Created
March 13, 2019 17:46
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Go 1.12 network slowdown on Darwin
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package main | |
import ( | |
"fmt" | |
"io" | |
"log" | |
"net" | |
"os" | |
"sync" | |
"sync/atomic" | |
"time" | |
) | |
func main() { | |
switch { | |
case len(os.Args) > 1 && os.Args[1] == "bench": | |
bench() | |
case len(os.Args) > 1 && os.Args[1] == "server": | |
server() | |
default: | |
fmt.Fprintf(os.Stderr, "usage: <command> server|bench\n") | |
os.Exit(1) | |
} | |
} | |
func server() { | |
log.Printf("echo server started\n") | |
os.RemoveAll("socket") | |
ln, err := net.Listen("unix", "socket") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer ln.Close() | |
for { | |
conn, err := ln.Accept() | |
if err != nil { | |
log.Fatal(err) | |
} | |
go func(conn net.Conn) { | |
defer conn.Close() | |
var packet [256]byte | |
for { | |
n, err := conn.Read(packet[:]) | |
if err != nil { | |
return | |
} | |
conn.Write(packet[:n]) | |
} | |
}(conn) | |
} | |
} | |
func bench() { | |
c := 50 | |
n := 100000 | |
log.Printf("echo benchmark connecting %d clients\n", c) | |
start := time.Now() | |
var total int32 | |
var wg sync.WaitGroup | |
wg.Add(c) | |
for i := 0; i < c; i++ { | |
go func() { | |
defer wg.Done() | |
conn, err := net.Dial("unix", "socket") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer conn.Close() | |
packet := []byte("ping\n") | |
for i := 0; i < n/c; i++ { | |
conn.Write(packet) | |
if _, err := io.ReadFull(conn, packet); err != nil { | |
log.Fatal(err) | |
} | |
if atomic.AddInt32(&total, 1)%3131 == 0 { | |
fmt.Printf("\r%.0f ops/sec ", | |
float64(total)/time.Since(start).Seconds()) | |
} | |
} | |
}() | |
} | |
wg.Wait() | |
fmt.Printf("\r%.0f ops/sec\n", | |
float64(total)/time.Since(start).Seconds()) | |
} |
Still continue in 1.12.5
go 1.11 darwin 268.093 ops/sec
go 1.12.5 darwin 71.273 ops/sec
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Have same issue
Looks like in 1.12.4 runtime spent much time to scheduling and less for networking
top20 from pprof for 1.11.5
same for 1.12.4