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https://issues.apache.org/jira/browse/PLC4X-279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17276658#comment-17276658
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Stefano Bossi commented on PLC4X-279:
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I really think these two issue has the same root cause.
Regards,
S.
> nioEventLoopGroup thread proliferation
> --------------------------------------
>
> Key: PLC4X-279
> URL: https://issues.apache.org/jira/browse/PLC4X-279
> Project: Apache PLC4X
> Issue Type: Bug
> Components: Driver-S7
> Affects Versions: 0.8.0
> Reporter: Stefano Bossi
> Priority: Major
> Attachments: Screenshot 2021-02-01 at 09.19.07.png, Screenshot
> 2021-02-01 at 09.20.42.png, Screenshot 2021-02-01 at 20.20.08.png, Screenshot
> 2021-02-01 at 20.20.08.png, Screenshot 2021-02-01 at 20.20.08.png, Screenshot
> 2021-02-01 at 21.57.50.png, Screenshot 2021-02-01 at 21.57.50.png, Threads
> total 2021-01-31 at 11.34.15.png, Threads total 2021-02-01 at 09.14.02.png
>
>
> Dear developers,
> I did a stability test with the plc4x 0.8.0 and pool2 library.
> The test is just reading continuously a couple of DataBlock from a S7 Siemens
> 1200 PLC.
> During the test I have used VisualVM like profiler to inspect the use of the
> Heap and the threads and I found something strange.
> The test runs for a couple of days and I have sampled the threads in a couple
> of snapshot found that the number of running nioEventLoopGroup thread
> increase and doesn't seems to be bounded by a limit.
> These are the total of the Threads of the applications at 2021-01-31 at
> 11.34.15; the total number is 246 and the number of nioEventLoopGroup is 192
> !Threads total 2021-01-31 at 11.34.15.png|width=568,height=332!
> These are the total of the Threads of the applications at 2021-02-01 at
> 09.14.02; the total number is 358 and the number of nioEventLoopGroup is 305
> !Threads total 2021-02-01 at 09.14.02.png|width=549,height=309!
> Form the profiler two of this thread are:
> !Screenshot 2021-02-01 at 09.19.07.png|width=530,height=210!
> !Screenshot 2021-02-01 at 09.20.42.png|width=539,height=271!
>
> It seems a leakage and seems a dangerous one.
> I think the problem is inside the pool2 library but I am note sure.
> What do you think?
> Regards,
> S.
>
>
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