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From Emmanuel Lecharny <elecha...@gmail.com>
Subject Re: Help with performance issues
Date Fri, 15 Aug 2008 09:29:20 GMT
Hi,

have you used a profiler to see if you have some bottleneck, and if so, 
where ?

Johan Haleby wrote:
> Hi,
>
> I've basically tried to ask this question before (
> http://mina.markmail.org/message/bjpiogngdaxf3fyc?q=Buffering+question) but
> unfortunately I didn't manage to get much further. So I'll try to refrain my
> question a little bit in the hope to get some more answers.
>
> I'm using Mina to broadcast lots of incoming data from external hardware
> devices to connected clients. We need a write-throughput of at least 40
> Mbit/s and right now we're reaching _at most_ about 10MBits/s (but usually
> it's just around 3Mbit/s). The data is received by the Mina server as binary
> data but is converted into strings (the data is actually utf-8 encoded
> strings). When a new line has been detected, some meta-data is added to the
> detected row and the whole row is persisted to disk as well as being sent to
> all clients registered to receive data from this device. For each line one
> or more regular expression filters are applied (since the clients are only
> interested in certain data). Right now I'm using session.write(rowData) for
> each new line for each client who's registered as interested. But as soon as
> we get many clients (> 30 or so) the performance is declining. In some tests
> we've done it takes several minutes for the clients to receive all data
> after the hardware device has been shutdown. For encoding I'm using the
> TextLineEncoder and I suspect I may be suffering from the same issue as in
> http://mina.markmail.org/message/5xtmwbode6cgifox?q=performance+file("[TextLineEncoder]
> create a bunch of (small) IoBuffer objects for each
> individual line (or message object) which are then put into the writer's
> queue. This is quite inefficient since thousand of small IoBuffer objects
> will be sent over the wire instead of creating one buffer with a more
> appropriate buffer size"). I've tried using the mergeAll method but I don't
> see much difference, but mabey I'm not using it correctly. I've also taken a
> look at the Mina FTP server project. Here the data channels are made up of
> input and outputstreams stored in the session. Perhaps I'm better of using
> this approach for sending the data instead of going through the
> TextLineEncoder? I'm using Mina 1.1.7.
>
> What do you think?
>
> /Johan
>
>   


-- 
--
cordialement, regards,
Emmanuel L├ęcharny
www.iktek.com
directory.apache.org



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