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docs: make benchmark commands non-destructive and preserve captures #355

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28 changes: 8 additions & 20 deletions README.md
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Expand Up @@ -46,40 +46,28 @@ In place modification of files:

## Benchmarks

**Simple replacement on ~1.5 gigabytes of JSON**
The commands below assume GNU sed and a POSIX-compatible shell. `sd -p` writes
replacements to stdout without modifying the input files, so every run uses the
same input.

**Simple replacement across JSON files**

```sh
hyperfine --warmup 3 --export-markdown out.md \
'sed -E "s/\"/'"'"'/g" *.json > /dev/null' \
'sed "s/\"/'"'"'/g" *.json > /dev/null' \
'sd "\"" "'"'"'" *.json > /dev/null'
'sd -p "\"" "'"'"'" *.json > /dev/null'
```

| Command | Mean [s] | Min…Max [s] |
|:---|---:|---:|
| `sed -E "s/\"/'/g" *.json > /dev/null` | 2.338 ± 0.008 | 2.332…2.358 |
| `sed "s/\"/'/g" *.json > /dev/null` | 2.365 ± 0.009 | 2.351…2.378 |
| `sd "\"" "'" *.json > /dev/null` | **0.997 ± 0.006** | 0.987…1.007 |

Result: ~2.35 times faster

**Regex replacement on a ~55M json file**:
**Regex replacement in a JSON file**:

```sh
hyperfine --warmup 3 --export-markdown out.md \
'sed -E "s:(\w+):\1\1:g" dump.json > /dev/null' \
'sed "s:\(\w\+\):\1\1:g" dump.json > /dev/null' \
'sd "(\w+)" "$1$1" dump.json > /dev/null'
'sd -p "(\w+)" "\$1\$1" dump.json > /dev/null'
```

| Command | Mean [s] | Min…Max [s] |
|:---|---:|---:|
| `sed -E "s:(\w+):\1\1:g" dump.json > /dev/null` | 11.315 ± 0.215 | 11.102…11.725 |
| `sed "s:\(\w\+\):\1\1:g" dump.json > /dev/null` | 11.239 ± 0.208 | 11.057…11.762 |
| `sd "(\w+)" "$1$1" dump.json > /dev/null` | **0.942 ± 0.004** | 0.936…0.951 |

Result: ~11.93 times faster

**Line-by-line vs across mode** (1M lines, ~36MB file):

| Command | Mean [ms] | Relative |
Expand Down