Re: Tech-talk Digest, Vol 16, Issue 712

[William F Badgett Jr via Tech-talk <tech-talk@aps.anl.gov>]

I will reply to my own message from Dec 12, 2022:  The CentOS 9 server was converted to AlmaLinux 9, and the alarm-server now works fine.  I have no theory how/why a Java application would care about this...

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From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of tech-talk-request@aps.anl.gov <tech-talk-request@aps.anl.gov>
Sent: Monday, December 12, 2022 4:34 PM
To: tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: Tech-talk Digest, Vol 16, Issue 712

 

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Today's Topics:

   1. Phoebus Alarm Server on CentOS 9?  (William F Badgett Jr)
   2. Re: Ways to know if instrument connected via TCP/IP through
      StreamDevice has lost connection (Wang, Andrew)
   3. Checking CPU and memory usage for an IOC (Wang, Andrew)
   4. Re: Checking CPU and memory usage for an IOC (Simon Rose)


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Message: 1
Date: Mon, 12 Dec 2022 20:45:57 +0000
From: William F Badgett Jr <badgett@fnal.gov>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Subject: Phoebus Alarm Server on CentOS 9?
Message-ID:
        <DM6PR09MB5607749F6E24E2C4DC56D20ACAE29@DM6PR09MB5607.namprd09.prod.outlook.com>
       
Content-Type: text/plain; charset="iso-8859-1"

I'm trying to get the Phoebus alarm-server to run on CentOS 9 here, and it launches, connects to Kafka OK, but it cannot "see" the EPICS channel access PVs.   From the command line before launching alarm-server, I can "caget" the variables, but in alarm-server it shows "disconnected"

Java 13, CentOS 9 5.14.0-183.el9.x86_64

The alarm-server works fine on SL7 servers and can "see" EPICS IOCs

Ideas?

William Badgett
Accelerator Division Controls
Neutrino Division Operations
Fermi National Accelerator Lab
Kirk and Wilson Roads
BTE-214 Booster Tower East Room 214
Batavia, IL 60510 U.S.A.
badgett@fnal.gov

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Message: 2
Date: Mon, 12 Dec 2022 22:11:28 +0000
From: "Wang, Andrew" <wang126@llnl.gov>
To: Mark Rivers <rivers@cars.uchicago.edu>, EPICS tech-talk
        <tech-talk@aps.anl.gov>
Subject: Re: Ways to know if instrument connected via TCP/IP through
        StreamDevice has lost connection
Message-ID:
        <BY3PR09MB81945E11CD3D0BCAEAD923D282E29@BY3PR09MB8194.namprd09.prod.outlook.com>
       
Content-Type: text/plain; charset="us-ascii"

Mark,

This is extremely helpful. I will let you know if I have follow up questions.

Andy
________________________________
From: Mark Rivers <rivers@cars.uchicago.edu>
Sent: Thursday, December 8, 2022 6:51 PM
To: EPICS tech-talk <tech-talk@aps.anl.gov>; Wang, Andrew <wang126@llnl.gov>
Subject: Re: Ways to know if instrument connected via TCP/IP through StreamDevice has lost connection

Hi Andy,

> I feel like there is a better way than me trying to use a calcout record and check if any record has its STAT field set to COMM. Like, is it possible to monitor for connection status without needing to process a record whose device type is StreamDevice and check its STAT field?

Yes, there is a better way.

First, you probably want to use this line in your startup script:

asynSetOption("$(PORT)",0, "disconnectOnReadTimeout", "Y")

That will cause the port to disconnect if there is a timeout.  If you don't do that then the asyn won't know that the port is disconnected for a very long time on Linux, it will just keep giving "temporarily unavailable" messages.

In your startup script load an asyn record that is connected to that asyn port.  Here is an example:

dbLoadRecords("$(ASYN)/db/asynRecord.db", "P=IOC:, R=asyn1, PORT=ARIES1, ADDR=0, OMAX=256, IMAX=256")

You can monitor the  IOC:asyn1.CNCT field,  which will either be "Connect" or "Disconnect".

