Questions about ejb waitTime statistic

[omas...@gmail.com]

I have some questions about the ejb waitTime statistic :

https://docs.wildfly.org/26/wildscribe/deployment/subsystem/ejb3/stateless-session-bean/index.html#attr-wait-time

1) I guess the time is in milliseconds and it is a total wait time right ?

2) What could explain that the waitTime is way higher than 0 when peakConcurrentInvocations is way below the poolMaxSize ?

Here is an example:

executionTime : 2702304

invocations : 1657621

peakConcurrentInvocations : 3

poolAvailableCount : 500

poolCreateCount : 3

poolCurrentSize : 3

poolMaxSize : 500

poolName : slsb-strict-max-pool

waitTime : 26617

As you can see the waitTime is quite high (26 seconds) while only having 3 concurrent invocations which is way under the poolMaxSize.

If I divide 'invocations' by 'waitTime' is gives me an average of 62ms which seems quite high to me.

What is exactly included in the computing of the waitTime, so that I could understand where this total of 26s comes from ?

Thanks a lot.

[Cheng Fang]

On Feb 7, 2023, at 5:09 AM, omas...@gmail.com <omas...@gmail.com> wrote:

I have some questions about the ejb waitTime statistic :

https://docs.wildfly.org/26/wildscribe/deployment/subsystem/ejb3/stateless-session-bean/index.html#attr-wait-time

1) I guess the time is in milliseconds and it is a total wait time right ?

Yes.

2) What could explain that the waitTime is way higher than 0 when peakConcurrentInvocations is way below the poolMaxSize ?

To calculate the average wait-time per invocation for this slsb: 

waitTime : 26617 / invocations : 1657621 = 0.0160573496595422 millis per invocation

which is passable.

Only 3 threads are created so far, though the configured max thread pool size is 500, since 3 threads already suffice to handle all invocations.

Here is an example:

executionTime : 2702304

invocations : 1657621

peakConcurrentInvocations : 3

poolAvailableCount : 500

poolCreateCount : 3

poolCurrentSize : 3

poolMaxSize : 500

poolName : slsb-strict-max-pool

waitTime : 26617

As you can see the waitTime is quite high (26 seconds) while only having 3 concurrent invocations which is way under the poolMaxSize.

If I divide 'invocations' by 'waitTime' is gives me an average of 62ms which seems quite high to me.

What is exactly included in the computing of the waitTime, so that I could understand where this total of 26s comes from ?

Thanks a lot.

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[omas...@gmail.com]

Thanks for your answer.

My bad, I indeed flipped the numbers by dividing invocations by waitTime instead of dividing waitTime by invocations.

I should have seen it when reviewing my questions. It suddenly makes more sense when doing the math correctly.

I guess I need more sleep :)

[Suresh G]

Dear All,

Even though i give 10 or 500 or 1000 concurrent request via Jmeter below always stays in 10. Is there any config to be considered?

poolCreateCount : 10

poolCurrentSize : 10

Thanks  

[Cheng Fang]

Did you configure both /subsystem=ejb3/strict-max-bean-instance-pool=slsb-strict-max-pool and /subsystem=ejb3/thread-pool=default to suitable values?

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