Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Tue, 12 Jan 2016 13:08:08 +0000

Either way should work.  If you run 3 devices in one IOC they will still use multiple threads/cores for some things, for example each asynSerialPort driver will run in its own thread.  There is no problem to run multiple IOCs on the same computer either.

Mark

________________________________________
From: [email protected] [[email protected]] on behalf of Christian Pauly [[email protected]]
Sent: Tuesday, January 12, 2016 6:45 AM
To: [email protected]
Subject: running multiple iocs on raspberry 2

Hi
I  am setting up a measuerement setup consisting of three individual
devices, which i would like to control with EPICS, running the IOC on a
Raspberry Pi. Communication with each of the devices is done using
altogether three USB-Serial converter, and based on StreamDevice.
I already have working IOCs for each individual device.

Now:
If i would like to run the full setup simultaneously:
Is it better to run the three IOCs individual on the Raspberry, one for
each device ? And relying on Linux for the Multitasking ?
Or is it preferable to run only a single IOC, and load the three
database .dbd files into the same IOC, Initializing all three Serial
ports in the same st.cmd startup file ???

The Raspberry2 has a quadcore CPU, so I could imagine, that running
three individual IOCs might give better performance, since three cores
are used ? But isn't there a problem to run more than one IOC in parallel ?

Any advice welcome !

Best regards.
Christian

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System