Mailing-List: contact user-help@couchdb.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@couchdb.apache.org
Received-SPF: pass (nike.apache.org: domain of bcitrin@gmail.com designates
 209.85.192.180 as permitted sender)
MIME-Version: 1.0
In-Reply-To: 
 <CAHdjipLAV4hRQH4cR3kUuB36nGuukpc-wzwMD-c4d7Ug-N3LxA@mail.gmail.com>
References: 
 <CAOxguM3Kt+fgyWUU794khL3UG2T=K3FJaf7Jo4pkCTTtCaDKHQ@mail.gmail.com>
	<CAHdjipLAV4hRQH4cR3kUuB36nGuukpc-wzwMD-c4d7Ug-N3LxA@mail.gmail.com>
Date: Sat, 26 Oct 2013 18:05:44 +0300
Message-ID: 
 <CAOxguM1a8kiOmV9QnV64rrDx-39O_mPvpowFDCqT85ovoQjQ8w@mail.gmail.com>
Subject: Re: Finding the right value for compaction configuration parameters
From: Boaz Citrin <bcitrin@gmail.com>
To: user@couchdb.apache.org
Content-Type: multipart/alternative; boundary=047d7bd6b2ae8102b104e9a6337c

--047d7bd6b2ae8102b104e9a6337c
Content-Type: text/plain; charset=ISO-8859-1

Hi Alexander,

Yes, I have some numbers, do you want me to share here or somewhere else?

Best,

Boaz


On Mon, Oct 21, 2013 at 12:32 AM, Alexander Shorin <kxepal@gmail.com> wrote:

> Hi Boaz!
>
> On Fri, Oct 18, 2013 at 12:57 AM, Boaz Citrin <bcitrin@gmail.com> wrote:
> > Testing database compaction with various doc_buffer_size values I get
> > completely different results.
> > Documentation is fairly vague, so I wonder how to choose the right value;
> > What parameters affect this - HD buffer size, average doc size,
> > database size, fragmentation, etc... ?!
> >
> > Same goes for view compaction and keyvalue_buffer_size.
>
> These parameters does affect on what they are named: they defines
> buffer size for copying data from db/view file to the .compact one.
> What information you think is missed?
>
> > (For me the the compaction with default values was many times slower
> > than with the values that gave the faster compaction).
>
> All numbers have their cost: large buffers requires more memory while
> they reduces I/O operations and vice versa. Much likely, that default
> values wouldn't provide you high performance since they aimed to fit
> everyone, but that's why you may tweak them for your needs (:
>
> I believe, that it's possible to revise them, but first need to
> collect information in what environment which values are effective and
> which are not. Would you like to help us with that?
>
>
> --
> ,,,^..^,,,
>

--047d7bd6b2ae8102b104e9a6337c--