Experimental Physics and
Industrial Control System

"Brian McAllister" <[email protected]> · Wed, 30 Jun 1999 16:52:28 -0400

> here another question. I am trying to use the archiver for EPICS, but
> there are several problems
> If I am using the snapshot mode, it could miss some things happened in
> between. If I use the monitor mode, it crashed when it reaches the file
> size that I specified.

It doesn't crash, it aborts intentionally (due to failure of an "assert()"
test on the success of a write to the file).

Not very friendly behavior, especially if you have more than one request
open, as it won't properly flush and close the others before exiting.

> And it gets tothat file size too fast. $ variables only take 3 hours to
> reach 1Mbytes.

The maximum file size allowed by AR seems to be 100 Mbytes.  This is set in
the OUTPUT line in the request file.

Also, look carefully at the data you are archiving.  It may be possible to
reduce the data rate by increasing deadbands (.ADEL) or using smoothing in
your database.

----
Brian McAllister                 Application Programmer/Beam Physicist
[email protected]                        MIT-Bates Linear Accelerator

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System