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01a13871de
Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
89 lines
3.7 KiB
Diff
89 lines
3.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Wed, 15 Apr 2020 18:23:28 -0700
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Subject: [PATCH] Optimise ArraySetSorted#removeIf
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Remove iterator allocation and ensure the call is always O(n)
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diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java
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index 9309ea89a440606be3e56ef634f5048a72b0009e..1d1ea158d095bb69260929e8d84f2632a875c136 100644
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--- a/src/main/java/net/minecraft/server/level/DistanceManager.java
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+++ b/src/main/java/net/minecraft/server/level/DistanceManager.java
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@@ -86,13 +86,27 @@ public abstract class DistanceManager {
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protected void purgeStaleTickets() {
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++this.ticketTickCounter;
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ObjectIterator objectiterator = this.tickets.long2ObjectEntrySet().fastIterator();
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+ // Paper start - use optimised removeIf
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+ long[] currChunk = new long[1];
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+ long ticketCounter = DistanceManager.this.ticketTickCounter;
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+ java.util.function.Predicate<Ticket<?>> removeIf = (ticket) -> {
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+ final boolean ret = ticket.timedOut(ticketCounter);
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+ if (ret) {
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+ this.tickingTicketsTracker.removeTicket(currChunk[0], ticket);
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+ }
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+ return ret;
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+ };
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+ // Paper end - use optimised removeIf
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while (objectiterator.hasNext()) {
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Entry<SortedArraySet<Ticket<?>>> entry = (Entry) objectiterator.next();
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- Iterator<Ticket<?>> iterator = ((SortedArraySet) entry.getValue()).iterator();
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- boolean flag = false;
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+ // Paper start - use optimised removeIf
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+ Iterator<Ticket<?>> iterator = null;
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+ currChunk[0] = entry.getLongKey();
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+ boolean flag = entry.getValue().removeIf(removeIf);
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- while (iterator.hasNext()) {
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+ while (false && iterator.hasNext()) {
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+ // Paper end - use optimised removeIf
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Ticket<?> ticket = (Ticket) iterator.next();
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if (ticket.timedOut(this.ticketTickCounter)) {
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diff --git a/src/main/java/net/minecraft/util/SortedArraySet.java b/src/main/java/net/minecraft/util/SortedArraySet.java
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index d1b2ba24ef54e01c6249c3b2ca16e80f03c001a6..5f1c4c6b9e36f2d6ec43b82cc0e2cae24b800dc4 100644
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--- a/src/main/java/net/minecraft/util/SortedArraySet.java
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+++ b/src/main/java/net/minecraft/util/SortedArraySet.java
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@@ -22,6 +22,41 @@ public class SortedArraySet<T> extends AbstractSet<T> {
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this.contents = (T[])castRawArray(new Object[initialCapacity]);
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}
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}
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+ // Paper start - optimise removeIf
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+ @Override
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+ public boolean removeIf(java.util.function.Predicate<? super T> filter) {
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+ // prev. impl used an iterator, which could be n^2 and creates garbage
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+ int i = 0, len = this.size;
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+ T[] backingArray = this.contents;
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+
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+ for (;;) {
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+ if (i >= len) {
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+ return false;
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+ }
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+ if (!filter.test(backingArray[i])) {
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+ ++i;
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+ continue;
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+ }
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+ break;
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+ }
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+
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+ // we only want to write back to backingArray if we really need to
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+
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+ int lastIndex = i; // this is where new elements are shifted to
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+
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+ for (; i < len; ++i) {
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+ T curr = backingArray[i];
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+ if (!filter.test(curr)) { // if test throws we're screwed
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+ backingArray[lastIndex++] = curr;
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+ }
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+ }
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+
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+ // cleanup end
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+ Arrays.fill(backingArray, lastIndex, len, null);
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+ this.size = lastIndex;
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+ return true;
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+ }
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+ // Paper end - optimise removeIf
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public static <T extends Comparable<T>> SortedArraySet<T> create() {
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return create(10);
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