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Date: Tue, 25 Oct 2011 21:00:11 +0100
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 <CABvT1DGrjPcv9iBzOCbgEUSmpdr2c+qFi5UGAWJNt5zxYPpaxA@mail.gmail.com>
Subject: Re: High latency (40ms) and low request rate (10 rps) under windows
From: Robert Newson <rnewson@apache.org>
To: user@couchdb.apache.org
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My guess would be fsync().

B.

2011/10/25 Konstantin Cherkasov <coxx@imarto.net>:
> Hi!
>
> I installed CouchDB 1.1.0 on Windows (Winows 7, 32 bit) and tried to
> test performance using ab.exe
> (Apache Benchmark http://httpd.apache.org/docs/2.2/programs/ab.html)
>
> ab.exe -k -c 1 -n 1000 -p ab.json -T "application/json" http://localhost:=
5984/bench
>
> where ab.json contains the simplest document {"value": "test"}.
>
> This utility do 1000 POSTs with no concurency (-c 1) in single
> connection (-k for keepalive).
>
> On my laptop (it's NOT low cost netbook) I got 10 requests per second.
> So it is 0.1 second per single request.
> And CPU and HDD utilization is actually ZERO.
>
> I was just wondering what exactly CouchDB doing all this time
> (0.1 second) with single little record?
>
> As the utilization of CPU and HDD is 0%, I believe that they are not the =
bottleneck.
>
> So where is bottleneck?
>
>
>
> P.S.
> All test I did with delayed_commits =3D false.
> And I tried socket_options =3D [{nodelay, true}]
>
> --
> =A0Konstantin Cherkasov
>
>