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change only affects the editing user's experience. Non-editing users will see nothing different from the current 'slow' result. See comments for the thought process and how the issues surrounding terrain editing, cache, bandwidth, threading, terrain patch reliability and throttling were balanced.
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forget conditions.
I generally prefer this approach for regression tests because of the complexity of accounting for different threading conditions.
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immediately if any data was sent, rather than waiting.
What I believe is happening is that on initial terrain send, this is done one packet at a time.
With WaitOne, the outbound loop has enough time to loop and wait again after the first packet before the second, leading to a slower send.
This approach instead does not wait if a packet was just sent but instead loops again, which appears to lead to a quicker send without losing the cpu benefit of not continually looping when there is no outbound data.
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d9d995914c5fba00d4ccaf66b899384c8ea3d5eb (r/23185) -- the WaitOne on the UDPServer. Putting it back to how it was done solves the issue. But this may impact CPU usage, so I'm pushing it to test if it does."
This reverts commit 59b461ac0eaae1cc34bb82431106fdf0476037f3.
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d9d995914c5fba00d4ccaf66b899384c8ea3d5eb (r/23185) -- the WaitOne on the UDPServer. Putting it back to how it was done solves the issue. But this may impact CPU usage, so I'm pushing it to test if it does.
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reflect it is a timeout due to no data received rather than an ack issue.
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I accidentally left in a test line to force very quick client unack
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add this to the StatsManager
This reflects the actual use of this stat - it hasn't recorded general exceptions for some time.
Make the sim extra stats collector draw the data from the stats manager rather than maintaing this data itself.
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with high priority and hopefully gets to the client before AgentMovementComplete
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the destination is being checked)
In this new protocol, and as committed before, the viewer is not sent EnableSimulator/EstablishChildCommunication for the destination. Instead, it is sent TeleportFinish directly. TeleportFinish, in turn, makes the viewer send a UserCircuitCode packet followed by CompleteMovementIntoRegion packet. These 2 packets tend to occur one after the other almost immediately to the point that when CMIR arrives the client is not even connected yet and that packet is ignored (there might have been some race conditions here before); then the viewer sends CMIR again within 5-8 secs. But the delay between them may be higher in busier regions, which may lead to race conditions.
This commit improves the process so there are are no race conditions at the destination. CompleteMovement (triggered by the viewer) waits until Update has been sent from the origin. Update, in turn, waits until there is a *root* scene presence -- so making sure CompleteMovement has run MakeRoot. In other words, there are two threadlets at the destination, one from the viewer and one from the origin region, waiting for each other to do the right thing. That makes it safe to close the agent at the origin upon return of the Update call without having to wait for callback, because we are absolutely sure that the viewer knows it is in th new region.
Note also that in the V1 protocol, the destination was getting UseCircuitCode from the viewer twice -- once on EstablishAgentCommunication and then again on TeleportFinish. The second UCC was being ignored, but it shows how we were not following the expected steps...
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waiting to be processed at the second stage (after initial UDP processing)
If this consistently increases then this is a problem since it means the simulator is receiving more requests than it can distribute to other parts of the code.
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packets sent by a region per second
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taking on the initial processing of a UDP packet.
If we're not receiving packets with multiple threads (m_asyncPacketHandling) then this is critical since it will limit the number of incoming UDP requests that the region can handle and affects packet loss.
If m_asyncPacketHandling then this is less critical though a long process will increase the scope for threads to race.
This is an experimental stat which may be changed.
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AgentUpdate packet. This fixes the problem with vehicles not moving forward
after the first up-arrow.
Code to fix a potential exception when using different IClientAPIs.
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the equation. (head rotation was the problematic one)
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lkalif for telling me how to route the information. The viewer effect is under the distance filter, so only avatars with cameras < 10m away see the beams.
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- The existing event to scene has been split into 2: OnAgentUpdate and OnAgentCameraUpdate, to better reflect the two types of updates that the viewer sends. We can run one without the other, which is what happens when the avie is still but the user is camming around
- Added thresholds (as opposed to equality) to determine whether the update is significant or not. I thin these thresholds are ok, but we can play with them later
- Ignore updates of HeadRotation, which were problematic and aren't being used up stream
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observations about AgentUpdates.
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significant much earlier in UDP processing (i.e. before we pointlessly place such packets on internal queues, etc.)
Appears to have some impact on cpu but needs testing.
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to "show client stats" (i.e. sent on for further processing instead of being discarded)
Added here since it was the most convenient place
Number is in the last column, "Sig. AgentUpdates" along with percentage of all AgentUpdates
Percentage largely falls over time, most cpu for processing AgentUpdates may be in UDP processing as turning this off even earlier (with "debug lludp toggle agentupdate" results in a big cpu fall
Also tidies up display.
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AgentUpdate in packets to be discarded at a very early stage.
Enabling this will stop anybody from moving on a sim, though all other updates should be unaffected.
Appears to make some cpu difference on very basic testing with a static standing avatar (though not all that much).
Need to see the results with much higher av numbers.
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threads are started/stopped
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stop out" from actually doing anything
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always performing these on a separate fired thread.
This appears to improve cpu usage since launching a new thread is more expensive than performing a small amount of inline logic.
However, needs testing at scale.
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a continuous loop with sleeps.
Does appear to have a cpu impact but may need further tweaking
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This reverts commit b060ce96d93a33298b59392210af4d336e0d171b.
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Revert "Trying to hunt the CPU spikes recently experienced."
This reverts commit ac73e702935dd4607c13aaec3095940fba7932ca.
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Revert "Comment out old inbound UDP throttling hack. This would cause the UDP"
This reverts commit 38e6da5522a53c7f65eac64ae7b0af929afb1ae6.
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TriggerOnMakeRootAgent to the end of CompleteMovement.
Justin, if you read this, there's a long story here. Some time ago you placed SendInitialDataToMe at the very beginning of client creation (in LLUDPServer). That is problematic, as we discovered relatively recently: on TPs, as soon as the client starts getting data from child agents, it starts requesting resources back *from the simulator where its root agent is*. We found this to be the problem behind meshes missing on HG TPs (because the viewer was requesting the meshes of the receiving sim from the departing grid). But this affects much more than meshes and HG TPs. It may also explain cloud avatars after a local TP: baked textures are only stored in the simulator, so if a child agent receives a UUID of a baked texture in the destination sim and requests that texture from the departing sim where the root agent is, it will fail to get that texture.
Bottom line: we need to delay sending the new simulator data to the viewer until we are absolutely sure that the viewer knows that its main agent is in a new sim. Hence, moving it to CompleteMovement.
Now I am trying to tune the initial rez delay that we all experience in the CC. I think that when I fixed the issue described above, I may have moved SendInitialDataToMe to much later than it should be, so now I'm moving to earlier in CompleteMovement.
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are also non-blocking handlers.
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checks may block, so they get a FireAndForget. Everything else is non-blocking.
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This _shouldn't_ screw things up, given that all this does is to dump the request in a queue.
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requesting.
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reception thread to sleep for 30ms if the number of available user worker
threads got low. It doesn't look like any of the UDP packet types are
marked async so this check is 1) unnecessary and 2) really crazy since
it stops up the reception thread under heavy load without any indication.
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main inbound UDP processing loop, to avoid any chance that this is delaying the main udp in loop.
The potential impact of this should be lower now that these requests are being placed on a queue.
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to be performed immediately from client start
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