Experimental Physics and Industrial Control System
Title: Message
I am getting some
strange behaviour when writing enumerations through the Gateway (version 2.0.0.0
on 3.14.8.2 and RedHat Enterprise 4).
The problem first
showed itself in edm when pressing a button on a edm screen to send the value
resulted in the following error:
CA.Client.Exception...............................................
Warning: "Virtual circuit
unresponsive"
Context:
"diamrs0005l.diamond.ac.uk:6064"
Source File: ../tcpiiu.cpp
line 896
Current Time: Tue Mar 28 2006
16:19:01.334736000
..................................................................
I did some further
tests using caput with similar results:
[pjl45@pc0005 pjl45]$ caput -w15 GDA:scaler2.CNT
Count
Old :
GDA:scaler2.CNT
Done
Read operation timed out: PV data was not
read.
New : GDA:scaler2.CNT
CA.Client.Exception...............................................
Warning: "Virtual circuit
disconnect"
Context: "op=0,
channel=GDA:scaler2.CNT, type=DBR_TIME_STRING, count=1,
ctx="diamrs0005l.diamond.ac.uk:6064""
Source File: ../getCopy.cpp line
82
Current Time: Tue Mar 28 2006
17:04:24.488496000
.
Despite the above
error message the write does actually reach the IOC.
However if I
now try the change the value back as follows:
[pjl45@pc0005 pjl45]$
caput -w15 GDA:scaler2.CNT Done
Old :
GDA:scaler2.CNT
Count
Read operation
timed out: PV data was not read.
New :
GDA:scaler2.CNT
CA.Client.Exception...............................................
Warning: "Virtual circuit
disconnect"
Context: "op=0,
channel=GDA:scaler2.CNT, type=DBR_TIME_STRING, count=1,
ctx="diamrs0005l.diamond.ac.uk:6064""
Source File: ../getCopy.cpp
line 82
Current Time: Tue Mar 28 2006
17:22:36.167980000
..................................................................
I get an error again
however this time the 'Done' value gets written to the IOC
exactly ONE MINUTE after I entered the caput command. This is long
after the caput command has timed out so it appears the gateway is responsible
for the delay?
Has anyone any idea
what may be happening? Is there a 60 second timeout in CA or the gateway which
may give a clue as to what I am seeing?
(For the record this
test was done with a very lightly loaded test gateway serving only 20 or
so PV's. Also using caput -w70 results in the same
timeouts)
Pete Leicester
Senior Software Engineer
Diamond Light Source Ltd.
Rutherford Appleton
Laboratory
Chilton
Didcot
OX11 0QX
Tel: 01235 778478
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