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High CPU-load and numerous tasks in background

Scheduled Pinned Locked Moved Troubleshooting
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  • A Offline
    Axel
    last edited by Axel 1 Jun 2018, 19:34 6 Jan 2018, 14:02

    When I load my dashboard (3 grouped sensor graphs) my rpi cpu usage is on 100% for some minutes - even if the dashboard is fully loaded.

    Additionally I'm wondering if it's normal that mycontroller runs approx 36 java processes at once - most of them have 0.0% cpu usage.

    0_1515247279665_htop.PNG

    Further more I've found some errors in my log:

    2018-01-06 14:34:30,369 ERROR [Acme.Utils.ThreadPool(2)-PooledThread: Acme.Serve.Serve$ServeConnection@823c08] [org.mycontroller.standalone.metrics.engines.McMetricEngine:262] Exception,
    java.sql.SQLException: Could not perform raw query for SELECT sensorVariableId, MIN(min) AS min, MAX(max) AS max, SUM(avg*samples)/SUM(samples) AS avg, SUM(samples) AS samples, 1498136632009 AS timestamp FROM metrics_double_type_device WHERE sensorVariableId=101 AND timestamp > 1498136332009 AND timestamp <= 1498136632009 GROUP BY sensorVariableId
    	at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:25)
    

    I've just updated to version 1.1.0 but the behavior was similar with 1.0.0.

    J T 2 Replies Last reply 6 Jan 2018, 17:25 Reply Quote 0
    • J Offline
      jkandasa @Axel
      last edited by 6 Jan 2018, 17:25

      @axel

      Additionally I'm wondering if it's normal that mycontroller runs approx 36 java processes at once - most of them have 0.0% cpu usage.

      Which command are you using to list this? Yes, MyController runs with multi-thread.

      Have you changed metric retention settings? How many days this MyController log data? Do you have frequently changing binary data?

      1 Reply Last reply Reply Quote 0
      • T Offline
        Tag MOD @Axel
        last edited by 6 Jan 2018, 17:30

        @axel

        Are you using the "real" java?
        I had the same issue on an RPI, see this topic and it had to do with the opensource java that comes pre-installed. It was sooooo slow... it was fixed by using the original java version

        1 Reply Last reply Reply Quote 0
        • A Offline
          Axel
          last edited by 7 Jan 2018, 09:03

          I've used htop to list the processes.

          I've changed the metric retention settings as follows:

          Data: Double, Counter
          
          Raw data 1 Minutes
          One minute data 6 Hours
          Five minutes data 10 Days
          One hour data 90 Days
          Six hours data 1 Years
          Twelve hours data 5 Years
          One day data 10 Years
          
          Others
          
          Binary data 180 Days 
          GPS data 180 Days
          

          I've got 4 nodes with 3 sensor values each (humidity, temperature, battery voltage) which send every 5 minutes to a MQTT gateway.

          I've got no binary data.

          The oldest data are three weeks old, the backup file is about 140kb.

          I'm using the follwing java version as descirbed in this tutorial:

          VM vendor Oracle Corporation
          VM name Java HotSpot(TM) Client VM
          VM version 1.8.0_151-b12
          Java home /opt/jdk1.8.0_151/jre
          
          J 1 Reply Last reply 7 Jan 2018, 14:55 Reply Quote 0
          • J Offline
            jkandasa @Axel
            last edited by 7 Jan 2018, 14:55

            @axel I do not see any configuration issue in your setup. Can you send your MyController log file and backup to my email address? Remove/change important information (email, pushbullet, SMS, etc)
            email address jkandasa at gmail dot com

            J 1 Reply Last reply 9 Jan 2018, 05:40 Reply Quote 0
            • J Offline
              jkandasa @jkandasa
              last edited by 9 Jan 2018, 05:40

              @Axel
              Thanks for the logs and backup file. I do not see any issue with MyController restored in my local(I tested with SNAPSHOT version).
              From your log file, I see that MyController takes a lot of time to start[57, 62, 67, 1807 seconds]. seems like your raspberry PI loaded with some other application?
              If yes, I request to stop all other application running in your raspberry PI and try again.
              I recommend using RASPBIAN OS LITE edition.

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