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Date: Thu, 17 Jan 2013 15:27:40 +0300
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Subject: Re: general question about couch performance
From: Alexander Shorin <kxepal@gmail.com>
To: user@couchdb.apache.org
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Hi Mark!

Have you tried to tweak httpd options? In local.ini there is their definition:

[httpd]
; Options for the MochiWeb HTTP server.
;server_options = [{backlog, 128}, {acceptor_pool_size, 16}]
; For more socket options, consult Erlang's module 'inet' man page.
;socket_options = [{recbuf, 262144}, {sndbuf, 262144}, {nodelay, true}]

For example, disabling Nagle algorithm through {nodelay,true} socket
option may dramatically change rps value[1].

That is about network operations. For disk one there is
delayed_commits option, but it requires to suffer data durability for
some speed and actually it's not recommended to keep them him with
true value.

[1]: http://code.google.com/p/couchdb-python/issues/detail?id=193#c22
--
,,,^..^,,,


On Thu, Jan 17, 2013 at 12:17 AM, Mark Hahn <mark@hahnca.com> wrote:
> My couchdb is seeing a typical request rate of about 100/sec when it is
> maxed out.  This is typically 10 reads/write.  This is disappointing.  I
> was hoping to 3 to 5 ms per op, not 10 ms.  What performance numbers are
> others seeing?
>
> I have 35 views with only 50 to 100 entries per view.  My db is less than a
> gigabyte with a few thousand active docs.
>
> I'm running on a medium ec2 instance with ephemeral disk.  I assume I am IO
> bound as the cpu is not maxing out.
>
> How much worse would this get if the db also had to handle replication
> between multiple servers?