Re: dm and edm problems with CA gateway

[Rolf Keitel <rolf@triumf.ca>]

Hi Ken,

Kenneth Evans, Jr. wrote:

> Rolf,
>
> We have not seen such problems at the APS to my knowledge.  Our main Gateway
> is Linux, has been running as Linux for over a year, and runs at around
> 20,000 PVs and 2000 - 4000 events per sec.  That is, it is heavily used, so
> one would expect to have seen this problem if it is a Gateway problem.  We
> have on the order of 40 other Gateways, mostly Solaris, running several
> Gateway versions.  We, of course, use MEDM.
>
> Gateway Beta18 has not been run with 3.14.6 here, only with 3.14.7.  Do you
> have any information as to whether this happens with other Gateway versions
> running with 3.14.6.
>  
we tested this with gateway 2.0.0.0Beta12 and 2.0.0.0Beta18, both on 
Epics 3.14.6

> You also did not say if the problem is reproducible or random.  Identifying
> a reproducible situation would be helpful.
>  
It does not happen every time you move the slider, but we can usually 
reproduce it within 5 to 10 seconds by moving a slider a short bit, then 
release, move again, release.etc.
Note that our sliders are set to "send on motion" as our operators have 
to see value changes while they are moving the slider.

- rolf -

> If you can work on it yourself, you can start a Gateway on a machine or port
> that is not used (to keep the number of events low).  You can then set
> breakpoints in the debugger and see when these values get big.  You can do
> the same with EDM.  At this point we do not know if EDM is sending the wrong
> values or if the Gateway is manufacturing them.
>
> It could even be the IOC.  Is this happening with just one IOC and PV or
> happening more universally.  Does it happen with some PVs and not others.
> Etc.
>
> If you need help in where to set breakpoints or the like, let me know.
> There is not much else I can do from here.
>
> 	-Ken
>
>  


--
+-------------------------------------------------+
| Rolf Keitel, TRIUMF         Tel: (604) 222-7453 |
| Group Leader ISAC Controls  Fax: (604) 222-7307 |
| and Electronics Development                     |
| Vancouver, B.C., Canada                         |
+-------------------------------------------------+