Experimental Physics and
Industrial Control System

Luedeke Andreas <[email protected]> · Fri, 27 Jul 2007 11:44:26 +0200

Heinrich du Toit wrote:
Ok that's great, will look into it. :)
But what I need is more like a message log system.
The means like it can log 100 messages in a second if something happens
and then sit quite for 3 days.
That's why I was thinking to use the stringout record. Then my SNL

program can simply write to the stringout record and that will get

logged everytime. Or maybe this is not such a good idea?

Hello Heinrich,

you are right: it is not a good idea :-(

For strings and waveforms channel access just sends out the most recent
value.

If the value is changing faster than channel access can send out the
data, it is not cashed but overwritten.

See the details on tech-talk thread "soft IOC string and array records".
I think there are two application you could use:

- either CMLOG, which is not specialized on IOCs (and therefore maybe
oversized for you) or

- the "iocLogServer" facility, a central process to collect messages
from IOCs
iocLog allows you to send messages with errlogPrintf and they are
written to a file by the log server.

See IOC Application Developpers Guide: "IOC Error Logging".

The good thing: it is part of the EPICS base and you already have it
installed.

Just start an iocLogServer and tell your IOC to switch logging on.
Regards
Andreas
--
Dr. Andreas Luedeke, SLS Operations Manager, Tel:+41-56-3104002
[email protected], http://people.web.psi.ch/luedeke

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System