MySamplerStream slow on busy channels

Created by: apcarp

The MySamplerStream is very slow on busy channels when compared to the command line application. This is because jmyapi takes the approach of streaming all data through the application where it is sampled instead of repeatedly querying the database for each sample point. Streaming is much faster for channels that have slower update rates, but repeated queries are faster if the channel has lots of updates per sample.

ILM1A04Lc is an example of a very busy channel. It updates around 10 Hz.

For more details see https://github.com/JeffersonLab/myquery/issues/19.