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v/cmd/tools/fast/fast.v

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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import os
import time
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fn main() {
exe := os.executable()
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dir := os.dir(exe)
vdir := os.dir(os.dir(os.dir(dir)))
if !os.exists('$vdir/v') && !os.is_dir('$vdir/vlib') {
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println('fast.html generator needs to be located in `v/cmd/tools/fast`')
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}
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println('fast.html generator\n')
// Fetch the last commit's hash
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println('Fetching updates...')
ret := os.system('$vdir/v up')
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if ret != 0 {
println('failed to update V')
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return
}
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mut commit_hash := exec('git rev-parse HEAD')
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commit_hash = commit_hash[..8]
if os.exists('last_commit.txt') {
last_commit := os.read_file('last_commit.txt') ?
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if last_commit.trim_space() == commit_hash.trim_space() {
println('No new commits to benchmark. Commit $commit_hash has already been processed.')
return
}
commit_hash = last_commit.trim_space()
}
if !os.exists('table.html') {
os.create('table.html') ?
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}
mut table := os.read_file('table.html') ?
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/*
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// Do nothing if it's already been processed.
if table.contains(commit_hash) {
println('Commit $commit_hash has already been processed')
return
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}
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*/
last_commits := exec('git log --pretty=format:"%h" -n 50').split('\n')
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// Fetch all unprocessed commits (commits after the last processed commit)
mut commits := []string{}
println('!last_commit="$commit_hash"')
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for i, c in last_commits {
if c == commit_hash {
commits = last_commits[..i].reverse()
break
}
}
println(last_commits)
println('Commits to benchmark:')
println(commits)
for i, commit in commits {
message := exec('git log --pretty=format:"%s" -n1 $commit')
println('\n${i + 1}/$commits.len Benchmarking commit $commit "$message"')
// Build an optimized V
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println('Checking out ${commit}...')
exec('git checkout $commit')
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println(' Building vprod...')
exec('v -o $vdir/vprod -prod $vdir/cmd/v')
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diff1 := measure('$vdir/vprod -cc clang -o v.c $vdir/cmd/v', 'v.c')
diff2 := measure('$vdir/vprod -cc clang -o v2 $vdir/cmd/v', 'v2')
diff3 := measure('$vdir/vprod -x64 $vdir/cmd/tools/1mil.v', 'x64 1mil')
diff4 := measure('$vdir/vprod -cc clang $vdir/examples/hello_world.v', 'hello.v')
// println('Building V took ${diff}ms')
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commit_date := exec('git log -n1 --pretty="format:%at" $commit')
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date := time.unix(commit_date.int())
mut out := os.create('table.html') ?
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// Place the new row on top
table =
'<tr>
<td>$date.format()</td>
<td><a target=_blank href="https://github.com/vlang/v/commit/$commit">$commit</a></td>
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<td>$message</td>
<td>${diff1}ms</td>
<td>${diff2}ms</td>
<td>${diff3}ms</td>
<td>${diff4}ms</td>
</tr>\n' +
table.trim_space()
out.writeln(table) ?
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out.close()
// Regenerate index.html
header := os.read_file('header.html') ?
footer := os.read_file('footer.html') ?
mut res := os.create('index.html') ?
res.writeln(header) ?
res.writeln(table) ?
res.writeln(footer) ?
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res.close()
}
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exec('git checkout master')
os.write_file('last_commit.txt', commits[commits.len - 1]) ?
}
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fn exec(s string) string {
e := os.exec(s) or { panic(err) }
return e.output.trim_right('\r\n')
}
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// returns milliseconds
fn measure(cmd string, description string) int {
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println(' Measuring $description')
println(' Warming up...')
for _ in 0 .. 3 {
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exec(cmd)
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}
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println(' Building...')
mut runs := []int{}
for r in 0 .. 5 {
println(' Sample ${r + 1}/5')
sw := time.new_stopwatch({})
exec(cmd)
runs << int(sw.elapsed().milliseconds())
}
// discard lowest and highest time
runs.sort()
runs = runs[1..4]
mut sum := 0
for run in runs {
sum += run
}
return int(sum / 3)
}