> Are there other open source tools you recommend besides Ethereal?
Some other tools that are useful for diagnosing performance issues:
On Windows:
http://www.microsoft.com/technet/sysinternals/utilitiesindex.mspx
Especially the Process Explorer which can display the I/O usage of a single
process in real-time.
The Windows Server Performance tool
On Linux there are various hard-to-use tools that write a bunch of text (sar,
var, etc.), but I haven't tried these for several years, so maybe they have
nice GUI's now.
For Java there are several profiling tools. I've had good luck with JProbe
from Quest. Eclipse also has one (install the TPTP plug-ins), but I found it
to either lock up or be difficult to get the data I needed. And don't forget,
these profilers slow down the byte-code execution by about 30X, and so make any
I/O look 1/30 smaller in proportion than it actually is in an unprofiled,
byte-compiling JVM (i.e. "java -server").
Greg
