RE: record processing time

[Mark Rivers <rivers@cars.uchicago.edu>]

Hi Vishnu,

 

Please tell us about your output records, TEST:OUT0-O, etc.  Are they connected to hardware?  If so, is the device support synchronous or asynchronous, and what driver are you using?  If they are connected to hardware and the device support is synchronous, then 50 microseconds may just be the time it takes the driver to do the I/O.  If the records are not connected to hardware then how did you measure the 50 microseconds?

 

Mark

 

 

From: vishnu.patel@rediffmail.com [mailto:vishnu.patel@rediffmail.com]
Sent: Friday, February 14, 2014 8:37 AM
To: Mark Rivers
Cc: techtalk
Subject: Re: record processing time

 

Hi,

   In my application i am putting value on 4 output port lines simultaneously with dfanout record.   

record (dfanout,"TEST:EVENT1-FOUT")

{

        field(DESC, "stop all event simaltanously")

        field(DOL, "TEST:WAIT-EVENT")

        field(HOPR, "1")

        field(LOPR, "0")

        field(OMSL, "closed_loop")

        field(OUTA, "TEST:OUT0-O PP")

        field(OUTB, "TEST:OUT1-O PP")

        field(OUTC, "TEST:OUT2-O PP")

        field(OUTD, "TEST:OUT3-O PP")

}

 

 

 

  "TEST:OUT0-O,    TEST:OUT1-O,   TEST:OUT2-O, and TEST:OUT3-O  are 4 output record putting the values on output port lines. 

 

The TEST:WAIT-EVENT is the taking value from User interface. 0 or 1.

 

 

I observed the delay between each output is approximately 50 micro second. so total delay from first to last PV is ~200 micro second.

The OS running the IOC is RHEL.

 

 

I would like to know this delay time is normal in EPICS or i can even get better with some mechanism. 

 

 

Thank you

 

From: Mark Rivers <rivers@cars.uchicago.edu>
Sent: Wed, 12 Feb 2014 20:39:16
To: Vishnu Patel <vishnu.patel@rediffmail.com>, "techtalk " <tech-talk@aps.anl.gov>
Subject: Re: record processing time
The processing time depends of course on the record type and the CPU you are using.  But it is typically on the order of a few microseconds.
________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Vishnu Patel [vishnu.patel@rediffmail.com]
Sent: Wednesday, February 12, 2014 8:16 AM
To: techtalk
Subject: record processing time

Hi,
  I would like to know about time required for record processing.
In my application
When PV1 becomes 1  (scan I/O Intr.),  process waveform record with FLNK and  then first element value of waveform record is placed in PVx and second element value of waveform record is put in PVy with subArray record.

I would like to know, what is the process time of EPICS record processing?

Thank you

Vishnu



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