data display interval is not as set and is not consistent in the plot

[shan-weiqiang]

Helllo, when using the monitor to display historic or real-time statistics, the time interval is not followed by the monitor: the data interval is not consistent, sometimes the interval can be very large, eg 2 min, even thought i set the time interval to 5s, please see the screenshot. Is it because the network or because of the monitor itself?

[jparisu]

Hi @shan-weiqiang

We need more information about your scenario in orther to help you:

• Data Topic using (I assume in your case it is FastDDS Latency)
• In historic plots -> number of bins and statistical function (e.g. AVG)
• In dynamic plots -> time interval and windows size
• Is your network stable? How fast is your connection and how many Participants do you have.

I suggest you to check our online documentation, specially the section of Data plots: https://fast-dds-monitor.readthedocs.io/en/latest/rst/user_manual/chart_panel_index.html

My notion with the information we have is that you are using RAW statistical kind and / or bins 0, so the points that are plotted do not follow a logical order, but are shown as they arrive from Fast DDS external Participants.