Performance tuning options for undertow

[lmajano]

@denuno If you see the Undertow.Builder class there are several options for performance tuning. Is there a way to tap into them via CommandBox passthrough?

http://undertow.io/javadoc/1.3.x/io/undertow/Undertow.Builder.html

The ones I am interested are:

• setBufferSize(int bufferSize)
• setBuffersPerRegion(int buffersPerRegion)
• setDirectBuffers(boolean directBuffers)
• setIoThreads(int ioThreads)
• setWorkerThreads()

[denuno]

I've added options for setting these (not buffers per region tho, it doesn't do anything anymore), and for posterity, here is how the these things get set if you don't change them:

            ioThreads = Math.max(Runtime.getRuntime().availableProcessors(), 2);
            workerThreads = ioThreads * 8;
            long maxMemory = Runtime.getRuntime().maxMemory();
            //smaller than 64mb of ram we use 512b buffers
            if (maxMemory < 64 * 1024 * 1024) {
                //use 512b buffers
                directBuffers = false;
                bufferSize = 512;
            } else if (maxMemory < 128 * 1024 * 1024) {
                //use 1k buffers
                directBuffers = true;
                bufferSize = 1024;
            } else {
                //use 16k buffers for best performance
                //as 16k is generally the max amount of data that can be sent in a single write() call
                directBuffers = true;
                bufferSize = 1024 * 16;
            }

So we have --buffer-size int --direct-buffers true|false --io-threads int --worker-threads int command line options now.