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ivanacostarubio/Profile Rust on Linux.md

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Created January 6, 2020 23:06
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Profiling Rust Applications
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Profile Rust on Linux.md

Profiling performance

Using perf:

$ perf record -g binary
$ perf script | stackcollapse-perf.pl | rust-unmangle | flamegraph.pl > flame.svg

NOTE: See @GabrielMajeri's comments below about the -g option.

This requires you have flamegraph available in your path. The rust-unmangle script is optional but nice.

Also check out @dlaehnemann's more detailed walkthrough about generating flamegraphs here.

Profiling heap memory

Using valgrind (massif) and massif-visualiser:

$ valgrind --tool=massif binary

Also check out heaptrack, it's similar to massif but more useful out-of-the-box. It also has a nice gui experience:

$ heaptrack binary

Debugging

$ rust-gdb binary

Namespaces are prefixed by the crate name, which is probably also the name of the binary. You can do stuff like:

  • break to set breakpoints
  • print to print a variable
  • step,next,finish to step through calls

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