Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: recDynLink.c and swait.c error messaged during ioc start
From:	Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
To:	"Gofron, Kazimierz" <kgofron at bnl.gov>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>, "mooney at anl.gov" <mooney at anl.gov>
Date:	Thu, 5 May 2022 15:40:10 +0000

Hi Kaz,

My previous message does not prove that I can modify recDynLinkQsize before iocInit, because I typed those commands after iocInit.

However, I just modified my st.cmd to change recDynLinkQsize just before iocInit, and it worked fine, no error message.

var recDynLinkQsize 1024

iocInit

Starting iocInit

Mark

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Thursday, May 5, 2022 10:34 AM
To: Gofron, Kazimierz <kgofron at bnl.gov>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; mooney at anl.gov <mooney at anl.gov>
Subject: Re: recDynLink.c and swait.c error messaged during ioc start

The recDynLinkQsize variable exists for me on my IOCs. This is the output of the "var" command:

epics> var

CASDEBUG = 0

PDBProviderDebug = 0

aCalcAsyncThreshold = 10000

aCalcLoopMax = 1000

aCalcMonitorMem_debug = 0

aCalcPerformDebug = 0

aCalcPostfixDebug = 0

aCalcoutRecordDebug = 0

aimDebug = 1

arrayTestDebug = 0

asCaDebug = 0

asCheckClientIP = 0

atExitDebug = 0

boHIGHlimit = 100000

boHIGHprecision = 2

calcoutODLYlimit = 100000

calcoutODLYprecision = 2

callbackParallelThreadsDefault = 20

configMenuDebug = 0

dbAccessDebugPUTF = 0

dbBptNotMonotonic = 0

dbConvertStrict = 0

dbJLinkDebug = 0

dbQuietMacroWarnings = 0

dbRecordsAbcSorted = 0

dbRecordsOnceOnly = 0

dbTemplateMaxVars = 100

dbThreadRealtimeLock = 1

debugSubAve = 0

debug_saveData = 0

debug_saveDataMsg = 0

devaCalcoutSoftDebug = 0

devsCalcoutSoftDebug = 0

drvMCDC2805debug = 0

drvPMNC87xxdebug = 0

eraseNDAttributes = 0

histogramSDELprecision = 2

icbDebug = 0

interpDebug = 0

lnkDebug_debug = 0

logClientDebug = 0

mcaRecordDebug = 0

pvHistoryDebug = 0

pvaLinkNWorkers = 1

recDigitelDebug = 0

recDynLinkDebug = 0

recDynLinkQsize = 256

sCalcLoopMax = 1000

sCalcPerformDebug = 0

sCalcPostfixDebug = 0

sCalcStackHW = 2

sCalcStackLW = 0

sCalcoutRecordDebug = 0

saveData_MessagePolicy = 0

save_restoreDatedBackupFiles = 1

save_restoreDebug = 0

save_restoreIncompleteSetsOk = 1

save_restoreNumSeqFiles = 3

save_restoreRemountThreshold = 10

save_restoreSeqPeriodInSeconds = 300

scalerRecordDebug = 0

scaler_wait_time = 10

scanparmRecordDebug = 0

seqDLYlimit = 100000

seqDLYprecision = 2

sscanRecordConnectWaitSeconds = 1

sscanRecordDebug = 0

sscanRecordDontCheckLimits = 0

sscanRecordLookupTime = 10

sscanRecordViewPos = 0

sseqRecDebug = 0

streamDebug = 0

streamError = 1

swaitRecordDebug = 0

tableRecordDebug = 0

transformRecordDebug = 0

I can change it:

epics> var recDynLinkQsize

recDynLinkQsize = 256

epics> var recDynLinkQsize 1024

epics> var recDynLinkQsize

recDynLinkQsize = 1024

Please send the output when you type the "var" command.

Mark

From: Gofron, Kazimierz <kgofron at bnl.gov>
Sent: Thursday, May 5, 2022 10:22 AM
To: Mark Rivers <rivers at cars.uchicago.edu>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; mooney at anl.gov <mooney at anl.gov>
Subject: Re: recDynLink.c and swait.c error messaged during ioc start

Hi Mark,

The variable "Var recDynLinkQsize not found." is not found during iocBoot

```

var recDynLinkQsize 1024

Var recDynLinkQsize not found.

iocInit()

```

Kaz,

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Thursday, May 5, 2022 10:37 AM
To: Gofron, Kazimierz <kgofron at bnl.gov>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; mooney at anl.gov <mooney at anl.gov>
Subject: Re: recDynLink.c and swait.c error messaged during ioc start

Hi Kaz,

recDynLinkQueueSize is a variable you can change from the IOC shell. So you can do this:

var recDynLinkQueueSize 1024

I think you probably need to do that before iocInit.

