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Bug
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Resolution: Awaiting Response
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None
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1.20.1
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None
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Ubuntu 22.04.2 LTS
OpenJDK 17.0.7+7~us1-0ubuntu1~22.04.2 (latest from repo)
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Community Consensus
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Performance
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Important
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Platform
Description:
Since 1.18.2 (not 1.18.1 or earlier) and up to the current version (1.20.1), saving a small world takes several minutes on a dedicated server.
Specifically, on 1.18.1 I can create a new world and immediately stop the server. The save only takes about 8 seconds. Starting and stopping the server again takes only 2 seconds to save.
1.18.1 Save after world creation
[19:08:54] [Server thread/INFO]: Stopping the server [19:08:54] [Server thread/INFO]: Stopping server [19:08:54] [Server thread/INFO]: Saving players [19:08:54] [Server thread/INFO]: Saving worlds [19:08:54] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:overworld [19:09:02] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:the_nether [19:09:02] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:the_end [19:09:02] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved [19:09:02] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved [19:09:02] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved [19:09:02] [Server thread/INFO]: ThreadedAnvilChunkStorage: All dimensions are saved
However, with the first 1.18.2 snapshot, 22w03a, creating and saving a new world takes ~2 minutes and 10 seconds, and starting and stopping takes about 1 minute and 30 seconds. This is an incredibly a long time for what is a very tiny world (12 MB).
1.18.2 Save after world creation
[19:13:01] [Server thread/INFO]: Stopping the server [19:13:01] [Server thread/INFO]: Stopping server [19:13:01] [Server thread/INFO]: Saving players [19:13:01] [Server thread/INFO]: Saving worlds [19:13:02] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:overworld [19:15:11] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:the_nether [19:15:11] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:the_end [19:15:11] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved [19:15:11] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved [19:15:11] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved [19:15:11] [Server thread/INFO]: ThreadedAnvilChunkStorage: All dimensions are saved
1.20.1 Save after world creation
[19:20:10] [Server thread/INFO]: Stopping the server [19:20:10] [Server thread/INFO]: Stopping server [19:20:10] [Server thread/INFO]: Saving players [19:20:10] [Server thread/INFO]: Saving worlds [19:20:11] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:overworld [19:22:15] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:the_end [19:22:15] [Server thread/INFO]: Saving chunks for level 'ServerLevel[world]'/minecraft:the_nether [19:22:15] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved [19:22:15] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved [19:22:15] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved [19:22:15] [Server thread/INFO]: ThreadedAnvilChunkStorage: All dimensions are saved
For larger worlds with newly explored chunks, I've seen saving take up to 5 minutes!
Interestingly, Paper servers do not have this problem at all, their performance before and after 1.18.1 is fine. I imagine because they patch the chunk saving code.
Environment:
My server has 32GiB of RAM, 16 of which are free. 12 CPUs at about 20% usage. All this seems to suggest that the server has plenty of resources.
What now?
Certainly seems like a regression in 1.18.2+. If there is anything else I can do to help reproduce this, let me know.
- is duplicated by
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- Resolved