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Fix some bugs in ThreadedTicketLevelPropagator

Browse Source 
First, when a section update is stolen, the thread that acquires
the stolen update should remove the update from the update queue
before returning to mark it as completed and allow other threads
waiting on the update to continue. This fixes a deadlock issue
with section updates.

Fix incorrect decrease queue resize. Previously, it attempted
to resize the _increase_ queue, which is the wrong queue.

Use ALL_DIRECTIONS_BITSET for every decrease queue direction bitset
as decrease propagation cancellation due to neighbour values exceeding
the target decrease value cause some neighbour directions to not
be checked, which causes the final update grid to be incorrect.
This commit is contained in:
Spottedleaf 2023-05-15 21:29:38 -07:00
parent ed61eb315e
commit f15f1ceab5
1 changed files with 77 additions and 12 deletions
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89
patches/server/0025-Use-coordinate-based-locking-to-increase-chunk-syste.patch
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@ -3506,10 +3506,10 @@ index 5170b43743ea27a5c2aaee37d76f4e7e730fd808..1a4d820535f7b04671525c4f0e8691c9
if (lock) {
diff --git a/src/main/java/io/papermc/paper/threadedregions/ThreadedTicketLevelPropagator.java b/src/main/java/io/papermc/paper/threadedregions/ThreadedTicketLevelPropagator.java
new file mode 100644
index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee7195d44c
index 0000000000000000000000000000000000000000..b052dcc7745d461b3b26eebccb655606696bf692
--- /dev/null
+++ b/src/main/java/io/papermc/paper/threadedregions/ThreadedTicketLevelPropagator.java
@@ -0,0 +1,1415 @@
@@ -0,0 +1,1480 @@
+package io.papermc.paper.threadedregions;
+
+import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue;
@ -3679,6 +3679,9 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ if (section != this.sections.get(new Coordinate(sectionX, sectionZ))) {
+ // occurs when a stolen update deletes this section
+ // it is possible that another update is scheduled, but that one will have the correct section
+ if (node != null) {
+ this.updateQueue.remove(node);
+ }
+ return false;
+ }
+
@ -4194,16 +4197,31 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ this.sectionZ = sectionZ;
+ }
+
+ public boolean isZero() {
+ for (final short val : this.levels) {
+ if (val != 0) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ @Override
+ public String toString() {
+ final StringBuilder ret = new StringBuilder();
+
+ for (int x = 0; x < SECTION_SIZE; ++x) {
+ ret.append("x=").append(x).append("\n");
+ ret.append("levels x=").append(x).append("\n");
+ for (int z = 0; z < SECTION_SIZE; ++z) {
+ final short v = this.levels[x | (z << SECTION_SHIFT)];
+ ret.append(v & 0xFF).append(".");
+ }
+ ret.append("\n");
+ ret.append("sources x=").append(x).append("\n");
+ for (int z = 0; z < SECTION_SIZE; ++z) {
+ final short v = this.levels[x | (z << SECTION_SHIFT)];
+ ret.append((v >>> 8) & 0xFF).append(".");
+ }
+ ret.append("\n\n");
+ }
+
@ -4521,7 +4539,6 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ final int tailingBit = (-propagateDirectionBitset) & propagateDirectionBitset;
+ propagateDirectionBitset ^= tailingBit;
+
+
+ // pDecode is from [0, 2], and 1 must be subtracted to fully decode the offset
+ // it has been split to save some cycles via parallelism
+ final int pDecodeX = (set & 3);
@ -4689,10 +4706,6 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ // nstartidx2 = x rel -1 for z rel 0 = line after line2, so we can just add 8 (row length of bitset)
+ final long bitsetLine3 = currentPropagation & (7L << (start + (8 + 8)));
+
+ // remove ("take") lines from bitset
+ // can't do this during decrease, TODO WHY?
+ //currentPropagation ^= (bitsetLine1 | bitsetLine2 | bitsetLine3);
+
+ // now try to propagate
+ final Section section = this.sections[sectionIndex];
+
@ -4717,6 +4730,10 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ continue;
+ }
+
+ // remove ("take") lines from bitset
