Hi Trustin,
I have just tried upgrading to 1.0.3 and it didn't seem to make a lot of
difference unfortunately.
To upgrade to 1.1.0 my application would need to move to JRE 1.5 so I
would lose the 1.4.2 compatibility.
I'm happy to do this, but is it likely to bring me significant
performance gains in this type of application?
Do you think the performance that I am seeing is normal?
Thanks again,
Richard.
--
Trustin Lee wrote:
Hi Richard,
Why don't you upgrade to 1.0.3 or 1.1.0? We want to make sure that we
are not chasing a bug already fixed. :)
Trustin
On 4/19/07, Richard Lowe <[EMAIL PROTECTED]> wrote:
Hi All,
I am using Mina 1.0.0 under JRE 1.4.2 and testing it using a simple
server and client program that I have written. I must say that Mina is
excellent, the API is very easy to work with. I have a performance
question and am hoping that you guys might be able to supply me with an
answer.
My server program starts up and waits for connections on a predesignated
TCP port (I use a class that extends IOHandlerAdapter to send events to
my server thread). Every 1/4 of a second it will write ~ 128 bytes of
data to every connected session if the connection is a new session *or*
the session has successfully responded to a previous 128 byte packet
with a 64 byte packet of its own. I use the following tweaks to help
improve performance:
ByteBuffer.setAllocator(new SimpleByteBufferAllocator());
ByteBuffer.setUseDirectBuffers(false);
My client program (running on a seperate machine) creates 1000 instances
of an IoHandlerAdapter. Every time it receives a 128 byte packet from
the server, it immediately responds with a 64 byte packet.
To summarise, I'm sending 128 bytes per session every 1/4 of a second to
which I am receiving 64 bytes back.
The test 'server' (more accurately desktop) is an AMD Athlon 3200+ (so
not the most powerful) and I am getting around 75% CPU utilisation with
1000 connections.
More specifically:
100: 4%, 200: 10%, 300: 22%, 400: 38%, 500: 43%, 600: 58%, 700: 65%,
800: 66%, 900: 70%, 1000: 75%
The bottleneck seems to be in the Mina layer or below. Is the
performance above what you would consider to be 'optimal' or is there an
obvious way of substantially reducing CPU load?
Ideally I would love to support 2000+ simultaneous connections on this
test machine. Is there a way of achieving this without my CPU fan
flying off it's spindle and my machine setting alight?
Any advice that you can offer would be very much appreciated!
Cheers,
Richard.
