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v/vlib/benchmark/benchmark.v
2020-02-28 14:05:20 +01:00

189 lines
4.5 KiB
V

module benchmark
import time
import term
/*
Example usage of this module:
```
import benchmark
mut bmark := benchmark.new_benchmark()
// by default the benchmark will be verbose, i.e. it will include timing information
// if you want it to be silent, set bmark.verbose = false
for {
bmark.step() // call this when you want to advance the benchmark.
// The timing info in bmark.step_message will be measured starting from the last call to bmark.step
....
//bmark.fail() // call this if the step failed
//bmark.step_message(('failed')
bmark.ok() // call this when the step succeeded
println( bmark.step_message('ok')
}
bmark.stop() // call when you want to finalize the benchmark
println( bmark.total_message('remarks about the benchmark') )
```
benchmark.start() and b.measure() are convenience methods,
intended to be used in combination. Their goal is to make
benchmarking of small snippets of code as *short*, easy to
write, and then to read and analyze the results, as possible.
Example:
```v
import benchmark
b := benchmark.start()
// your code 1 ...
b.measure('code_1')
// your code 2 ...
b.measure('code_2')
```
... which will produce on stdout something like this:
SPENT 17 ms in code_1
SPENT 462 ms in code_2
*/
const (
BOK = term.ok_message('OK')
BFAIL = term.fail_message('FAIL')
BSPENT = term.ok_message('SPENT')
)
pub struct Benchmark {
pub mut:
bench_start_time i64
bench_end_time i64
step_start_time i64
step_end_time i64
ntotal int
nok int
nfail int
verbose bool
nexpected_steps int
cstep int
bok string
bfail string
}
pub fn new_benchmark() Benchmark {
return Benchmark{
bench_start_time: benchmark.now()
verbose: true
}
}
pub fn (b mut Benchmark) set_total_expected_steps(n int) {
b.nexpected_steps = n
}
pub fn (b mut Benchmark) stop() {
b.bench_end_time = benchmark.now()
}
pub fn (b mut Benchmark) step() {
b.step_start_time = benchmark.now()
b.cstep++
}
pub fn (b mut Benchmark) fail() {
b.step_end_time = benchmark.now()
b.ntotal++
b.nfail++
}
pub fn (b mut Benchmark) ok() {
b.step_end_time = benchmark.now()
b.ntotal++
b.nok++
}
pub fn (b mut Benchmark) fail_many(n int) {
b.step_end_time = benchmark.now()
b.ntotal += n
b.nfail += n
}
pub fn (b mut Benchmark) ok_many(n int) {
b.step_end_time = benchmark.now()
b.ntotal += n
b.nok += n
}
pub fn (b mut Benchmark) neither_fail_nor_ok() {
b.step_end_time = benchmark.now()
}
pub fn start() Benchmark {
mut b := new_benchmark()
b.step()
return b
}
pub fn (b mut Benchmark) measure(label string) i64 {
b.ok()
res := b.step_end_time - b.step_start_time
println(b.step_message_with_label(BSPENT, 'in $label'))
b.step()
return res
}
pub fn (b &Benchmark) step_message_with_label(label string, msg string) string {
mut timed_line := ''
if b.nexpected_steps > 0 {
mut sprogress := ''
if b.nexpected_steps < 10 {
sprogress = '${b.cstep:1d}/${b.nexpected_steps:1d}'
}
if b.nexpected_steps >= 10 && b.nexpected_steps < 100 {
sprogress = '${b.cstep:2d}/${b.nexpected_steps:2d}'
}
if b.nexpected_steps >= 100 && b.nexpected_steps < 1000 {
sprogress = '${b.cstep:3d}/${b.nexpected_steps:3d}'
}
timed_line = b.tdiff_in_ms('[${sprogress}] $msg', b.step_start_time, b.step_end_time)
}
else {
timed_line = b.tdiff_in_ms(msg, b.step_start_time, b.step_end_time)
}
return '${label:-5s}${timed_line}'
}
pub fn (b &Benchmark) step_message(msg string) string {
return b.step_message_with_label('', msg)
}
pub fn (b &Benchmark) step_message_ok(msg string) string {
return b.step_message_with_label(BOK, msg)
}
pub fn (b &Benchmark) step_message_fail(msg string) string {
return b.step_message_with_label(BFAIL, msg)
}
pub fn (b &Benchmark) total_message(msg string) string {
mut tmsg := '${msg}\n ok, fail, total = ' + term.ok_message('${b.nok:5d}') + ', ' + if b.nfail > 0 { term.fail_message('${b.nfail:5d}') } else { '${b.nfail:5d}' } + ', ' + '${b.ntotal:5d}'
if b.verbose {
tmsg = '<=== total time spent $tmsg'
}
return ' ' + b.tdiff_in_ms(tmsg, b.bench_start_time, b.bench_end_time)
}
pub fn (b &Benchmark) total_duration() i64 {
return (b.bench_end_time - b.bench_start_time)
}
// //////////////////////////////////////////////////////////////////
fn (b &Benchmark) tdiff_in_ms(s string, sticks i64, eticks i64) string {
if b.verbose {
tdiff := (eticks - sticks)
return '${tdiff:6lld} ms $s'
}
return s
}
fn now() i64 {
return time.ticks()
}