module main import os import flag import time import term import math import scripting import v.util struct CmdResult { mut: runs int cmd string icmd int outputs []string oms map[string][]int summary map[string]Aints timings []int atiming Aints } struct Context { mut: count int series int warmup int show_help bool show_output bool fail_on_regress_percent int fail_on_maxtime int // in ms verbose bool commands []string results []CmdResult cline string // a terminal clearing line } struct Aints { values []int mut: imin int imax int average f64 stddev f64 } fn new_aints(vals []int) Aints { mut res := Aints{ values: vals } mut sum := i64(0) mut imin := math.max_i32 mut imax := -math.max_i32 for i in vals { sum += i if i < imin { imin = i } if i > imax { imax = i } } res.imin = imin res.imax = imax if vals.len > 0 { res.average = sum / f64(vals.len) } // mut devsum := f64(0.0) for i in vals { x := f64(i) - res.average devsum += (x * x) } res.stddev = math.sqrt(devsum / f64(vals.len)) return res } fn (a Aints) str() string { return util.bold('${a.average:9.3f}') + 'ms ± σ: ${a.stddev:-5.1f}ms, min … max: ${a.imin}ms … ${a.imax}ms' } const ( max_fail_percent = 100000 max_time = 60 * 1000 // ms performance_regression_label = 'Performance regression detected, failing since ' ) fn main() { mut context := Context{} context.parse_options() context.run() context.show_diff_summary() } fn (mut context Context) parse_options() { mut fp := flag.new_flag_parser(os.args) fp.application(os.file_name(os.executable())) fp.version('0.0.1') fp.description('Repeat command(s) and collect statistics. NB: you have to quote each command, if it contains spaces.') fp.arguments_description('CMD1 CMD2 ...') fp.skip_executable() fp.limit_free_args_to_at_least(1) context.count = fp.int('count', `c`, 10, 'Repetition count.') context.series = fp.int('series', `s`, 2, 'Series count. `-s 2 -c 4 a b` => aaaabbbbaaaabbbb, while `-s 3 -c 2 a b` => aabbaabbaabb.') context.warmup = fp.int('warmup', `w`, 2, 'Warmup runs. These are done *only at the start*, and are ignored.') context.show_help = fp.bool('help', `h`, false, 'Show this help screen.') context.show_output = fp.bool('output', `O`, false, 'Show command stdout/stderr in the progress indicator for each command. NB: slower, for verbose commands.') context.verbose = fp.bool('verbose', `v`, false, 'Be more verbose.') context.fail_on_maxtime = fp.int('max_time', `m`, max_time, 'Fail with exit code 2, when first cmd takes above M milliseconds (regression).') context.fail_on_regress_percent = fp.int('fail_percent', `f`, max_fail_percent, 'Fail with exit code 3, when first cmd is X% slower than the rest (regression).') if context.show_help { println(fp.usage()) exit(0) } if context.verbose { scripting.set_verbose(true) } context.commands = fp.finalize() or { eprintln('Error: ' + err) exit(1) } context.results = []CmdResult{len: context.commands.len, init: CmdResult{}} context.cline = '\r' + term.h_divider('') } fn (mut context Context) clear_line() { print(context.cline) } fn (mut context Context) run() { mut run_warmups := 0 for si in 1 .. context.series + 1 { for icmd, cmd in context.commands { mut runs := 0 mut duration := 0 mut sum := 0 mut oldres := '' println('Series: ${si:4}/${context.series:-4}, command: $cmd') if context.warmup > 0 && run_warmups < context.commands.len { for i in 1 .. context.warmup + 1 { print('\r warming up run: ${i:4}/${context.warmup:-4} for ${cmd:-50s} took ${duration:6} ms ...') mut sw := time.new_stopwatch({}) os.exec(cmd) or { continue } duration = int(sw.elapsed().milliseconds()) } run_warmups++ } context.clear_line() for i in 1 .. (context.count + 1) { avg := f64(sum) / f64(i) print('\rAverage: ${avg:9.3f}ms | run: ${i:4}/${context.count:-4} | took ${duration:6} ms') if context.show_output { print(' | result: ${oldres:s}') } mut sw := time.new_stopwatch({}) res := scripting.exec(cmd) or { continue } duration = int(sw.elapsed().milliseconds()) if res.exit_code != 0 { eprintln('${i:10} non 0 exit code for cmd: $cmd') continue } context.results[icmd].outputs << res.output.trim_right('\r\n').replace('\r\n', '\n').split('\n') context.results[icmd].timings << duration sum += duration runs++ oldres = res.output.replace('\n', ' ') } context.results[icmd].cmd = cmd context.results[icmd].icmd = icmd context.results[icmd].runs += runs context.results[icmd].atiming = new_aints(context.results[icmd].timings) context.clear_line() print('\r') mut m := map[string][]int{} for o in context.results[icmd].outputs { x := o.split(':') if x.len > 1 { k := x[0] v := x[1].trim_left(' ').int() m[k] << v } } mut summary := map[string]Aints{} for k, v in m { // show a temporary summary for the current series/cmd cycle s := new_aints(v) println(' $k: $s') summary[k] = s } // merge current raw results to the previous ones old_oms := context.results[icmd].oms mut new_oms := map[string][]int{} for k, v in m { if old_oms[k].len == 0 { new_oms[k] = v } else { new_oms[k] << old_oms[k] new_oms[k] << v } } context.results[icmd].oms = new_oms // println('') } } // create full summaries, taking account of all runs for icmd in 0 .. context.results.len { mut new_full_summary := map[string]Aints{} for k, v in context.results[icmd].oms { new_full_summary[k] = new_aints(v) } context.results[icmd].summary = new_full_summary } } fn (mut context Context) show_diff_summary() { context.results.sort_with_compare(fn (a &CmdResult, b &CmdResult) int { if a.atiming.average < b.atiming.average { return -1 } if a.atiming.average > b.atiming.average { return 1 } return 0 }) println('Summary (commands are ordered by ascending mean time), after $context.series series of $context.count repetitions:') base := context.results[0].atiming.average mut first_cmd_percentage := f64(100.0) for i, r in context.results { cpercent := (r.atiming.average / base) * 100 - 100 first_marker := if r.icmd == 0 { util.bold('>') } else { ' ' } if r.icmd == 0 { first_cmd_percentage = cpercent } println(' $first_marker${(i+1):3} | ${cpercent:6.1f}% slower | ${r.cmd:-55s} | $r.atiming') } $if debugcontext ? { println('context: $context') } if int(base) > context.fail_on_maxtime { print(performance_regression_label) println('average time: ${base:6.1f} ms > $context.fail_on_maxtime ms threshold.') exit(2) } if context.fail_on_regress_percent == max_fail_percent || context.results.len < 2 { return } fail_threshold_max := f64(context.fail_on_regress_percent) if first_cmd_percentage > fail_threshold_max { print(performance_regression_label) println('${first_cmd_percentage:5.1f}% > ${fail_threshold_max:5.1f}% threshold.') exit(3) } }