Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Thu, 21 Aug 2008 10:07:56 +0200

Hi,
I have a gateway which gives read-only access from the office to the machine.
There I have seen serverEventRate=861 and serverPostRate=5646, a factor of 6.5!
(cpuFract=0.0).
I have not seen any problems with that. Maybe some monitor events get lost, but
they are not guaranteed to get through anyway. If a channel changes often in a
burst, only the first and the last change is "guaranteed" to arrive at the
client. That is enough to see when something starts changing and to have the
correct value when the burst is over.
Dirk
Kevin Tsubota wrote:

Hi,

I’m working on deployment of an EPICS Gateway version 2.0.3.0 in our
system here. I have the gateway running on a solaris-8 computer built
against EPICS R3.14.9 with gcc 3.3.6. The gateway is serving 2 VxWorks
IOCs on a separate VLAN running EPICS R3.13.10 and VxWorkd 5.3.1.
According to the following description for serverPostRate:
 This is the rate in Hz at which events are posted to CAS. If the

Gateway is keeping up, this will be very close to the serverEventRate.
If not, it will be higher and all posted events will not have been
processed.
It’s not good when the serverPostRate is higher than the
serverEventRate. When I look my gateway stats I see that my
servoPostRate is a lot higher than my serverEventRate, sometimes by as
much as 2x, see attached gateway_rates.pdf. The data was logged once
every 10sec. My load and cpu frac seems okay, see attached
gateway_load.pdf.

Is there a way see what’s causing this and what can I do about it?

Thank you in advance.

Kevin Tsubota
W.M. Keck Observatory

--
Dr. Dirk Zimoch
Paul Scherrer Institut, WBGB/006
5232 Villigen PSI, Switzerland
Phone +41 56 310 5182

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System