WTC performance

Question

We are testing a Tuxedo8.1 to Weblogic7sp1 link thru WTC, on a Sunfire6800, 4procs-900mhz
machine.
We call from a tuxedoservice a simple EJB on java side responding very fast (1ms).
We inject 40 simultaneous users on Tuxedo (there are 40instances of the tuxedoserver
making tpcalls to WTC-EJB). The tpcall of C side responds in about 700ms under
load and 50ms in standalone! We obtain about 20TPS (config: we have 100threads
on the default exec queue in WLS and kind of default configuration in Tuxedo;
Cpu utilisation during test is low: 55%).
Do you have any clues on improving TPS with WTC?
thx,
Mihai

Answer 1

Thanx FYI Scott.
In fact, mea culpa, I forgot to delete the traces from WTC which were at 10000
level. Even if there were no traces in the WLS log, deleting the line from startWebLogic.sh
has increase performance to 35TPS, with an average response time of about 30ms
for the tp (same config). This is OK, it-s a good performance level.
Tx,
Mihai
Scott Orshan <[email protected]> wrote:
You'll need to tell us a lot more about the application.
A 50 ms response time equates to 20 tps. It is 1/20 of a second. Is that
what you were trying to tell us? Your Tuxedo application does a tpcall
to an EJB, and that takes 1/20 of a second?
What buffer type and size are you sending? What is the EJB doing? If
it
is only doing CPU work on a 4 CPU machine, then you shouldn't have 100
execute threads. If Tuxedo is also running on the same machine, then
you
might only want a few execute threads, to leave some CPUs available to
run the Tuxedo side of the app.
Your low CPU utilization could be caused by lock synchronization in your
EJB. Do you use synchronized code or system methods?
Can you break out the CPU ussage by CPU? Vmstat will do that for you,
and you can see if some CPUs are at 100% while others are at zero. If
one of them is at 100%, the others might be waiting for that one to
finish what it is doing. You can get a thread dump from the JVM to see
what all of the threads are doing.
If you contact Support, they can collect all of the details of your
application and configuration.
     Scott Orshan
Mihai Voineag wrote:
We are testing a Tuxedo8.1 to Weblogic7sp1 link thru WTC, on a Sunfire6800,4procs-900mhz
machine.
We call from a tuxedoservice a simple EJB on java side responding veryfast (1ms).
We inject 40 simultaneous users on Tuxedo (there are 40instances ofthe tuxedoserver
making tpcalls to WTC-EJB). The tpcall of C side responds in about700ms under
load and 50ms in standalone! We obtain about 20TPS (config: we have100threads
on the default exec queue in WLS and kind of default configurationin Tuxedo;
Cpu utilisation during test is low: 55%).
Do you have any clues on improving TPS with WTC?
thx,
Mihai