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[Unity Netcode] Jittery movement when SimulationTickRate and NetworkTick rate is 30

Discussion in 'NetCode for ECS' started by khalid_mightybear, Feb 17, 2020.

  1. khalid_mightybear

    khalid_mightybear

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    Sep 10, 2017
    Posts:
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    The red cube from the NetCube scene in the netcode samples is very jittery when the simulationtickrate and networktickrate is set to 30. Works fine when it is set to 60.

    I get a few warnings:
    Internal: JobTempAlloc has allocations that are more than 4 frames old - this is not allowed and likely a leak
    Internal: deleting an allocation that is older than its permitted lifetime of 4 frames (age = 5)
     
    khalid_mightybear, Feb 17, 2020
    #1

  2. khalid_mightybear

    khalid_mightybear

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    Oops, my error. I converted the ClientServerTickRate on both the client and the server. So, there's 2 ClientServerTickRate on the client side, one that I created and another that is probably created in NetCode. Since it's no longer a singleton, it failed to query for a singleton and used the default values. The fix was just to convert the entity on the server side
     
    khalid_mightybear, Feb 18, 2020
    #2

  3. timjohansson

    timjohansson

    Unity Technologies

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    Good that you found the problem. I have filed an issue for us to improve the error message to make it easier to figure out for the next person to run into it.
     
    timjohansson, Feb 18, 2020
    #3
    Opeth001 and florianhanke like this.

  4. AdamBebko

    AdamBebko

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    I have this problem, but am a complete noob. How exactly did you set this TickRate?

    Edit: Just finished the getting started guide for NetCode, and getting jittery movement and allocation warnings. Haven't customized anything at all.
     
    AdamBebko, Jul 21, 2020
    #4
    WireWhiz likes this.

  5. Virland

    Virland

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    Hello! Version: 2020.1.2f1.4316 Personal, NetCode Version 0.2.0-preview.5 - June 05, 2020
    I just created a new project, installed netcode, pressed the play button and now getting warnings spam

    Internal: JobTempAlloc has allocations that are more than 4 frames old - this is not allowed and likely a leak

    Internal: deleting an allocation that is older than its permitted lifetime of 4 frames (age = 5)
    Unity.Collections.LowLevel.Unsafe.UnsafeUtility:Free(Void*, Allocator)
    Unity.Entities.EntityCommandBufferData:DestroyConcurrentAccess() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/EntityCommandBuffer.cs:405)
    Unity.Entities.EntityCommandBuffer:Dispose() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/EntityCommandBuffer.cs:1014)
    Unity.Entities.EntityCommandBufferSystem:FlushPendingBuffers(Boolean) (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/EntityCommandBufferSystem.cs:249)
    Unity.Entities.EntityCommandBufferSystem:OnUpdate() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/EntityCommandBufferSystem.cs:188)
    Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystem.cs:109)
    Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystemGroup.cs:445)
    Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystemGroup.cs:398)
    Unity.NetCode.ServerSimulationSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.netcode@0.2.0-preview.5/Runtime/ClientServerWorld/ServerSimulationSystemGroup.cs:74)
    Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystem.cs:109)
    Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystemGroup.cs:445)
    Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystemGroup.cs:398)
    Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystem.cs:109)
    Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystemGroup.cs:445)
    Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystemGroup.cs:398)
    Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ComponentSystem.cs:109)
    Unity.Entities.DummyDelegateWrapper:TriggerUpdate() (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities/ScriptBehaviourUpdateOrder.cs:192)

    Is it okay?
     
    Last edited: Aug 21, 2020
    Virland, Aug 21, 2020
    #5

  6. timjohansson

    timjohansson

    Unity Technologies

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    The 4 frames old warning is because the server is running with a fixed timestep. When your game is fast enough one server frame is actually more than 4 render frames, and Unity uses render frames to measure age. For that reason it is not possible to free the data within 4 frames in a server world.
    We will try to figure out a way to deal with that better, in the meantime the only workaround I know of is to enable VSync under the "Free Aspect" dropdown in the game view.
     
    timjohansson, Aug 21, 2020
    #6
    Cuttlas-U, friflo, AdamBebko and 2 others like this.

  7. AdamBebko

    AdamBebko

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    Is this needed only in server? Or is this an editor-specific problem?
     
    AdamBebko, Sep 11, 2020
    #7

  8. FakeByte

    FakeByte

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    Its a Netcode problem, has nothing to do with the editor. If you build a standalone server the problem will still be there.
     
    FakeByte, Sep 12, 2020
    #8

  9. Cuttlas-U

    Cuttlas-U

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    yep , I have the problem on the recent update v 0.6.0;
    the only workaround was to lock target frame rate on 200 in the server build ;
     
    Cuttlas-U, Apr 17, 2021
    #9

  10. CMarastoni

    CMarastoni

    Unity Technologies

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    It is neither a NetCode issue too, this is more like a general "issue" due to how the allocation leak tracking works. If all your game (not just one system) run at fixed time steps larger than the rendering frame time you will get this error.
     
    CMarastoni, Apr 20, 2021
    #10
    Cuttlas-U likes this.

  11. optimise

    optimise

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    @CMarastoni I see. Is there plan to change the behavior of allocation leak tracking? I believe it's belongs to job system right?
     
    optimise, Apr 20, 2021
    #11