Experimental Physics and
Industrial Control System

Matthias Clausen <[email protected]> · Tue, 24 Jun 2008 11:02:11 +0200

Ernest Williams wrote:

Hi,
Has CA Put Logging been integrated into EPICS R3.14.x?

the hook for CA-Put-Logging are available in base for quite some time.
The hook for alarm-logging has been added recently.

Is it integrated into iocLog facility?

The hooks are only the mandatory part of this story.
The real workhorse is behind the hooks. (and not part of base)
So the answer is -no- it's not integrated into iocLog.
Behind the alarm-hook is the alarmLogging task which is now in operation
at DESY for about a year.

Behind the CA-PutLog hook is the task which Slava Korobov wrote about a
decade ago.

As soon as there's time to work on this part we (Bernd) will have a look
at the code for put-logging and use the same method as for alarmLogging
to forward(push) the putLog messages to the interconnectionServer which
finally writes messages into JMS. Besides the fact that we want to send
all of the messages: alarms, putLog AND system messages into JMS there's
another good reason to work on the putLogmessage task. Namely logging
changes when one - or even worse - two or more operators are tuning a
record using the slider. The actual implementation only covers the case
where lots of changes are applied to the same PV(as a result only one
message will be generated when the slider movement finished - here:
another PV is accessed, or after a tineout). We want to improve this
part of the code. The ring buffer which is already in place for
alarmLogging can help us (probably a second instance of it) to keep
track of bulk changes on several records in parallel.
If there's interest to work together on this part - let us know.
System logging shall finally also use the JMS message facility. The
advantage being that all messages will be stored in one place. All the
tools to display and analyze messages can be the same and last and most
importantly we can also use the support for redundant connections which
is built into the communication between IOC and interconnectionServer.
(btw: there's also a C++ program in operation to replace cmlogMsg and
write directly to JMS - on workstations)
-Matthias

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System