>
>> On Dec 4, 2004, at 10:06 AM, philip@tigris.org wrote:
>>>
>>> * subversion/libsvn_ra_dav/fetch.c (svn_ra_dav__do_switch): Disable the
>>> resource-walk.
>>
>> Cool. Have you tried any performance tests after this change? I
>> mean, after switching a tree, are subsequent commits "really slow"
>> without the vrl-caches?
>
> I tested updates, not commits. For an update that changes all 420
> files in a working copy the vrl-cache makes so little difference that
> it's lost in the measuement noise. That's over an otherwise quiet
> LAN. Are commits likely to be different?

Yes, commits are different. My test wc has 420 files, if I modify
them all then a commit typically takes

$ time svn ci wc -m "" > /dev/null

real 0m19.691s
user 0m4.293s
sys 0m2.618s

After a switch it typically takes

$ time svn ci wc -m "" > /dev/null

real 0m31.503s
user 0m7.358s
sys 0m3.113s

So that about 50% slower but I think the correctness arguments justify
that regression.

Perhaps it would be possible to detect a 1.2 server and have the
client conditionally request the resource walk?

-- 
Philip Martin
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