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Miscellaneous

Profiling Minetest on Linux

We will be using a tool called "perf", which you can get by installing perf or linux-perf or linux-tools-common.

To get usable results you need to build Minetest with debug symbols (-DCMAKE_BUILD_TYPE=RelWithDebInfo or -DCMAKE_BUILD_TYPE=Debug).

Run the client (or server) like this and do whatever you wanted to test:

perf record -z --call-graph dwarf -- ./bin/minetest

This will leave a file called "perf.data".

You can open this file with perf built-in tools but much more interesting is the visualization using a GUI tool: Hotspot. It will give you flamegraphs, per-thread, per-function views and much more.

Remote Profiling

Attach perf to your running server, press ^C to stop:

perf record -z --call-graph dwarf -F 400 -p "$(pidof minetestserver)"

Collect a copy of the required libraries/executables:

perf buildid-list | grep -Eo '/[^ ]+(minetestserver|\.so)[^ ]*$' | \
	tar -cvahf debug.tgz --files-from=- --ignore-failed-read

Give both files to the developer and also provide:

  • Linux distribution and version
  • commit the source was built from and/or modified source code (if applicable)

Hotspot will resolve symbols correctly when pointing the sysroot option at the collected libs.