qudit-expr 0.3.2

Accelerated and Extensible Quantum Library
Documentation 
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use std::ffi::c_int;
use std::fs::File;
use std::path::Path;

use criterion::profiler::Profiler;
use pprof::ProfilerGuard;

/// Simple profiler that generates a flamegraph of the benchmark.
pub struct FlamegraphProfiler<'a> {
    frequency: c_int,
    active_profiler: Option<ProfilerGuard<'a>>,
}

impl<'a> FlamegraphProfiler<'a> {
    pub fn new(frequency: c_int) -> Self {
        FlamegraphProfiler {
            frequency,
            active_profiler: None,
        }
    }
}

impl<'a> Profiler for FlamegraphProfiler<'a> {
    fn start_profiling(&mut self, _benchmark_id: &str, _benchmark_dir: &Path) {
        self.active_profiler = Some(ProfilerGuard::new(self.frequency).unwrap());
    }

    fn stop_profiling(&mut self, _benchmark_id: &str, benchmark_dir: &Path) {
        std::fs::create_dir_all(benchmark_dir).unwrap();
        let flamegraph_path = benchmark_dir.join("flamegraph.svg");
        let flamegraph_file = File::create(&flamegraph_path)
            .expect("File system error while creating flamegraph.svg");
        let mut options = pprof::flamegraph::Options::default();
        options.image_width = Some(3600);
        if let Some(profiler) = self.active_profiler.take() {
            profiler
                .report()
                .build()
                .unwrap()
                .flamegraph_with_options(flamegraph_file, &mut options)
                .expect("Error writing flamegraph");
        }
    }
}