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  1. Minecraft: Java Edition
  2. MC-149018

High Idle CPU usage on Server Edition (Minecraft 1.14 Release)

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: Minecraft 1.14 Pre-Release 5, Minecraft 1.14, Minecraft 1.14.1 Pre-Release 1, Minecraft 1.14.1 Pre-Release 2, Minecraft 1.14.1, Minecraft 1.14.2 Pre-Release 2, Minecraft 1.14.2 Pre-Release 3, Minecraft 1.14.2, Minecraft 1.14.3, Minecraft 1.14.4 Pre-Release 6
    • Labels:
      None
    • Environment:
    • Confirmation Status:
      Community Consensus
    • Category:
      Performance
    • Mojang Priority:
      Important

      Description

      It seems when Minecraft 1.14 is idle, it still continues to consume CPU at a significantly higher rate than its predecessors like Minecraft 1.13.2

       

      I've compared the 2 side by side from VisualVM on both Linux and Windows, but I cannot find the cause when I run a snapshot from CPU Sampler. Both results are same, but the CPU consumption is too high on 1.14.

       

      I have included screenshots from VisualVM running both Minecraft 1.13.2 and Minecraft 1.14

       

      1.13.2 - Fresh start, No players, Monsters on, Animals on. 1GB RAM Allocated

       

      1.14: Fresh start, No players, Monsters on, Animals on. 1GB RAM Allocated

       

      Results did not change when I turned off Animals and Monsters.

       

      Additional notes: 
      On Windows, the problem is  slightly intermittent... sometimes it might run smoothly and then its almost like something triggers it to go out of idle mode and start munching CPU.
      On Linux the problem occurs 100% of the time.

       

      A second issue (which could be related) is that Minecraft is consuming up the server thread by 100% nearly all the time. Players join and stay in a single area, but seems like the Server Thread is still doing something way abnormally high. (Appears to be working with chunks, even though chunks are loaded, perhaps a bug in chunk loading / looping?)

      As a result, the server console repeatedly reports falling behind in ticks by 80ms to 2000ms. 

      NOTE: I have found that the second issue is a  known duplicate: https://bugs.mojang.com/browse/MC-138550

      So this bug will now only focus on the first issue, which is high IDLE cpu usage. Minecraft server instance uses a considerable amount of CPU with no players in server. It is also a significant waste of earth resources considering how many instances of Minecraft 1.14 is running around the world.

       

       

       

       

       

        Attachments

        1. debug-report-2019-07-02_12.05.12.zip
          20 kB
        2. firstload.png
          firstload.png
          335 kB
        3. image-2019-04-22-17-22-01-203.png
          image-2019-04-22-17-22-01-203.png
          87 kB
        4. image-2019-04-22-17-22-24-609.png
          image-2019-04-22-17-22-24-609.png
          117 kB
        5. image-2019-09-25-13-57-54-901.png
          image-2019-09-25-13-57-54-901.png
          54 kB
        6. MC server CPU test.jpg
          MC server CPU test.jpg
          84 kB
        7. minecraft 1.13.2 after 20 mins windows.JPG
          minecraft 1.13.2 after 20 mins windows.JPG
          226 kB
        8. minecraft 1.14 after 20 mins windows.JPG
          minecraft 1.14 after 20 mins windows.JPG
          251 kB
        9. mintty_2019-07-04_18-20-40.png
          mintty_2019-07-04_18-20-40.png
          10 kB
        10. profile-results-2019-07-02_12.05.07.txt
          22 kB
        11. Screenshot_2019-04-30_10-24-16.png
          Screenshot_2019-04-30_10-24-16.png
          103 kB
        12. Screen Shot 2019-07-15 at 11.01.51 PM.png
          Screen Shot 2019-07-15 at 11.01.51 PM.png
          78 kB
        13. secondload.png
          secondload.png
          307 kB
        14. SERV.png
          SERV.png
          33 kB

          Issue Links

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              • Assignee:
                fry [Mojang] Georgii Gavrichev
                Reporter:
                ultramoo Mudassar Khan
              • Votes:
                59 Vote for this issue
                Watchers:
                48 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:
                  CHK: