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Adds tip for benchmarking aliases and functions

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Thiago Arrais 2020-10-19 13:17:24 -03:00 committed by David Peter
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@ -40,6 +40,26 @@ option:
hyperfine --min-runs 5 'sleep 0.2' 'sleep 3.2'
```
### Tip: aliases and functions
Aliases and shell functions can't be benchmarked directly, but you may try to put them in a separate
file and benchmark _that_:
```bash
echo 'my_function() { sleep 1 }' > /tmp/my_function.sh
echo 'alias my_alias="sleep 1"' > /tmp/my_alias.sh
hyperfine 'source /tmp/my_function.sh; eval my_function'
hyperfine 'source /tmp/my_alias.sh; eval my_alias'
```
If you're using bash, you may also want to `export` functions (can't do that with aliases, though):
```
$ my_function() { sleep 1; }
$ export -f my_function
$ hyperfine my_function
```
### Warmup runs and preparation commands
If the program execution time is limited by disk I/O, the benchmarking results can be heavily