Document profiler

[appgurueu]

As well as other profiling methods (LuaJIT, simply wrapping in get_us_time etc)

[benrob0329]

I guess it's about time I pushed this for people to use.

[appgurueu]

Indeed we should mention Lua (debug)-based solutions like https://github.com/charlesmallah/lua-profiler.

[Desour]

Some possibly useful resources:

• dev wiki:
  • https://dev.minetest.net/Lua_Optimization_Tips
  • https://dev.minetest.net/minetest.get_us_time
  • https://dev.minetest.net/Development_Tools#Benchmarking
  • https://dev.minetest.net/Profiler_graph
• luajit stuff:
  • Website:
    • seems a bit outdated: https://luajit.org/index.html
    • luajit 2.0 git doc: https://repo.or.cz/luajit-2.0.git/blob_plain/HEAD:/doc/luajit.html
    • luajit 2.1 git doc: https://repo.or.cz/luajit-2.0.git/blob_plain/refs/heads/v2.1:/doc/luajit.html
  • The profiler: https://repo.or.cz/luajit-2.0.git/blob_plain/refs/heads/v2.1:/doc/ext_profiler.html
  • wiki: http://wiki.luajit.org/Home#performance-tuning-and-testing
  • Note that there are also eg. the "jit.v", "jit.dump" and "jit.p" modules (you'll need to disable mod security).
    Dumping the compiler output can be useful to avoid not-yet-implementeds (NYIs, http://wiki.luajit.org/NYI) and to see what your code results in.
    Dumping can also be done in the web: https://luajit.me/
• builtin profiler:
  • I haven't really found any doc about this so far IIRC, and I have never completely understood its output.
    Your only choice might be to RTFS: https://github.com/minetest/minetest/tree/master/builtin/profiler