fixup: remove rayon from statistics functions since it has an overhead

Author: not-matthias

go-runner/src/results/walltime_results.rs

@@ -1,7 +1,6 @@
 // NOTE: This file was taken from `codspeed-rust` and modified a bit to fit this project.
 
 use anyhow::Result;
-use rayon::prelude::*;
 use serde::{Deserialize, Serialize};
 use statrs::statistics::{Data, Distribution, Max, Min, OrderStatistics};
 
@@ -58,13 +57,10 @@ impl WalltimeBenchmark {
         times_per_round_ns: &[u64],
         max_time_ns: Option<u128>,
     ) -> Self {
-        let total_time = times_per_round_ns
-            .par_iter()
-            .map(|&t| t as u128)
-            .sum::<u128>() as f64
-            / 1_000_000_000.0;
+        let total_time =
+            times_per_round_ns.iter().map(|&t| t as u128).sum::<u128>() as f64 / 1_000_000_000.0;
         let time_per_iteration_per_round_ns: Vec<_> = times_per_round_ns
-            .par_iter()
+            .iter()
             .zip(iters_per_round)
             .map(|(time_per_round, iter_per_round)| {
                 *time_per_round as u128 / *iter_per_round as u128
@@ -92,15 +88,13 @@ impl WalltimeBenchmark {
         let iqr_ns = q3_ns - q1_ns;
         let iqr_outlier_rounds = data
             .iter()
-            .par_bridge()
             .filter(|&&t| {
                 t < q1_ns - IQR_OUTLIER_FACTOR * iqr_ns || t > q3_ns + IQR_OUTLIER_FACTOR * iqr_ns
             })
             .count() as u64;
 
         let stdev_outlier_rounds = data
             .iter()
-            .par_bridge()
             .filter(|&&t| {
                 t < mean_ns - STDEV_OUTLIER_FACTOR * stdev_ns
                     || t > mean_ns + STDEV_OUTLIER_FACTOR * stdev_ns
@@ -111,7 +105,7 @@ impl WalltimeBenchmark {
         let max_ns = data.max();
 
         // TODO(COD-1056): We currently only support single iteration count per round
-        let iter_per_round = (iters_per_round.par_iter().map(|&t| t as u128).sum::<u128>()
+        let iter_per_round = (iters_per_round.iter().map(|&t| t as u128).sum::<u128>()
             / iters_per_round.len() as u128) as u64;
         let warmup_iters = 0; // FIXME: add warmup detection