[Directory Wiki] Update of "MinaPerformance" by TrustinLee

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http://wiki.apache.org/directory/MinaPerformance

The comment on the change is:
Added some performance tips

New page:
== Performance Tips ==

Strangely, some modern JVMs seem to perform better with heap buffers than with direct buffers.  Try to set the buffers to be allocated as heap buffers by default:

{{{
ByteBuffer.setUseDirectBuffers( false );
}}}


If you decided to use heap buffers by default, you'd better change the default {{{ByteBufferAllocator}}} to {{{SimpleByteBufferAllocator}}} for even higher performance.  The default allocator, {{{PooledByteBufferAllocator}}}, was created because allocating a direct buffer takes a lot of time comparing to the case of a heap buffer.

{{{
ByteBuffer.setAllocator(new SimpleByteBufferAllocator());
}}}

Additionally, you can adjust the size of the eden (the heap area for young objects in a JVM).  It is known that about 30% of the maximum heap size will be OK in general.  For example:

{{{
java -Xmx1024m -XX:NewSize=300m
}}}

== Impressive Performance Stories ==

Please post your success story on performance.  We'll move your testimonials here to [http://directory.apache.org/subprojects/mina/testimonials.html our web site] periodically.