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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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25
Spigot-Server-Patches/Asynchronous-chunk-IO-and-loading.patch
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@@ -3022,7 +3022,7 @@ index 2dcecc1bbd..d9941b38ca 100644
+ }
}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 7ca4a7cca8..61fc659ed2 100644
index 7ecf781263..26be349870 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -0,0 +0,0 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
@@ -3113,7 +3113,7 @@ index f1620ba80e..74e6b8b973 100644
completablefuture = (CompletableFuture) this.statusFutures.get(i);
if (completablefuture != null) {
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index b4c9d544fe..7e5fa016c7 100644
index b4c9d544fe..c4fb0c68dd 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -0,0 +0,0 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
@@ -3293,21 +3293,21 @@ index b4c9d544fe..7e5fa016c7 100644
-
- if (nbttagcompound != null) {
- boolean flag = nbttagcompound.hasKeyOfType("Level", 10) && nbttagcompound.getCompound("Level").hasKeyOfType("Status", 8);
-
- if (flag) {
- ProtoChunk protochunk = ChunkRegionLoader.loadChunk(this.world, this.definedStructureManager, this.m, chunkcoordintpair, nbttagcompound);
+ if (ioThrowable != null) {
+ com.destroystokyo.paper.io.IOUtil.rethrow(ioThrowable);
+ }
- protochunk.setLastSaved(this.world.getTime());
- return Either.left(protochunk);
- }
- if (flag) {
- ProtoChunk protochunk = ChunkRegionLoader.loadChunk(this.world, this.definedStructureManager, this.m, chunkcoordintpair, nbttagcompound);
+ this.getVillagePlace().loadInData(chunkcoordintpair, chunkHolder.poiData);
+ chunkHolder.tasks.forEach(Runnable::run);
+ // Paper - async load completes this
+ // Paper end
- protochunk.setLastSaved(this.world.getTime());
- return Either.left(protochunk);
- }
-
- PlayerChunkMap.LOGGER.error("Chunk file at {} is missing level data, skipping", chunkcoordintpair);
+ // Paper start - This is done async
+ if (chunkHolder.protoChunk != null) {
@@ -3328,8 +3328,13 @@ index b4c9d544fe..7e5fa016c7 100644
+ CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> ret = new CompletableFuture<>();
+
+ Consumer<ChunkRegionLoader.InProgressChunkHolder> chunkHolderConsumer = (ChunkRegionLoader.InProgressChunkHolder holder) -> {
+ PlayerChunkMap.this.executor.addTask(() -> {
+ ret.complete(syncLoadComplete.apply(holder, null));
+ // Go into the chunk load queue and not server task queue so we can be popped out even faster.
+ com.destroystokyo.paper.io.chunk.ChunkTaskManager.queueChunkWaitTask(() -> {
+ try {
+ ret.complete(syncLoadComplete.apply(holder, null));
+ } catch (Exception e) {
+ ret.completeExceptionally(e);
+ }
+ });
+ };
+