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pt&Goroutines
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monochromegane
May 31, 2014
Technology
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pt&Goroutines
pt(the_platinum_searcher) を高速化するために Goroutines まわりで試したことを発表しました。
http://connpass.com/event/6370/
monochromegane
May 31, 2014
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Transcript
pt &Goroutine - GoCon 2014 spring -
MIYAKE Yusuke (@monochromegane)
GMO Pepabo, Inc.
grep ͯ͠·͔͢ʁ
grep?
ack?
ag?
pt The Platinum Searcher
Written in Golang
Mac OSX Linux Windows
UTF-8 EUC-JP Shift-JIS
AND
fast ! ack go 6.24s user 1.06s system 99% cpu
7.304 total # ack ag go 0.88s user 1.39s system 221% cpu 1.027 total # ag pt go 1.09s user 1.01s system 235% cpu 0.892 total # pt
How?
Goroutine & Channel
͍ͬ͠ΐʹߴԽͯ͠Έ·͠ΐ͏
1. ϑΝΠϧΛݕࡧͯ͠(find) 2. จࣈྻΛݕࡧͯ͠(grep) 3. ݁ՌΛදࣔ͢Δ(print) ύλʔϯݕࡧͱ
Approach-0 ! ॱ൪ʹ
find
find grep
find grep print
// find find := find.Find{Option: self.Option} find.Do(self.Root) ! // grep
grep := grep.Grep{ Files: find.Files, // result Pattern: self.Pattern, Option: self.Option} grep.Do() ! // print print := print.Print{ Matches: grep.Matches, // result Pattern: self.Pattern, Option: self.Option} print.Do()
> the_simple_searcher go $GOROOT > /dev/null
0.79 seconds
Approach-1 ! ฒߦʹ
Goroutine
• GoݴޠͰฒߦॲཧΛ࣮ݱ͢Δ • εϨουɺίϧʔνϯͱҧ͏ • Concurrency(ฒߦ)ͱParallelism(ฒྻ) • ܰྔ • go
f()
find grep print go go go
Channel
• Goroutineؒͷϝοηʔδϯά • ͷૹड৴ • όοϑΝʹΑΔϒϩοΫ
find grep print go go go
$IBOFM find grep print $IBOFM go go go
$IBOFM find grep print $IBOFM go go go
// channel files := make(chan *string, self.Option.Cap) matches := make(chan
*grep.Match, self.Option.Cap) done := make(chan bool) ! // find find := find.Find{Files: files, Option: self.Option} go find.Do(self.Root) ! // grep grep := grep.Grep{ Files: files, Matches: matches, Pattern: self.Pattern, Option: self.Option} go grep.Do() ! // print print := print.Print{ Done: done, Matches: matches, Pattern: self.Pattern, Option: self.Option} go print.Do() ! <-done // block
walkFunc := func(path string, info os.FileInfo, err error) error {
if info.IsDir() { return nil } self.Files <- &path // send return nil } ! filepath.Walk(root, walkFunc) close(self.Files) // close
for file := range self.Files { // receive ( <-self.Files
) fh, err := os.Open(*file) if err != nil { panic(err) } ! f := bufio.NewReader(fh) ! var buf []byte var lineNum = 1 for { buf, _, err = f.ReadLine() if err != nil { break } line := string(buf) if strings.Contains(line, self.Pattern) { self.Matches <- &Match{*file, lineNum, line} // send } lineNum++ } fh.Close() } close(self.Matches) // close
for match := range self.Matches { // receive fmt.Printf("%s:%d:%s\n", match.Path,
match.Num, match.Match) } self.Done <- true // send
> the_simple_searcher go $GOROOT > /dev/null
0.79 -> 0.87 seconds
?
buffer
• Channelͷड༰ྔ • ch := make(chan ܕ, ༰ྔ) • ༰ྔ·Ͱड
• ༰ྔ͑Δͱૹ৴ଆडͪ • ड৴͢Δͱ༰ྔ͕ͻͱۭͭ͘ • ༰ྔ͕0ͷ߹ɺৗʹͭ
// channel with buffer files := make(chan *string, self.Option.Cap) matches
:= make(chan *grep.Match, self.Option.Cap) done := make(chan bool) // always wait
> the_simple_searcher go $GOROOT > /dev/null
0.79 -> 0.8 seconds
Approach-2 ! ͬͱฒߦʹ
$IBOFM find grep print $IBOFM go go go
$IBOFM find grep print $IBOFM go go go grep grep
grep
var wg sync.WaitGroup for file := range self.Files { wg.Add(1)
// goroutineͷىಈΛΠϯΫϦϝϯτ (தུ) go func(self *Grep, file *string) { defer wg.Done() // goroutine͕ྃͨ͠ΒىಈΛσΫϦϝϯτ for { ɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹ(தུ) } fh.Close() ! }(self, file) // ΫϩʔδϟΛgoroutineʹ͢Δͱ͖มͷڞ༗ʹҙ ! } wg.Wait() // ෆಛఆͷgoroutine͕શͯऴྃ͢ΔͷΛͭ close(self.Matches)
> the_simple_searcher go $GOROOT > /dev/null
panic ! too many open files
var wg sync.WaitGroup sem := make(chan bool, self.Option.Cap) // ىಈ͢ΔgoroutineͷΛ੍ޚ͢Δchannel
for file := range self.Files { sem <- true // goroutineͷىಈ(channelͷbuffer)͕͍ͬͺ͍ͳΒͭ wg.Add(1) (தུ) go func(self *Grep, file *string) { defer wg.Done() for { ɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹ(தུ) } fh.Close() <-sem // ಉ࣌ىಈchannelͷbufferʹۭ͖Λͭ͘Δ ! }(self, file) ! } wg.Wait() close(self.Matches)
> the_simple_searcher go $GOROOT > /dev/null
0.79 -> 0.8 seconds
Approach-3 ! ฒྻʹ
GOMAXPROCS
• Goroutineͷฒྻ • σϑΥϧτ1 • runtime.NumCPU()ͰίΞΛऔಘ • runtime.GOMAXPROCS()ͰฒྻΛઃఆ
> the_simple_searcher go $GOROOT > /dev/null
0.79 -> 0.55 ! seconds
benchmark ! • Mac OSX(10.9.3) • CPU: 2.5GHz Core i5(2Core)
• Memory: 8GB • Go: 1.2.2
#V⒎FS (0."9130$4 "QQSPBDI
ฒߦԽͯ͠ͳ͍ͷͰ ฒྻԽͯ͠มΘΒͣ ίΞҎ্ͷࢦఆ ޮՌͳ͠ ଌఆͯ͠ௐ͠ͳ͍ͱ ߹ʹΑͬͯ͘ͳΔ #V⒎FS (0."9130$4 "QQSPBDI
–Rob Pike • Concurrency is powerful. • Concurrency is not
parallelism. • Concurrency enables parallelism. • Concurrency makes parallelism (and scaling and everything else) easy.
એ ϖύϘͰΤϯδχΞΛืू͍ͯ͠·͢ɻ ڞʹαʔϏεΛੜΈग़͠ҭͯͯ͘ΕΔ৽͍ؒ͠ Λ͍ͬͯ·͢ɻ ! http://pepabo.com/recruit/career/engineer/
͓ΘΓ