RE: PV Update performance

["Dalesio, Leo" <dalesio@bnl.gov>]

What is the composition of the record types??

Is this just record processing that you are measuring or do you have Channel Access Monitors?

Are the records linked with INP, FLNK firelds or are these reading hardware?

What kind of hardware are you reading?

Are these numbers just the record processing?

What kind of hardware are you reading?

Why 120 Hz - what are you trying to accomplish at that rate?

For just record processing, each section of code only gets executed if it is needed - are you checking alarms? do you have monitors set? 

If you are linking records, it is higher performance to use INP and OUT links with PP set than it is to use an FLNK and then an INP link. 

Until the problem is clear, it is unclear what can be done.

Bob

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From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of 김영욱 [robotix@mobiis.com]
Sent: Tuesday, November 11, 2014 2:14 AM
To: tech-talk
Subject: PV Update performance

Hello all,

 

i'm working lately on an EPICS machine, where the number of PVs is 470 at the moment and they need to be updated regularly at 60Hz. The EPICS machine consists of the stuffs as:

 

. VME6100 (Mototorla VME CPU @1.25GHz)

. RTEMS

. EPICS (base-R3-14-12)

 

Currently all these updates for the 470 PVs is taken about 2-3.5 msec; which needs to be improved in a great manner for my 'real' project with about 23,980 PVs, to be updated regularly at 120Hz, after all.

 

Is here anyone who can give me some advice on this 'huge' improvement i need?

 

Best Regards

Young-Wuk KIM