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Date: Thu, 29 Jan 2009 16:30:49 -0500
Message-ID: <e2111bbb0901291330y51e9802bvff5a736ecac47771@mail.gmail.com>
Subject: Re: CouchDB huge performance difference between Mac OS / Linux
From: Paul Davis <paul.joseph.davis@gmail.com>
To: user@couchdb.apache.org
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Also discussing on IRC, we're wondering if the view is actually built
correctly and something else is going wrong. An easy method to debug
this if you get a copy of trunk, Futon has a panel that shows you
actively running tasks so you'll be able to keep an eye on what
couchdb is actually doing in terms of things like view generation and
compaction. (replication is on the agenda)

HTH,
Paul Davis

On Thu, Jan 29, 2009 at 4:15 PM, Paul Davis <paul.joseph.davis@gmail.com> wrote:
> Without thinking too hard, could this be an effect of fsync in a VM?
> If you're feeling experimentally inclined, you could try and see the
> performance after commenting out the two calls to fsync in write
> header to see what happens.
>
> Also, the idea that fsync is slow in a VM could be outdated. Its just
> one of those fuzzy memories of reading something somewhere as opposed
> to any personal experience.
>
> HTH,
> Paul Davis
>
> On Thu, Jan 29, 2009 at 3:40 PM, Niket Patel <nexneo@me.com> wrote:
>> While views are generating first time on 6000 docs size db. ( same database
>> for both machines )
>> Mac ( 2Ghz core 2 duo, 2 GB ) take few seconds
>> Ubuntu Linux ( 2.4 Ghz 1.7 GB ) on Amazon takes forever ( 60 mins still
>> waiting )
>>
>> CouchDB version : 0.9.0a738990-incubating
>> Erlang Version :
>> - Mac : Erlang (BEAM) emulator version 5.6.5 [source] [smp:2]
>> [async-threads:0] [kernel-poll:false]
>> - Linux : Erlang (BEAM) emulator version 5.6.5 [source] [async-threads:0]
>> [hipe] [kernel-poll:false]
>>
>> One observation, First "couchjs" and "beam" processes are running when view
>> generation starts after few second couchjs goes away but 'beam'  (
>> /usr/local/lib/erlang/erts-5.6.5/bin/beam ) keep running consuming 45% CPU
>> all time
>>
>