An implementation of Unix dc and POSIX bc with GNU and BSD extensions
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3 years ago
# Benchmarks
These are the results of benchmarks comparing this `bc` (at version `2.0.0`) and
GNU `bc` (at version `1.07.1`).
Note: all benchmarks were run four time, and the fastest run is the one shown.
Also, `[bc]` means whichever `bc` was being run, and the assumed working
directory is the root directory of this repository. Also, this `bc` was built at
`-O2`.
### Addition
The command used was:
```
tests/script bc add.bc 0 1 1 [bc]
```
For GNU `bc`:
```
Running bc script: add.bc
real 2.08
user 1.01
sys 1.06
3 years ago
```
For this `bc`:
```
Running bc script: add.bc
real 1.29
user 1.24
sys 0.04
3 years ago
```
### Subtraction
The command used was:
```
tests/script bc subtract.bc 0 1 1 [bc]
```
For GNU `bc`:
```
Running bc script: subtract.bc
real 2.12
user 1.12
sys 1.00
3 years ago
```
For this `bc`:
```
Running bc script: subtract.bc
real 1.33
user 1.31
sys 0.02
3 years ago
```
### Multiplication
The command used was:
```
tests/script bc multiply.bc 0 1 1 [bc]
```
For GNU `bc`:
```
Running bc script: multiply.bc
real 5.74
user 3.95
sys 1.79
```
For this `bc`:
```
Running bc script: multiply.bc
real 2.59
user 2.55
sys 0.03
```
### Division
The command used was:
```
tests/script bc divide.bc 0 1 1 [bc]
```
For GNU `bc`:
```
Running bc script: divide.bc
real 2.89
user 1.62
sys 1.26
```
For this `bc`:
```
Running bc script: divide.bc
real 2.24
user 2.22
sys 0.01
```
### Power
The command used was:
```
printf '1234567890^100000; halt\n' | time -p [bc] -lq > /dev/null
```
For GNU `bc`:
```
real 12.08
user 12.08
sys 0.00
```
For this `bc`:
```
real 0.81
user 0.81
sys 0.00
```
### Scripts
A script was created that contained the following:
```
#!/bin/sh
exe="$1"
for i in $(seq 0 1000); do
printf '%d\n' "$i" | "$exe" -q tests/bc/scripts/timeconst.bc > /dev/null
done
```
where `tests/bc/scripts/timeconst.bc` is [this file][1]. The script was saved at
`../test.sh`.
The command used was:
```
time -p sh ../test.sh [bc]
```
For GNU `bc`:
```
real 0.92
user 0.85
sys 0.17
```
For this `bc`:
```
real 1.01
user 0.96
sys 0.15
```
[1]: https://github.com/torvalds/linux/blob/master/kernel/time/timeconst.bc