fix >5s quick mode crash, resolve #658 (#685)

Author: KonradHoeffner

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+ - Quick mode (--quick) no longer crashes with measured times over 5 seconds when --noplot is not active
+
 ## [0.5.0] - 2023-05-23
 
 ### Changed

src/routine.rs

@@ -103,7 +103,8 @@ pub(crate) trait Routine<M: Measurement, T: ?Sized> {
             // Early exit for extremely long running benchmarks:
             if time_start.elapsed() > maximum_bench_duration {
                 let iters = vec![n as f64, n as f64].into_boxed_slice();
-                let elapsed = vec![t_prev, t_prev].into_boxed_slice();
+                // prevent gnuplot bug when all values are equal
+                let elapsed = vec![t_prev, t_prev + 0.000001].into_boxed_slice();
                 return (ActualSamplingMode::Flat, iters, elapsed);
             }