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:	"Gofron, Kazimierz via Tech-talk" <tech-talk at aps.anl.gov>
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>
Date:	Thu, 5 May 2022 14:29:05 +0000

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