feat: remove existing pipedata file if there are any

Author: GuillaumeLagrange

src/run/runner/wall_time/perf/mod.rs

@@ -90,6 +90,13 @@ impl PerfRunner {
         bench_cmd: &str,
         config: &Config,
     ) -> anyhow::Result<ExitStatus> {
+        // Clean up any existing perf data file from previous runs
+        if Path::new(PERF_DATA_PATH).exists() {
+            std::fs::remove_file(PERF_DATA_PATH).with_context(|| {
+                format!("Failed to remove existing perf data file at {PERF_DATA_PATH}",)
+            })?;
+        }
+
         let perf_fifo = PerfFifo::new()?;
         let runner_fifo = RunnerFifo::new()?;