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<== Date ==> <== Thread ==>

Subject: Re: AlarmHandler as a daemon or service
From: Michael Borland <[email protected]>
To: "Ernest L. Williams Jr." <[email protected]>
Cc: EPICS tech-talk <[email protected]>, [email protected]
Date: Thu, 23 Mar 2006 23:18:26 -0600 (CST)
Ernest,

At APS we use alh for alarm handling (to alert operators to alarms and help them investigate alarms) and sddsalarmlog for alarm logging (for archival purposes and analysis). The text log files from alh are not that convenient for postprocessing and can get rather large (though this is not a big problem now as it was during commissioning). sddsalarmlog also optionally grabs the value of a related PV when the alarm goes off, which makes it easier to figure out what happened. Since the input files to sddsalarmlog are SDDS files, much of the maintenance is automated (e.g., when PV names change or PVs are deleted). Since sddsalarmlog is not dependent on a GUI, we start/restart it with a cron job so it is "guaranteed" to always be running.

We have a Tcl/Tk application that allows analysis of sddsalarmlog output, giving time histograms, alarm history, alarm counts per PV, alarm overlap analysis, status word decoding, etc.

--Michael

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On Thu, 23 Mar 2006, Ernest L. Williams Jr. wrote:

Hi everyone,

Two questions:

(1) How many sites used the EPICS AlarmHandler.

(2) Has anyone changed the EPICS AlarmHandler to run in daemon mode or
as a service?

This would be a useful mode when the logging option is used.

So, basically we would need a commandline option to enable this and give
us an alhLogger, ah?




Thanks, Ernest L. Williams Jr. SNS Control Systems Group ORNL



Replies:
Re: AlarmHandler as a daemon or service Ernest L. Williams Jr.
References:
AlarmHandler as a daemon or service Ernest L. Williams Jr.

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