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package main
import (
"fmt"
"net/http"
_ "net/http/pprof"
"runtime/causalprof"
"sync"
"math/rand"
)
func main() {
http.HandleFunc("/", foo)
http.ListenAndServe("localhost:8080", nil)
}
var m sync.RWMutex
func foo(rw http.ResponseWriter, req *http.Request) {
p := causalprof.StartProgress()
m.RLock()
fmt.Fprintln(rw, "whatup")
m.RUnlock()
p.Stop()
if rand.Intn(100) == 0 {
m.Lock()
ch := make(chan int, 1)
go func() {
bar()
ch <- 1
}()
<-ch
m.Unlock()
}
}
func bar() {
for i := 0; i < 100000000; i++ {}
}
// gotip run $%
0x47b245 /home/daniel/go/src/syscall/zsyscall_linux_amd64.go:1029
0% 30577668ns
30% 31514493ns +3.06%
0x653334 /home/daniel/go/src/net/http/header.go:46
no null experiment, skip
0x434ab7 /home/daniel/go/src/runtime/proc.go:2329
0% 30999084ns
0x44b722 /home/daniel/go/src/runtime/symtab.go:726
0% 31455962ns
0x41e494 /home/daniel/go/src/runtime/mgcmark.go:779
no null experiment, skip
0x440384 /home/daniel/go/src/runtime/sema.go:66
0% 31383410ns
0x65500b /home/daniel/go/src/net/http/server.go:364
no null experiment, skip
0x65db09 /home/daniel/go/src/net/http/server.go:2172
0% 24921347ns
0x6e3162 /home/daniel/src/github.com/DanielMorsing/test/foobar.go:29
0% 24486960ns
5% 26024808ns +6.28%
10% 28369246ns +15.9%
15% 26537050ns +8.37%
20% 21538955ns -12%
25% 21108880ns -13.8%
30% 19283509ns -21.2%
35% 17088468ns -30.2%
40% 17652392ns -27.9%
45% 12271748ns -49.9%
50% 14961467ns -38.9%
55% 11343666ns -53.7%
60% 11790047ns -51.9%
65% 13001082ns -46.9%
70% 9152066ns -62.6%
75% 7430681ns -69.7%
80% 7925614ns -67.6%
85% 7325838ns -70.1%
90% 4147780ns -83.1%
95% 3696183ns -84.9%
100% 54509441ns +123%
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