Created
October 11, 2016 09:28
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package main | |
import ( | |
"net" | |
"net/http" | |
_ "net/http/pprof" | |
) | |
const host = "localhost:4242" | |
var sink int | |
// Takes a few ms CPU time | |
func doSomething() { | |
for i := 0; i < 1000000; i++ { | |
sink += i | |
} | |
} | |
// Opens a UDP listener and ignores any data | |
func udpSink() { | |
laddr, err := net.ResolveUDPAddr("udp", host) | |
if err != nil { | |
panic(err) | |
} | |
l, err := net.ListenUDP("udp", laddr) | |
if err != nil { | |
panic(err) | |
} | |
buf := make([]byte, 1000) | |
for { | |
_, _, err := l.ReadFromUDP(buf) | |
if err != nil { | |
panic(err) | |
} | |
} | |
} | |
func main() { | |
go http.ListenAndServe("localhost:8080", nil) | |
go udpSink() | |
addr, err := net.ResolveUDPAddr("udp", host) | |
if err != nil { | |
panic(err) | |
} | |
c, err := net.DialUDP("udp", nil, addr) | |
if err != nil { | |
panic(err) | |
} | |
buf := make([]byte, 1000) | |
for { | |
// First, send | |
_, err = c.Write(buf) | |
if err != nil { | |
panic(err) | |
} | |
// then, occupy CPU | |
doSomething() | |
} | |
} |
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