Tuning the good number of thread with Work Manager?

Hi,
I search some best practice or experience return on the max thread number on a weblogic managed server
I try to explain: with WLS 8.1 and execute queue it was hard to tune the good number of thread but possible (with some processor and for an application we find that after 30 concurrent thread, there's lower performance because of switch on processeur, for others it was 45 for example)
Now i can see sometimes more than 500 thread on one JVM and it seem to be very much for me!!
we face some problem of response time in PRODUCTION, i can see sometimes more than 100 Stuck thread on a resource, so i think it's the reason of bad response time. But with Work Manager, it increase the number of thread to accept others request and the CPU stay at acceptable level (less than 50%) because the stuckthread are do nothing (waiting for resource)
So i don't understand the good tuning to apply since WorkManager...ok it isn't normal to have a lot of stuck thread but if there's no matter about the max number of thread, is it useful to stop and restart managed server?
do you think we can have have bad performance if there's a lot of thread?
thank you for your experience return. If you have no idea just tell me how much thread you can see on your managed server in Production.

up, up...
we have always the same probleme in production: 50 stuck thread on each JVM since 15 days....
the manages serveurs are in warning but don't seem to be disturb cause the work manager add more threads dynamicaly.
Anyone have idea if this situation is a probleme for response time on other request ?
reboot managed solve this situation but i would like to understand the consequence of this situation.
thanks a lot for your experience.

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Tuning the good number of thread with Work Manager?

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