WebLogic 6.0 performance on Solaris (Excessive polling)

Question

We have a problem with SunOs 5.8, multi (2) CPU, 1GB memory Weblogic 6.0 sp1 and
java 1.3.0.
While running some benchmarks we realized that the tests run much faster (25%-40%
faster) on a NT Pentium III 800 MHz desktop with 256MB RAM than on our Sun Ultra-250
with the above configuration.
So, we decided to do some profiling by turning on hprof (-X:runhprof:cpu=samples,depth=12)
and realized that over 50% of the time is spent in polling the sockets (weblogic.socket.PosixSocketMuxer.poll).
On NT, only 0.23% time is spent on the same activity. I do not know if on NT WebLogic
uses a different IPC model (select vs. interrupt) but the time taken on Solaris
doing polls is outrageous. I am wondering if anybody else out there has experienced
the same problem? Any insights you have to share on this will be appreciated.
TIA,
-Anil Singhal

Answer 1

The Xprof output is misleading - this does not mean that 50% of
the CPU is spent on polling sockets. It simply means that 50% of the thread samples
were in a polling method (probably waiting, not running).
Yes, I believe that an 800MHz PIII would blow away an ES-250 which runs at less
that 300MHz. So you have 2CPU -> 600MHz. Then
(800-600)/800 = 25% which is what you get.
Mike
"Michael Girdley" <----> wrote:
Are you using the performance pack? If not, you should.
Michael Girdley
BEA Systems
Learning WebLogic? http://learnweblogic.com
"Anil Singhal" <[email protected]> wrote in message
news:3adc4f27$[email protected]..
We have a problem with SunOs 5.8, multi (2) CPU, 1GB memory Weblogic6.0
sp1 and
java 1.3.0.
While running some benchmarks we realized that the tests run much faster(25%-40%
faster) on a NT Pentium III 800 MHz desktop with 256MB RAM than onour Sun
Ultra-250
with the above configuration.
So, we decided to do some profiling by turning on hprof(-X:runhprof:cpu=samples,depth=12)
and realized that over 50% of the time is spent in polling the sockets(weblogic.socket.PosixSocketMuxer.poll).
On NT, only 0.23% time is spent on the same activity. I do not knowif on
NT WebLogic
uses a different IPC model (select vs. interrupt) but the time takenon
Solaris
doing polls is outrageous. I am wondering if anybody else out therehas
experienced
the same problem? Any insights you have to share on this will beappreciated.
TIA,
-Anil Singhal