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Re: [Proposal] Remove DAV properties cache in ra_serf

From: Ivan Zhakov <ivan_at_visualsvn.com>
Date: Mon, 14 Feb 2011 21:52:45 +0200

On Mon, Feb 14, 2011 at 21:14, C. Michael Pilato <cmpilato_at_collab.net> wrote:
> On 02/14/2011 01:57 PM, Ivan Zhakov wrote:
>> So I'm propose just to remove DAV properties cache from ra_serf.
>> Objections? Comments?
>>
>> PS: See attached patch in case you'd like test performance.
>
[...]

>
> But what is the effect for older servers?  Would it make sense keep the
> cache logic, but conditionally use it only for non-HTTPv2 connections?
>
Mike

It's not easy to measure network performance because of different
environments and etc.

Here is number of requests for simple operations against non-HTTPv2 server:
              serf serf (no-cache) neon
info 7 9 17
ls 7 8 14
log 7 8 13
pl -v 7 8 14

As you see only 1-2 requests are cached. And actually they cannot be
cached because it's PROPFIND of baseline collection of *youngest*
revision. Current ra_serf implementation assumes that property values
doesn't change during all session lifetime (see problem (3)).

-- 
Ivan Zhakov
Received on 2011-02-14 20:53:48 CET

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