Clean between runs in the make parameter-scan example

doc/hyperfine.1

@@ -141,7 +141,7 @@ string '{\fIVAR\fP}' in each command by the current parameter value.
 .RS
 Example:
 .RS
-\fBhyperfine\fR \fB\-P\fR threads 1 8 'make \-j {threads}'
+\fBhyperfine\fR \fB\-\-prepare\fR 'make clean' \fB\-P\fR threads 1 8 'make \-j {threads}'
 .RE
 .RE
 .IP

scripts/README.md

@@ -4,14 +4,23 @@ This folder contains scripts that can be used in combination with hyperfines `--
 
 ```bash
 hyperfine 'sleep 0.020' 'sleep 0.021' 'sleep 0.022' --export-json sleep.json
-uv run plot_whisker.py sleep.json
+./plot_whisker.py sleep.json
 ```
 
 ### Pre-requisites
 
-Install [`uv`](https://docs.astral.sh/uv/getting-started/installation/) and run the
-commands above from this directory.
+To make these scripts work, you will need `numpy`, `matplotlib` and `scipy`.
 
-The scripts declare their dependencies using [PEP 723](https://peps.python.org/pep-0723/)
-inline script metadata. `uv run` automatically installs these dependencies in an
-isolated environment before running the script.
+If you have a Python package manager that understands [PEP-723](https://peps.python.org/pep-0723/)
+inline script requirements like [`uv`](https://github.com/astral-sh/uv) or [`pipx`](https://github.com/pypa/pipx),
+you can directly run the scripts using
+
+```bash
+uv run plot_whisker.py sleep.json
+```
+
+Otherwise, install the dependencies via your system package manager or using `pip`:
+
+```bash
+pip install numpy matplotlib scipy  # pip3, if you are using python3
+```

src/cli.rs

@@ -161,7 +161,7 @@ fn build_command() -> Command {
                 .help(
                     "Perform benchmark runs for each value in the range MIN..MAX. Replaces the \
                      string '{VAR}' in each command by the current parameter value.\n\n  \
-                     Example:  hyperfine -P threads 1 8 'make -j {threads}'\n\n\
+                     Example:  hyperfine --prepare 'make clean' -P threads 1 8 'make -j {threads}'\n\n\
                      This performs benchmarks for 'make -j 1', 'make -j 2', …, 'make -j 8'.\n\n\
                      To have the value increase following different patterns, use shell arithmetics.\n\n  \
                      Example: hyperfine -P size 0 3 'sleep $((2**{size}))'\n\n\