self-profile
The -Zself-profile
compiler flag enables rustc's internal profiler.
When enabled, the compiler will output three binary files in the specified directory (or the current working directory if no directory is specified).
These files can be analyzed by using the tools in the measureme
repository.
To control the data recorded in the trace files, use the -Zself-profile-events
flag.
For example:
First, run a compilation session and provide the -Zself-profile
flag:
$ rustc --crate-name foo -Zself-profile
This will generate three files in the working directory such as:
foo-1234.events
foo-1234.string_data
foo-1234.string_index
Where foo
is the name of the crate and 1234
is the process id of the rustc process.
To get a summary of where the compiler is spending its time:
$ ../measureme/target/release/summarize summarize foo-1234
To generate a flamegraph of the same data:
$ ../measureme/target/release/inferno foo-1234
To dump the event data in a Chromium-profiler compatible format:
$ ../measureme/target/release/crox foo-1234
For more information, consult the measureme
documentation.