[PLC4X-279] nioEventLoopGroup thread proliferation

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.9.0
• Component/s: Driver-S7
• Assignee: Unassigned
• Reporter: Stefano Bossi
• Created: 01/Feb/21 10:55
• Updated: 03/Feb/21 09:14
• Resolved: 03/Feb/21 09:14

Description

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

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

 Form the profiler two of this thread are:

 

 

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.

 

 

Issue Links

• is related to: PLC4X-278 Double Reading Error