Re: CS-Studio XY Graph problem with >2046 samples

["Kasemir, Kay via Tech-talk" <tech-talk at aps.anl.gov>]

You may run into the default setting for the EPICS_CA_MAX_ARRAY size of ~16k.

With “double” waveforms, 2046 samples * 8 bytes = 16k.

 

For phoebus the settings are described in https://control-system-studio.readthedocs.io/en/latest/preference_properties.html#pv-ca.

We set the default to  100000000, so that supports 2046 double samples.

For the Eclipse-based CSS, the way it’s configured has changed over time, you’ll have to see what applies to your version, to increase it from the default 16k.

 

-Kay

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Heesterman, Peter via Tech-talk <tech-talk at aps.anl.gov>
Date: Wednesday, November 8, 2023 at 9:51 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: [EXTERNAL] CS-Studio XY Graph problem with >2046 samples

Hi,

 

I’m using (Eclipse-based) CS-Studio 4.5.9 on Windows, and 4.8.1 within the ITER CS Red Hat installation.

 

I’m experiencing the same problem for both – when the number of samples in the waveform trace exceeds 2046, the OPI becomes very erratic and fails to display any further data.

Also, the IOC typically fails at the same time.

 

When this happens, CS-Studio repeatedly shows the error:

2023-11-08 14:01:51 ERROR: Error from pv connection layer:

java.lang.IllegalStateException: transport closed

 

If CS-Studio is not displaying the OPI, the IOC behaves perfectly for any number of samples.

 

I’ve also tested the behaviour when using Phoebus, instead of CS-Studio - both the OPI and the IOC then work perfectly.

 

Does anyone have suggestions as to how this problem might be resolved?

 

Many thanks,

 

Peter.

 

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