getting a loaded chunk is one of the most hottest pieces of code in the game.
Often, getChunkAt is called for the same chunk multiple times in a row, often
from getType();
Optimize this look up by using a Last Access cache.
should be fully working now as I pretty much fell back to existing
methods so anything touching the unloadQueue set should behave correctly.
And maintained NMS Reflection safe change too
While the previous logic was logically correct, some CB API's before
would request a chunk without removing it from the unload queue.
While this is logically wrong, some plugins seem to be causing unload issues.
This change will make anything using that one API that use to not remove from
queue, no longer remove from queue.
Hopefully other activities on the server will touch the chunk if it REALLY is in use.
Replace WeakHashMap with an ArrayList and manually manage object
lifecycle. Gives superior iteration performance at a slight cost
to removal performance and also ensures entities are removed immediately
upon losing their validity within the world.
Additionally, change listener registration to be done upon world add
instead of immediate up creation. This provides benefit of only
registering and ticking real Navigation objects, and not invalid
entities (cancelled entity spawns for example).
Use an optimized method to test if a block position meets a desired light level.
This method benefits from returning as soon as the desired light level matches.
Also Optimize Grass more
Mojang included some sanity checks on arguments passed to the BlockData.
This code results in the Hash look up occuring twice per call, one to test if it exists
and another to retrieve the result.
This code should ideally never be hit, unless mojang released a bad build. We can discover bugs with this as furthur code that never expects a null
would then NPE, so it would not result in hidden issues.
This is super hot code, so removing those checks should give decent gains.
Removing chunks from the unload queue when performing chunk lookups is a costly activity.
It drastically slows down server performance as many methods call getChunkAt, resulting in a bandaid
to skip removing chunks from the unload queue.
This patch optimizes the unload queue to instead use a boolean on the Chunk object itself to mark
if the chunk is active, and then insert into a LinkedList queue.
The benefits here is that all chunk unload queue actions are now O(1) constant time.
A LinkedList will never need to resize, and can be removed from in constant time when
used in a queue like method.
We mark the chunk as active in many places that notify it is still being used, so that
when the chunk unload queue reaches that chunk, and sees the chunk became active again,
it will skip it and move to next.
First, Enchantment order would blow away seeing 2 items as the same,
however the Client forces enchantment list in a certain order, as well
as does the /enchant command. Anvils can insert it into forced order,
causing 2 same items to be considered different.
This change makes unhandled NBT Tags and Enchantments use a sorted tree map,
so they will always be in a consistent order.
Additionally, the old enchantment API was never updated when ItemMeta
was added, resulting in 2 different ways to modify an items enchantments.
For consistency, the old API methods now forward to use the
ItemMeta API equivalents, and should deprecate the old API's.
If the server lags out and skips multiple ticks, Furnace cooking behavior would not
cook in the expected amount of time as the cook time was not decremented correctly.
This patch ensures that furnaces cook to the correct wall time expectation.
Metadata is not meant to persist reload as things break badly with non primitive types
This will invalidate metadata on reload so it does not crash everything if a plugin uses it.
Under previous behavior, plugins were not able to check if a player had a permission
if it was defined in permissions.yml. there is no clean way for a plugin to fix that either.
This will change the order so that by default, permissions.yml loads BEFORE plugins instead of after.
This gives plugins expected permission checks.
It also helps improve the expected logic, as servers should set the initial defaults, and then let plugins
modify that. Under the previous logic, plugins were unable (cleanly) override permissions.yml.
A config option has been added for those who depend on the previous behavior, but I don't expect that.
Sometimes a chunk region file is closed prematurely, resulting in a "Stream Closed" error on chunk saving.
Ultimately there is a race condition that causes it, but re-trying the save will avoid the issue.
Retry the save 5 times to try our best to avoid rollbacks due to chunk save failures.
Entities collision is checking for scoreboards setting.
This is very heavy to do map lookups for every collision to check
this setting.
So avoid looking up scoreboards and short circuit to the "not on a team"
logic which is most likely to be true.
This script will build a folder in work/ that includes only
non imported NMS files. This folder can then be added to IDE as a
source to see unimported files without any duplicate class errors
I don't know what the person who wrote that code was smoking, but I
don't think it was good.
Gets rid of the WeakHashMap that mojang was abusing purely to be lazy
on clean up, and handles registering and deregistering navigation
upon world add/remove operations.
For some unknown reason, Minecraft is sleeping 10ms between every single chunk being saved to disk.
Under high chunk load/unload activity (lots of movement / teleporting), this causes the chunk unload queue
to build up in size.
This has multiple impacts:
1) Performance of the unload queue itself - The save thread is pretty ineffecient for how it accesses it
By letting the queue get larger, checking and popping work off the queue can get less performant.
2) Performance of chunk loading - As with #1, chunk loads also have to check this queue when loading
chunk data so that it doesn't load stale data if new data is pending write to disk.
3) Memory Usage - The entire chunk has been serialized to NBT, and now sits in this queue. This leads to
elevated memory usage, and then the objects used in the serialization sit around longer than needed,
resulting in promotion to Old Generation instead of dying young.
If there is work to do, then the thread should be doing its work, and only sleep when it is done.
Minecraft ineffeciently uses OutputStreams by calling .write(int) on the stream.
For Chunks, this is a DeflaterOutputStream, which allocates a single byte EVERY write.
This is causing the server to allocate tons of new byte[1] objects.
Additionally, this is very ineffecient for the Deflate process.
By Buffering Writes the same way it already is Buffering Reads, we will
write to the stream much more effeciently.
Also a more effecient RegionFile zero'ing for new chunks to speed up
new chunk generation.
Re-organizes the servers TileEntity Tick List to be bucketed by type.
This allows the server to skip buckets of Tile Entities that is known to
not have any tick function (half of them), skipping time spent iterating
them and checking if they are valid and in a loaded chunk. In other words,
a lot of "meta" time wasted on tile entities that would never do anything anyways.
This change also adds control into the interval of every TileEntity, giving
the server owner control on how fast a TileEntity ticks, slowing it down if they must
(Such as chest), to improve performance.
Aikar