Mark

From: Gofron, Kazimierz <kgofron at bnl.gov>
Sent: Thursday, May 5, 2022 9:29 AM
To: Mark Rivers <rivers at cars.uchicago.edu>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; mooney at anl.gov <mooney at anl.gov>
Subject: Re: recDynLink.c and swait.c error messaged during ioc start

Hi Mark & Tim,

I added to st.cmd after envPaths, before iocInit:

```

errlogInit(20000)

callbackSetQueueSize(5000)

```

--------------------

Now there are only swaitRecord.c error messages:

```

epics> ioc_settings.sav: 1575 of 1575 PV's connected

filename="../swaitRecord.c" line number=870

recWait: rngBufGet error

filename="../swaitRecord.c" line number=872

recWait: rngBufGet error

```

These error messages stop after I start the feedback loop for the 1^st time

XF:10ID-CT{FbPid:06}PID:on -> On {XF:10ID-CT{FbPid:06}PID.FBON->On}

---------------------

@Tim

./sscan/sscanApp/src/recDynLink.c:int recDynLinkQsize = 256;

Are you suggesting to change it in sscan?

Or add recDynLinkQsize to the ioc, so it appears in

static struct iocshVarDef vardefs[] = {... }

Thank you

Kazimierz

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Wednesday, May 4, 2022 5:36 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; Gofron, Kazimierz <kgofron at bnl.gov>
Subject: Re: recDynLink.c and swait.c error messaged during ioc start

Hi Kaz,

> errlog: 34 messages were discarded

That error indicates that your message queue is overflowing, so you may be missing important messages. You should put this in st.cmd right after <envPaths

errlogInit(20000)

The error messages themselves might indicate that the callback queue not large enough. I would suggest adding this line before iocInit:

callbackSetQueueSize(5000)

See if adding those fixes the problem.

Mark

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Gofron, Kazimierz via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, May 4, 2022 4:09 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: recDynLink.c and swait.c error messaged during ioc start

Hi,

I've been working on EPICS pid ioc for temperature control, that uses Wiener power supply and Keithly 3706A PT1000 sensors scanner.

Recently we updated RHEL8.5 kernel, and I noticed that ioc shows errors since end of April 2022. Update might not be related to OS update. I might also be missing something in the dependency. Perhaps someone observed this before.

## EPICS R7.0.6
## Rev. R7.0.6

OS: RHEL8.5

During ioc startup, getting error messages from

sscan: / recDynLink.c : 549

    precDynLink->onQueue++;

    if (epicsMessageQueueTrySend(recDynLinkOutMsgQ, (void *)&cmd,
sizeof(cmd))) {
        errMessage(0,"recDynLinkPut: epicsMessageQueueTrySend error");
        status = RINGBUFF_PUT_ERROR;
        precDynLink->onQueue--;
    }

calc: / swait.c : 838/840

    recDynLinkGet(precDynLink, &monData, &nRequest,
0, 0,
0);     if (swaitRecordDebug>5)
        errlogPrintf("swaitRecord(%s)inputChanged: queuing monitor on
%d = 
%f\n",pwait->name,index,monData);
    if (epicsRingBytesPut(pcbst->monitorQ, (char *)&index,
sizeof(char))
        != sizeof(char))
errMessage(0,"recWait rngBufPut error");
    if (epicsRingBytesPut(pcbst->monitorQ, (char *)&monData,
sizeof(double))
        != sizeof(double))
errMessage(0,"recWait rngBufPut error");
    if (swaitRecordDebug>5) {
        errlogPrintf("swaitRecord(%s)inputChanged:
%d entries left in monitorQ\n",
pwait->name,
            (int)(epicsRingBytesFreeBytes(pcbst->monitorQ)/sizeof(struct qStruct)));
    }

calc: / swait.c: 870/872

    if (!swaitRecordCacheMode) {        if (epicsRingBytesGet(pcbst->monitorQ, (char *)&inputIndex,
sizeof(char))
            != sizeof(char))
errMessage(0,
"recWait: rngBufGet error");
        if (epicsRingBytesGet(pcbst->monitorQ, (char *)&monData,
sizeof(double))
            != sizeof(double))
errMessage(0,
"recWait: rngBufGet error");

=========================

epics> filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

filename="../recDynLink.c" line number=549

recDynLinkPut: epicsMessageQueueTrySend error

ioc_settings.sav: 1575 of 1575 PV's connected

errlog: 34 messages were discarded