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Improve mid tick chunk loading, Fix Oversleep, other improvements

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Process loads outside of any canSleep check. Original intent was to
only apply those restrictions to generations but realized I had some
checks higher up the call chain.

Reworked the back off strategy to just run every 1 millisecond per world,
and to apply the per tick limit to generations only.

This guarantees that your chunk will load with at most around 1ms delay.

Additionally, fire midTick processing in a few more places, notably the
oversleep section so we can keep processing loads here too which has
a large up to 50ms window...

Speaking of oversleep, we had a bug in our implementation changes for
Timings that caused oversleep to not sleep the correct amount.

Because we now moved it into the NEXT tick instead of THIS tick, the
value of nextTick had already been increased to +50ms, resulting in
the risk of sleeping more than it should, but, more importantly, this
caused every task that was trying to NOT run during oversleep to actually
run during oversleep.

This is now fixed.

Another small tweak is to the /tps command, to no longer show the star when
TPS is right at 20.

Due to ineffeciencies in the sleep precision, TPS is commonly 20.02.
This causes the star to show up almost constantly, so now only show it if
we actually hit a real "catchup".

This commit also improves the changes to the CallbackExecutor, in that
it now is also recursion safe.

It was possible that the executor could run tasks out of desired order
if the executor task scheduled more executor tasks.

We solve this by ensuring new additions do not enter the currently iterated queue.

Each depth level will have its own queue.

Fixes #3220
This commit is contained in:
Aikar
2020-04-25 23:47:29 -04:00
parent 0e3875914c
commit 879269f221
25 changed files with 225 additions and 176 deletions
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15
Spigot-Server-Patches/Timings-v2.patch
View File

@@ -6,7 +6,7 @@ Subject: [PATCH] Timings v2
diff --git a/src/main/java/co/aikar/timings/MinecraftTimings.java b/src/main/java/co/aikar/timings/MinecraftTimings.java
new file mode 100644
index 0000000000..69e26a8267
index 0000000000..223d3b1125
--- /dev/null
+++ b/src/main/java/co/aikar/timings/MinecraftTimings.java
@@ -0,0 +0,0 @@
@@ -144,7 +144,7 @@ index 0000000000..69e26a8267
+ }*/
+
+ public static Timing getPacketTiming(Packet packet) {
+ return Timings.ofSafe("## Packet - " + packet.getClass().getSimpleName(), packetProcessTimer);
+ return Timings.ofSafe("## Packet - " + packet.getClass().getName(), packetProcessTimer);
+ }
+
+ public static Timing getCommandFunctionTiming(CustomFunction function) {
@@ -749,7 +749,7 @@ index 1f350e3352..35e3f1c78d 100644
}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index b4a0bd7951..456d03be22 100644
index b4a0bd7951..67bdd57747 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -0,0 +0,0 @@ import org.bukkit.craftbukkit.CraftServer;
@@ -781,10 +781,15 @@ index b4a0bd7951..456d03be22 100644
if (this.server != null) {
this.server.disablePlugins();
@@ -0,0 +0,0 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
private boolean canSleepForTick() {
// CraftBukkit start
+ if (isOversleep) return canOversleep();// Paper - because of our changes, this logic is broken
return this.forceTicks || this.isEntered() || SystemUtils.getMonotonicMillis() < (this.ac ? this.ab : this.nextTick);
}
+ // Paper start
+ boolean isOversleep = false;
+ private boolean canOversleep() {
+ return this.hasExecutedTask() && SystemUtils.getMonotonicMillis() < this.getTickOversleepMaxTime();
+ }
@@ -819,11 +824,11 @@ index b4a0bd7951..456d03be22 100644
long i = SystemUtils.getMonotonicNanos();
+ // Paper start - move oversleep into full server tick
+ MinecraftTimings.serverOversleep.startTiming();
+ isOversleep = true;MinecraftTimings.serverOversleep.startTiming();
+ this.awaitTasks(() -> {
+ return !this.canOversleep();
+ });
+ MinecraftTimings.serverOversleep.stopTiming();
+ isOversleep = false;MinecraftTimings.serverOversleep.stopTiming();
+ // Paper end
+
++this.ticks;