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Subject: Re: gateway enum writes
From: Tim Mooney <[email protected]>
To: "Leicester, PJ (Pete)" <[email protected]>
Cc: [email protected]
Date: Tue, 28 Mar 2006 14:06:32 -0600
Leicester, PJ (Pete) wrote:
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)

Do you get this kind of result with *all* enum fields that you write to through the gateway, or only this one? The scaler record's CNT field is different from other enum's in that it starts an operation that may take a long time to complete. I don't know what the gateway is using to do put's, but if it should happen to be ca_put_callback(), the gateway may be waiting for a callback that will come only after the scaler has finished counting.

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab


References:
gateway enum writes Leicester, PJ (Pete)

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