Re: Phoebus on ARM64

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

> Phoebus's Data Browser appears to be limited to just a few thousand historical points. 

See online help. Data Browser Live Data Sampling and Buffer Size:  https://control-system-studio.readthedocs.io/en/stable/app/databrowser/doc/index.html

Live Data Sampling

By default, traces will use a Scan Period of 0 seconds, which means we keep every sample received from the control system. To avoid running out of memory, the live data buffer has a limited Buffer Size. For example, if your channel updates every 1 second, and the buffer size is set to 5000, the data browser will keep roughly the last 1 hour and 20 minutes of live data in memory. Older samples are dropped.

To keep a longer time span of live data in memory, you can increase the Buffer Size, which obviously results in using more memory.

There’s a preference for the default buffer size: 

https://control-system-studio.readthedocs.io/en/stable/preference_properties.html#package-org.csstudio.trends.databrowser3

org.csstudio.trends.databrowser3/live_buffer_size

 = 5000