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Subject: subArray record [SEC=UNOFFICIAL]
From: "STARRITT, Andrew via Tech-talk" <tech-talk@aps.anl.gov>
To: "EPICS Tech Talk (tech-talk@aps.anl.gov)" <tech-talk@aps.anl.gov>
Date: Tue, 24 Dec 2019 01:13:12 +0000

Happy Christmas Tech-Talkers,

 

The following is an extract from one of my IOCs.

 

record (waveform, "SR07BM01FPM01:FILL_PATTERN_ABS_WAVEFORM") {

    field (DESC, "FPM Abs Data")

    field (SCAN, "Passive")

    field (NELM, "360")

    field (FTVL, "DOUBLE")

    field (PREC, "5")

}

...

record (subArray, "SR07BM01FPM01:FILL_PATTERN_ELEMENT_030_EXTRACT") {

    field (DESC, "Extract element 30")

    field (SCAN, "Passive")

    field (INP,  "SR07BM01FPM01:FILL_PATTERN_ABS_WAVEFORM CP")

    field (FTVL, "DOUBLE")

    field (MALM, "360")

    field (NELM, "1")

    field (INDX, "$(I)")

}

 

Using base-3-15-6, running cainfo SR07BM01FPM01:FILL_PATTERN_ELEMENT_030_EXTRACT

 

yields

 

SR07BM01FPM01:FILL_PATTERN_ELEMENT_030_EXTRACT

    State:            connected

    Host:             CR01GW17-CTL:5064

    Access:           read, no write

    Native data type: DBF_DOUBLE

    Request type:     DBR_DOUBLE

    Element count:    360

 

However, previously with an IOC using 3.14.8.4 this yielded a single valued PV.

We only noticed this when examining the Archive Appliance statistics (which PVs are

archiving the most data)

 

The subArrayRecord.c cvt_dbaddr function has changed from

 

   if (!psa->udf && psa->nelm > psa->nord)

      paddr->no_elements = psa->nord;

   else

      paddr->no_elements = psa->nelm;

 

to

 

   paddr->no_elements = prec->malm;

 

My questions: Is this a bug or a feature?

 

Cheers

 

Andrew

 

Andrew C Starritt

Manager - Accelerator Controls and Support Systems
Australian Synchrotron

Tel
Email
Web

+61 3 8540 4164
andrews@ansto.gov.au
www.ansto.gov.au

   


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Replies:
Re: subArray record [SEC=UNOFFICIAL] Michael Davidsaver via Tech-talk
Re: subArray record [SEC=UNOFFICIAL] Johnson, Andrew N. via Tech-talk

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