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<== Date ==> <== Thread ==>
Subject: Re: [EXTERNAL] Re: Question about compress records
From: "Guyotte, Greg via Tech-talk" <tech-talk at aps.anl.gov>
To: "Pearson, Matthew R." <pearsonmr at ornl.gov>, Ralph Lange <ralph.lange at gmx.de>
Cc: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Mon, 8 Feb 2021 18:46:23 +0000

I noticed that field also but couldn’t sort out how I can make use of it.  Thanks for the suggestion – it looks like it might work!

 

On 2/8/21, 1:45 PM, "Pearson, Matthew R." <pearsonmr at ornl.gov> wrote:



 

Hi Greg,

 

This might be a work around, until the feature is added to the compress record. You can copy the NUSE field and write it to the N field as the circular buffer fills up:

 

record(ai, "$(P)$(R)Test") {

  field(VAL, "0.0")

  field(FLNK, "$(P)$(R)Buffer")

}

record(compress, "$(P)$(R)Buffer") {

  field(INP, "$(P)$(R)Test")

  field(ALG, "Circular Buffer")

  field(NSAM, "10")

  field(FLNK, "$(P)$(R)AverageCalc")

}

record(longout, "$(P)$(R)AverageCalc") {

  field(OMSL, "closed_loop")

  field(DOL, "$(P)$(R)Buffer.NUSE")

  field(OUT, "$(P)$(R)Average.N")

  field(FLNK, "$(P)$(R)Average")

}

record(compress, "$(P)$(R)Average") {

  field(INP, "$(P)$(R)Buffer")

  field(ALG, "N to 1 Average")

}

 

 

Cheers,

Matt

 

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Guyotte, Greg via Tech-talk
Sent: Monday, February 8, 2021 1:37 PM
To: Ralph Lange <ralph.lange at gmx.de>; EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: Re: [EXTERNAL] Re: Question about compress records

 

That sounds correct to me Ralph.  I’m at least satisfied to know that the current operation is as expected.  I will try the solution suggested by Tim Mooney as well – thanks Tim.

 

On 2/8/21, 11:50 AM, "Tech-talk" <tech-talk-bounces at aps.anl.gov> wrote:

 

Hi Greg,

 

This behavior is (mostly) documented in the compress record reference manual entry.

 

Is it correct to write what you're missing as:

The compress record in its "N to 1 Xxx" modes, when reading an INP array that has less than NSAM * N elements (or while still filling its internal circular buffer), should use all existing elements of the INP array (or the internal buffer) and calculate as much of the resulting VAL array as possible, before firing VAL monitors and forward links.

 

Such a change should probably have a configuration switch, defaulting to the current behavior.

Sounds like a nice codeathon project!

 

Cheers,
~Ralph

 

References:
Question about compress records Guyotte, Greg via Tech-talk
Re: Question about compress records Ralph Lange via Tech-talk
Re: [EXTERNAL] Re: Question about compress records Guyotte, Greg via Tech-talk
RE: [EXTERNAL] Re: Question about compress records Pearson, Matthew R. via Tech-talk
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