Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Thu, 5 Jun 2014 13:56:06 -0700

I’m not sure that this is a good idea.  Having different clients behave differently seems like it’s going to cause a lot more problems than it solves.

On Jun 5, 2014, at 11:40 AM, Hu, Yong <[email protected]> wrote:

> Hello All,
> 
> I guess many EPICS users, especially beginners, had problems when using the command "caget" to read large waveform data because they forgot to reconfigure EPICS_CA_MAX_ARRAY_BYTES to a bigger number or they didn't know how to configure this parameter. Now, this problem seems to be fixed. See attached patch or .c file. I tested it on Debian 6 / gcc 4.4.5 / base-3.14.12.2.
> 
> I hope no users would use the command "camonitor" for big waveform data. Auto-configuring of EPICS_CA_MAX_ARRAY_BYTES in camonitor seems more complicated.  
> 
> Two years ago, there were discussions about automatically resizing max_array_bytes: http://www.aps.anl.gov/epics/tech-talk/2012/msg02136.php . I have an idea about how to implement this on the ioc side (RSRV), but no progress has been made yet. We just successfully completed NSLS-II Storage Ring phase-I commissioning and our machine is in maintenance. So, I have some free time to work on this again.   
> 
> All are welcomed to test the attached caget on Windows, Mac, and other Linux distros. Any idea & suggestion is welcomed!
> 
> Yong<caget.c-3.14.12.2.patch><caget.c>

-- 
Eric Norum
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System