Need help on Wrapper.log entries

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1

Hi all,
sometimes I find the following entries in my wrapper.log:

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image1803Ă—103 114 KB

and
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At the same time the Vision page objects shows the Uncertain overlay
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Is it a connectivity problem to the PLC? Pinging the PLC seems good when that happens - I'm running pinginfoview to record ping commands automatically

2

Are you having garbage collection stalls? I've seen such messages when a long GC stall causes some requests to time out the instant the stall is over, even though the reply was sent from the PLC (still in OS buffers, presumably).

3

Hi @pturmel and thanks. Garbage collection is working properly, if I look at the memory plot

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image615Ă—333 22.4 KB

Is that what you were meaning?

4

No, you need to enable GC logging so you can see how long your pause-the-world stalls are taking. Tens of milliseconds is fine. Maybe an occassional 100ms is fine. Any more than that and short request timeouts can start falling within the stall, and thereby expiring.

5

The first messages are indicating a request from an Igntion driver to some device timed out.

The second is from after an OPC UA client connection named “Ground” reconnected.

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6

Ok @Kevin.Herron , thanks. Running pinginfoview with a shorter ping period a found that you are right: there are some connection problems with the PLC. I'll ask the network admins.

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