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Message-ID: <4FB6B7BC.9080403@cedarsoft.com>
Date: Fri, 18 May 2012 22:57:32 +0200
From: Johannes Schneider <mailings@cedarsoft.com>
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To: user@couchdb.apache.org
Subject: Re: Performance decrease from 1.0.1 to 1.2.0
References: <4FB69C07.7070705@cedarsoft.com>
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Thanks for the hint. Will try it out.
But I am sure, there is a good reason for enabling  that algorithm?


On 18.05.2012 22:27, Adam Kocoloski wrote:
> 40ms indicates Nagle's algorithm is kicking in and trying to reduce
> the number of packets sent over the wire.  Try setting the
> following in the .ini configuration:
> 
> socket_options = [{nodelay, true}]
> 
> I believe that was the default in 1.0 and has changed since then.
> Cheers, Adam
> 
> On May 18, 2012, at 2:59 PM, Johannes Schneider wrote:
> 
> Hi guys,
> 
> 
> I am using Ubuntu 12.04 (x86_64) with the default CouchDB
> installation. And I have created some very small tests to check the
> performance.
> 
> It is just one simple "get".
> 
> 
> With 1.0.1 it used to take about 1 or 2 milli seconds. Since the 
> upgrade the same GET takes about 40 millis. I am quite sure that
> there is some type of misconfiguration... Anybody has a hint for
> me? Are there any special configuration options that changed from
> 1.0.1 to 1.2.0 (nothing found in release notes)? Or did Canonical
> some magic?
> 
> 
> 
> Debug output in couch.log: [Fri, 18 May 2012 18:55:35 GMT] [debug]
> [<0.400.0>] 'GET' 
> /couch_unit_test_1337367299363_55042/_design/all/_view/byTypeAndId?startkey=%5B%22lens%22%5D&include_docs=true&endkey=%5B%22lens%22,%7B%7D%5D
>
> 
{1,
> 
> 
> 1} from "127.0.0.1" Headers: [{'Accept',"text/html, image/gif,
> image/jpeg, *; q=.2, */*; q=.2"}, {'Connection',"keep-alive"}, 
> {'Host',"localhost:5984"}, {'User-Agent',"Java/1.6.0_26"}] [Fri, 18
> May 2012 18:55:35 GMT] [debug] [<0.400.0>] OAuth Params: 
> [{"startkey","[\"lens\"]"}, {"include_docs","true"}, 
> {"endkey","[\"lens\",{}]"}] [Fri, 18 May 2012 18:55:35 GMT] [debug]
> [<0.400.0>] request_group {Pid, Seq} {<0.402.0>,5} [Fri, 18 May
> 2012 18:55:35 GMT] [info] [<0.400.0>] 127.0.0.1 - - GET 
> /couch_unit_test_1337367299363_55042/_design/all/_view/byTypeAndId?startkey=%5B%22lens%22%5D&include_docs=true&endkey=%5B%22lens%22,%7B%7D%5D
>
> 
200
> 
> 
> The map function. ------------------------------ function( doc ) { 
> var type = doc['@type']; var id = doc['_id'];
> 
> if ( type == null || id == null ) { return }
> 
> emit( [type, id] ); } ------------------------------
> 
> 
> No other documents are available (returns "total_rows":0
> 
> 
> 
> Thanks,
> 
> Johannes
> 
> 

- -- 
Johannes Schneider - blog.cedarsoft.com
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