Improve http performance?

[Jiming Liu]

Hi Tee,

I tried to test the performance of Netty(3.2alpha3) and Tomcat, and
dispointedly found that Netty is not much faster than tomcat as I expected.

The result is here,
http://jiming.javaeye.com/blog/618026

Today, I profiled the netty example by JProfiler and found that it is
possible to improve the performance.
following is partial result of JProfiler, wish could be useful.

StackTrace of havest method one:
  37.7% - 37,486 ms - 10,001 inv.
org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream
  37.7% - 37,435 ms - 10,001 inv.
org.jboss.netty.example.http.snoop.HttpRequestHandler.messageReceived
  36.8% - 36,538 ms - 10,001 inv.
org.jboss.netty.example.http.snoop.HttpRequestHandler.writeResponse
  20.4% - 20,253 ms - 10,001 inv.
org.jboss.netty.channel.AbstractChannel.write
  20.3% - 20,198 ms - 10,001 inv. org.jboss.netty.channel.Channels.write
  20.3% - 20,156 ms - 10,001 inv. org.jboss.netty.channel.Channels.write
  19.9% - 19,733 ms - 10,001 inv.
org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream
  19.7% - 19,546 ms - 10,001 inv.
org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream
  19.6% - 19,453 ms - 10,001 inv.
org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream
  11.7% - 11,595 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageEncoder.encode
  3.7% - 3,667 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpResponseEncoder.encodeInitialLine
  3.4% - 3,337 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageEncoder.encodeHeaders
  2.3% - 2,311 ms - 10,001 inv.
org.jboss.netty.buffer.ChannelBuffers.wrappedBuffer
  0.7% - 738 ms - 20,002 inv.
org.jboss.netty.buffer.DynamicChannelBuffer.writeByte
  0.7% - 662 ms - 10,001 inv.
org.jboss.netty.buffer.ChannelBuffers.dynamicBuffer
  0.3% - 273 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpCodecUtil.isTransferEncodingChunked
  7.6% - 7,560 ms - 10,001 inv. org.jboss.netty.channel.Channels.write
  12.1% - 11,971 ms - 10,001 inv.
org.jboss.netty.channel.DefaultChannelFuture.addListener
  1.7% - 1,665 ms - 10,001 inv.
org.jboss.netty.buffer.ChannelBuffers.copiedBuffer
  0.7% - 662 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.DefaultHttpMessage.setHeader
  0.6% - 557 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.DefaultHttpMessage.setContent
  0.5% - 506 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpHeaders.isKeepAlive
  0.4% - 349 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.DefaultHttpMessage.getHeader
  0.3% - 257 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.DefaultHttpResponse.<init>

StackTrace of havest method two:
  34.9% - 34,613 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.decode
  34.8% - 34,562 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.decode
  26.0% - 25,807 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.readHeaders
  21.2% - 21,087 ms - 40,004 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.readHeader
  19.2% - 19,087 ms - 770,077 inv.
org.jboss.netty.handler.codec.replay.ReplayingDecoderBuffer.readByte
  8.8% - 8,718 ms - 770,077 inv.
org.jboss.netty.buffer.AbstractChannelBuffer.readByte
  5.4% - 5,318 ms - 770,077 inv.
org.jboss.netty.buffer.DynamicChannelBuffer.getByte
  1.8% - 1,797 ms - 770,077 inv.
org.jboss.netty.buffer.HeapChannelBuffer.getByte
  5.1% - 5,102 ms - 770,077 inv.
org.jboss.netty.handler.codec.replay.ReplayingDecoderBuffer.checkReadableBytes
  2.0% - 1,991 ms - 30,003 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.splitHeader
  1.6% - 1,569 ms - 30,003 inv.
org.jboss.netty.handler.codec.http.DefaultHttpMessage.addHeader
  0.3% - 343 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpHeaders.getContentLength
  0.3% - 293 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.DefaultHttpMessage.isChunked
  4.4% - 4,378 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.readLine
  0.9% - 885 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.splitInitialLine
  0.8% - 796 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpRequestDecoder.createMessage
  0.7% - 738 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.skipControlCharacters
  0.7% - 696 ms - 30,003 inv.
org.jboss.netty.handler.codec.replay.ReplayingDecoder.checkpoint(java.lang.Enum)
  0.4% - 417 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpMessageDecoder.reset
  0.3% - 286 ms - 10,001 inv.
org.jboss.netty.handler.codec.http.HttpHeaders.getContentLength




谢谢

刘继明
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