Experimental Physics and
Industrial Control System

Mark Boots <[email protected]> · Thu, 14 Oct 2010 14:20:24 -0600

Hi all,

We've noticed at the CLS that channel access puts (caput) from a default R3.14.11 build (linux-x86) to a 14.9 IOC are very slow.  As a test, we ran a shell script with ~100 caput (command line) calls; it took ~ 24 seconds to complete using the 14.11 version of caput, and only 6s for the 14.9 version.

Asynchronous caputs (using the channel access library, instead of the command line) seem to be even slower -- sometimes taking over a minute for the IOC to respond to all 100 puts.

We're still debugging to see if this is a peculiarity of the IOC.  I'm just wondering if anyone has seen similar issues involving channel access between different EPICS versions?  Any suggestions for tools or methods to help diagnose the problem?

Best regards,
-Mark

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Mark Boots

Dept. of Physics and Engineering Physics
University of Saskatchewan

Rm 202 Physics Building
116 Science Place, 
Saskatoon SK S7N 5E2
Canada

(306) 261-4162

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System