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Subject: question about pvAccess/pvData, pvPut
From: Heinz Junkes via Tech-talk <tech-talk@aps.anl.gov>
To: tech-talk <tech-talk@aps.anl.gov>
Date: Wed, 22 May 2019 18:19:16 +0200
I have a data source (VMEbus-digitizer, RTEMS, EPICS 7) that sends 
with pvaPut Dataframes ( ~ 2 MByte )  about 1000 times/s  to a server which holds 
a Pv. 

PV-Structure:

structure
    structure value
        double[] column0
        double[] column1
        double[] column2
        double[] column3
    string[] labels
    string[] units
    string descriptor
    long counter
    structure[] attribute
        structure
            string name
            any value
            string descriptor
            int sourceType
            int source
    double[] digitizerTimeStamp
    structure timeStamp
        long secondsPastEpoch
        int nanoseconds
        int userTag
    structure alarm
        int severity
        int status
        string message


What is the proposed way to guarantee that the transmitter will get rid of its data within 1ms, regardless of how many monitors are attached to the PV?
And if possible also independent of the load of the server. Can this even be guaranteed with pvAccess? 
Are there such things like caches, pipelines etc.? Or do you have to implement it yourself?

Danke,
Heinz

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Re: question about pvAccess/pvData, pvPut Heinz Junkes via Tech-talk

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