Mark


________________________________
From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Wang, Andrew via Tech-talk <tech-talk@aps.anl.gov>
Sent: Thursday, December 8, 2022 8:21 PM
To: EPICS tech-talk <tech-talk@aps.anl.gov>
Subject: Ways to know if instrument connected via TCP/IP through StreamDevice has lost connection

Hi all,

Basically, I was wondering if there is a better way to know if communication to an instrument has been lost. I understand that this can be done either by simplying looking at the IOC shell for disconnection errors or checking if the STAT field is set to COMM.

I was wondering if there is another method of determining if the instrument is still connected or not besides the two methods described above. Additionally, I would like to have a record called "is_instrument_connected", that holds a value like 1 to indicate the instrument is connected and a 0 if it is not. I feel like there is a better way than me trying to use a calcout record and check if any record has its STAT field set to COMM. Like, is it possible to monitor for connection status without needing to process a record whose device type is StreamDevice and check its STAT field?

Thank you,
Andy
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Message: 3
Date: Mon, 12 Dec 2022 22:13:29 +0000
From: "Wang, Andrew" <wang126@llnl.gov>
To: EPICS tech-talk <tech-talk@aps.anl.gov>
Subject: Checking CPU and memory usage for an IOC
Message-ID:
        <BY3PR09MB819412B9EC493B3E541D5D3582E29@BY3PR09MB8194.namprd09.prod.outlook.com>
       
Content-Type: text/plain; charset="iso-8859-1"

All,

This is a very general question, but I was curious if people here have been able to monitor CPU and memory usage of a particular IOC as it ran. If so, what was the approach you took to do so?

Thank you,
Andy
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Message: 4
Date: Mon, 12 Dec 2022 22:34:06 +0000
From: Simon Rose <Simon.Rose@ess.eu>
To: "Wang, Andrew" <wang126@llnl.gov>, EPICS tech-talk
        <tech-talk@aps.anl.gov>
Subject: Re: Checking CPU and memory usage for an IOC
Message-ID: <45E594FF-D6DE-4272-9D0A-7CF7431986E4@ess.eu>
Content-Type: text/plain; charset="utf-8"

Hi Andy ?

There is the iocStats module that might do what you are looking for: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_epics-2Dmodules_iocStats&d=DwICAg&c=gRgGjJ3BkIsb5y6s49QqsA&r=rFOy-ydFEnpKcV3qYX1tt7JonnG1Pzrsmr398l7QSm4&m=uCbIidZWhQIOD-BoyeOvNjOU1mpW0410IHM8JGvBYDCKytPy0zF2Cpn7knZKU_zb&s=MYLwjAZ7todFqhQxET171vSWJu04AIucD8Dxedy6Xkk&e= .

In particular, there is a record that specifically monitors CPU usage: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_epics-2Dmodules_iocStats_blob_master_iocAdmin_Db_ioc.template-23L130&d=DwICAg&c=gRgGjJ3BkIsb5y6s49QqsA&r=rFOy-ydFEnpKcV3qYX1tt7JonnG1Pzrsmr398l7QSm4&m=uCbIidZWhQIOD-BoyeOvNjOU1mpW0410IHM8JGvBYDCKytPy0zF2Cpn7knZKU_zb&s=epdhYOowPFxhHltfuC37GNBGq3BdE2xZctk9ug2iPww&e=  (as well as one for memory usage).

Cheers,

Simon

From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of "Wang, Andrew via Tech-talk" <tech-talk@aps.anl.gov>
Reply to: "Wang, Andrew" <wang126@llnl.gov>
Date: Monday, 12 December 2022 at 23:13
To: EPICS tech-talk <tech-talk@aps.anl.gov>
Subject: Checking CPU and memory usage for an IOC

All,

This is a very general question, but I was curious if people here have been able to monitor CPU and memory usage of a particular IOC as it ran. If so, what was the approach you took to do so?

Thank you,
Andy
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End of Tech-talk Digest, Vol 16, Issue 712
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