Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 27 Nov 2012 14:24:51 -0600

Hi Jack,

On 2012-11-27 Jack Smith wrote:
> According to EPICS R3.14 Channel Access Reference Manual [1], I think
> caRepeater is only needed when multiple CA clients (CSS, EDM, etc.)
> run on the same host. Why should multiple IOC applications on the same
> Linux host be using caRepeater?

An IOC is a CA client as well as being a server: record links often point to 
records on other IOCs, the Access Security mechanism may subscribe to channels 
on other servers, and any sequence programs running in the IOC also use CA.  
The caRepeater is looked for and if necessary started at iocInit even if the 
CA client library never actually has to make any external connections because 
all of the PV names requested can be found locally within the IOC.

- Andrew
-- 
Computer science is as much about computers as astronomy is about
telescopes. -- Edsger Dijkstra

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System