EPICS Re: [CA][waveform]max array bytes on IOC

Experimental Physics and Industrial Control System

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

Subject:	Re: [CA][waveform]max array bytes on IOC
From:	"J. Lewis Muir" <[email protected]>
To:	Pavel Masloff <[email protected]>
Cc:	EPICS Tech Talk <[email protected]>
Date:	Fri, 18 May 2012 09:19:54 -0500

On 5/18/12 8:51 AM, Pavel Masloff wrote:
> It is very strange when I manually export the EPICS_CA_MAX_ARRAY_BYTES
> environmental variable on the IOC (export VAR=wahteverval), my waveforms on
> the client are connected.
> When I put this line to /root/.bashrc the client doesn't want to connect my
> waveform PVs....
> 
> What's wrong?

Hi, Pavel.

You need to set EPICS_CA_MAX_ARRAY_BYTES for both the CA server
and the client.  Did you do that?

Also, you're talking about setting EPICS_CA_MAX_ARRAY_BYTES in
/root/.bashrc.  Does that mean you're running the client as
root?  If yes, you need to ensure /root/.bashrc is being read by
bash.  Set EPICS_CA_MAX_ARRAY_BYTES in /root/.bashrc, start a
new shell in the way you normally would, and then execute the
following:

# echo $EPICS_CA_MAX_ARRAY_BYTES

Does that print what you expect?

If you're not running the client as root, then /root/.bashrc is
not the right place to set EPICS_CA_MAX_ARRAY_BYTES.  You either
need to do it for the user running the client, or you need to do
it in the system location (typically somewhere under /etc like
/etc/bashrc) for all users.

Also, for setting environment variables not specific to an
interactive shell, it's better to put that in the "profile" file
(e.g. ~/.bash_profile, ~/.profile, or /etc/profile) so that it's
available for non-interactive shells as well as interactive ones.

Lewis

References:: [CA][waveform]max array bytes on IOC Pavel Masloff

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