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48 lines
2 KiB
Markdown
48 lines
2 KiB
Markdown
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# Tune JIT `tune_jit`
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A Luanti mod tuning LuaJIT parameters to improve server performance by
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preventing constant GC.
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## Wait, what does it exactly do?
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At a base level, this mod implements the same thing as [VoxeLibre](https://git.minetest.land/VoxeLibre/VoxeLibre/src/commit/161dbaea03a7816db1393ca767c84a5f275ef162/mods/CORE/mcl_init/tune_jit.lua)
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and [Mineclonia](https://codeberg.org/mineclonia/mineclonia/src/commit/94467d9f822ae31838e3c76d643950be2ee891f8/mods/ENTITIES/mcl_mobs/pathfinding.lua#L1627-L1636)
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but for other Luanti games, with more configurability for the server operator.
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[The `jit.opt.*` API](https://luajit.org/ext_jit.html) is leveraged in order to
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modify JIT compiler optimization parameters on server startup. This won't work
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with LuaJIT 1.x, but if you have a LuaJIT that ancient, most of your server-side
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performance issues should go away after you upgrade it. The coolest thing is
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that this mod doesn't have to be in the `secure.trusted_mods` list in order to
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apply the parameters.
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In [@halon](https://codeberg.org/halon)'s words:
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> Large minetest servers on stock luajit spend most of their globalsteps
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> recording and jit compiling traces that are evicted for exceeding one of the
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> minuscule limits on trace count or mcode size defined by default
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The specific parameters that are modified are `maxtrace`, `maxrecord`,
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`minstitch` and `maxmcode`. Please refer to this mod's `settingtypes.txt` and
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LuaJIT documentation for details.
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## Will it help with client-side lag?
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Unless it was the server's fault, no.
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For singleplayer, remember that Luanti just starts up a server under the hood
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and connects you to it, with the same server/client communication rules and
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specifics. The only difference is that both server and client are now ran on the
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same machine, though most likely in different threads.
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Mobs freezing and map generation suddenly stopping might get removed, but this
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won't have any effect on rendering or audio playback.
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## License
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The source code is licensed under 0BSD ("public domain"). See `LICENSE` file for
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details.
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