Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 29 Jan 2014 16:08:25 -0600

Hi Murali,

On 01/29/2014 03:32 PM, Shankar, Murali wrote:
>    If I start up multiple IOC’s on the same linux server, the IOC’s that
> start up later use a dynamically assigned TCP port.
> 
>>>> cas warning: Configured TCP port was unavailable.
>>>> cas warning: Using dynamically assigned TCP port 33470,
> 
>   Just curious, is there an EPICS IOC shell command that prints
> out/displays this port?

I started to reply that you can see it in the output from 'casr 2' but
that gives the UDP port and any client-specific TCP ports, not the TCP
one that you want:

Starting iocInit
############################################################################
## EPICS R3.14.12.4-DEV $$Date$$
## EPICS Base built Jan  8 2014
############################################################################
cas warning: Configured TCP port was unavailable.
cas warning: Using dynamically assigned TCP port 37054,
cas warning: but now two or more servers share the same UDP port.
cas warning: Depending on your IP kernel this server may not be
cas warning: reachable with UDP unicast (a host's IP in EPICS_CA_ADDR_LIST)
iocRun: All initialization complete
epics> casr 2
Channel Access Server V4.13
Connected circuits:
TCP 164.54.9.24:50571(tux.aps.anl.gov): User="anj", V4.13, 1 Channels,
Priority=0
	Task Id=0x7f8cc0009830, Socket FD=7
	Secs since last send   3.37, Secs since last receive   3.37
	Unprocessed request bytes=0, Undelivered response bytes=0
	State=up
	656 bytes allocated
	anj2:exit(1rw)
UDP Server:
UDP 164.54.8.188:49991(): User="", V4.13, 0 Channels, Priority=0
	Task Id=0x7f8cc4000970, Socket FD=6
	Secs since last send   3.37, Secs since last receive   1.41
	Unprocessed request bytes=0, Undelivered response bytes=16
	State=up
	272 bytes allocated

There are currently 333208 bytes on the server's free list
6 client(s), 511 channel(s), 511 event(s) (monitors) 0 putNotify(s)
14 small buffers (16384 bytes ea), and 0 jumbo buffers (2500024 bytes ea)
The server's resource id conversion table:
Bucket entries in use = 1 bytes in use = 32832
Bucket entries/hash id - mean = 0.000244 std dev = 0.015623 max = 1
The server's array size limit is 2500024 bytes max
Channel Access Address List
164.54.11.255:5065

If you can connect to a PV on that server a CA client can see it, but
that's probably not much help to you:

tux% cainfo anj2:exit
anj2:exit
    State:            connected
    Host:             tux.aps.anl.gov:45089
    Access:           read, write
    Native data type: DBF_DOUBLE
    Request type:     DBR_DOUBLE
    Element count:    1

I think the answer is that there is no such command, although IMHO this
information should be available through casr.

- Andrew
-- 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System