[Dsg-hallb_magnets] Results of Fast-DAQ time gap investigation

[Glenn Young]

very nice diagnostics


On 1/31/2017 11:55 AM, Tyler Lemon wrote:
> Hello,
>
> The results of my investigation of the time gaps are as follows:
>
>  1. Fast-DAQ data is sent at 10kHz to EPICS (2000 samples every 5Hz).
>  2. There are no time gaps in data from FPGA seen in LabVIEW.
>  3. There are no time gaps in LabVIEW before data is sent to EPICS.
>  4. There are no time gaps in data when viewing shared variables used
>     to send data to EPICS.
>  5. There are no time gaps in data on EPICS Live Fast-DAQ screen.
>  6. There are time gaps in data recorded by EPICS.
>  7. There were no time gaps in recorded data when data was sent to
>     EPICS at rate of 1Hz.
>  8. Time gaps first appeared after upping data rate to EPICS to 5Hz.
>  9. There have been no changes to how LabVIEW processes Fast-DAQ data
>     besides increasing the EPICS data rate to 1Hz to 5Hz.
>
> Because of these findings, the time gaps are most likely caused by the 
> write speed to disk for the EPICS data logging. The cRIO and LabVIEW 
> would not have any affect on the time gaps seen.
>
> Best regards,
> Tyler
>
>
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