Thanks. I looked into our pipeline, but we only have the default processors (root, 
spam, transport and error). We could try to remove something, but I'm not sure it 
would make a big difference, and anyway the flexibility of the pipeline is one of the 
features we like in James, and if we can't use it because of performance problems it 
puts a dent in the case for using it in the first place.
Anyway, one of the engineers has a bit more info about what's using so much CPU, you 
might find this useful.

Here's a call stack of one of the threads that appears to be using a lot of CPU with 
large messages.

  [1] java.net.SocketInputStream.socketRead0 (native method)
  [2] java.net.SocketInputStream.read (SocketInputStream.java:129)
  [3] java.io.BufferedInputStream.read1 (BufferedInputStream.java:220)
  [4] java.io.BufferedInputStream.read (BufferedInputStream.java:277)
  [5] sun.nio.cs.StreamDecoder$CharsetSD.readBytes (StreamDecoder.java:408)
  [6] sun.nio.cs.StreamDecoder$CharsetSD.implRead (StreamDecoder.java:450)
  [7] sun.nio.cs.StreamDecoder.read (StreamDecoder.java:182)
  [8] java.io.InputStreamReader.read (InputStreamReader.java:167)
  [9] java.io.BufferedReader.fill (BufferedReader.java:136)
  [10] java.io.BufferedReader.read (BufferedReader.java:157)
  [11] org.apache.james.util.CRLFTerminatedReader.readLine 
(CRLFTerminatedReader.java:139)
  [12] org.apache.james.smtpserver.SMTPHandler.readCommandLine (SMTPHandler.java:546)
  [13] org.apache.james.smtpserver.SMTPHandler.handleConnection (SMTPHandler.java:399)
  [14] org.apache.james.util.connection.ServerConnection$ClientConnectionRunner.run 
(ServerConnection.java:465)
  [15] org.apache.james.util.thread.ExecutableRunnable.execute 
(ExecutableRunnable.java:89)
  [16] org.apache.james.util.thread.WorkerThread.run (WorkerThread.java:125)

Note that the engineer set the jvm to -Xms80m -Xmx80m.  It doesn't appear to make a 
difference.


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