+ // can't do this during decrease, TODO WHY?
+ //currentPropagation ^= (bitsetLine1 | bitsetLine2 | bitsetLine3);
+
+ // update level
+ section.levels[localIndex] = (short)((currentStoredLevel & ~0xFF));
+ updatedPositions.putAndMoveToLast(Coordinate.key(offX, offZ), (byte)0);
@ -4746,12 +4763,12 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ // don't queue update if toPropagate cannot propagate anything to neighbours
+ // (for increase, propagating 0 to neighbours is useless)
+ if (queueLength >= queue.length) {
+ queue = this.resizeIncreaseQueue();
+ queue = this.resizeDecreaseQueue();
+ }
+ queue[queueLength++] =
+ ((long)(offX + (offZ << COORDINATE_BITS) + encodeOffset) & ((1L << (COORDINATE_BITS + COORDINATE_BITS)) - 1)) |
+ ((toPropagate & (LEVEL_COUNT - 1L)) << (COORDINATE_BITS + COORDINATE_BITS)) |
+ childPropagation; //(ALL_DIRECTIONS_BITSET << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS));
+ (ALL_DIRECTIONS_BITSET << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)); //childPropagation;
+ continue;
+ }
+ }
@ -4821,7 +4838,7 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ private static final java.util.Random random = new java.util.Random(4L);
+ private static final List<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void>> walkers =
+ new java.util.ArrayList<>();
+ static final int PLAYERS = 100;
+ static final int PLAYERS = 0;
+ static final int RAD_BLOCKS = 10000;
+ static final int RAD = RAD_BLOCKS >> 4;
+ static final int RAD_BIG_BLOCKS = 100_000;
@ -4830,6 +4847,11 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ static final int BIG_PLAYERS = 50;
+ static final double WALK_CHANCE = 0.10;
+ static final double TP_CHANCE = 0.01;
+ static final int TP_BACK_PLAYERS = 200;
+ static final double TP_BACK_CHANCE = 0.25;
+ static final double TP_STEAL_CHANCE = 0.25;
+ private static final List<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void>> tpBack =
+ new java.util.ArrayList<>();
+
+ public static void main(final String[] args) {
+ final ReentrantAreaLock ticketLock = new ReentrantAreaLock(SECTION_SHIFT);
@ -4861,7 +4883,7 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+ };
+
+ for (;;) {
+ if (walkers.isEmpty()) {
+ if (walkers.isEmpty() && tpBack.isEmpty()) {
+ for (int i = 0; i < PLAYERS; ++i) {
+ int rad = i < BIG_PLAYERS ? RAD_BIG : RAD;
+ int posX = random.nextInt(-rad, rad + 1);
@ -4886,6 +4908,30 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+
+ walkers.add(map);
+ }
+ for (int i = 0; i < TP_BACK_PLAYERS; ++i) {
+ int rad = RAD_BIG;
+ int posX = random.nextInt(-rad, rad + 1);
+ int posZ = random.nextInt(-rad, rad + 1);
+
+ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = new io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<>(null) {
+ @Override
+ protected void addCallback(Void parameter, int chunkX, int chunkZ) {
+ int src = 45 - 31 + 1;
+ ref.setSource(chunkX, chunkZ, src);
+ propagator.setSource(chunkX, chunkZ, src);
+ }
+
+ @Override
+ protected void removeCallback(Void parameter, int chunkX, int chunkZ) {
+ ref.removeSource(chunkX, chunkZ);
+ propagator.removeSource(chunkX, chunkZ);
+ }
+ };
+
+ map.add(posX, posZ, random.nextInt(1, 63));
+
+ tpBack.add(map);
+ }
+ } else {
+ for (int i = 0; i < PLAYERS; ++i) {
+ if (random.nextDouble() > WALK_CHANCE) {
@ -4913,6 +4959,25 @@ index 0000000000000000000000000000000000000000..362d9f1c8551e6d94726764a9abaa3ee
+
+ map.update(posX, posZ, VD);
+ }
+
+ for (int i = 0; i < TP_BACK_PLAYERS; ++i) {
+ if (random.nextDouble() > TP_BACK_CHANCE) {
+ continue;
+ }
+
+ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = tpBack.get(i);
+
+ map.update(-map.lastChunkX, -map.lastChunkZ, random.nextInt(1, 63));
+
+ if (random.nextDouble() > TP_STEAL_CHANCE) {
+ propagator.performUpdate(
+ map.lastChunkX >> SECTION_SHIFT, map.lastChunkZ >> SECTION_SHIFT, schedulingLock, null, null
+ );
+ propagator.performUpdate(
+ (-map.lastChunkX >> SECTION_SHIFT), (-map.lastChunkZ >> SECTION_SHIFT), schedulingLock, null, null
+ );
+ }
+ }
+ }
+
+ ref.propagateUpdates();