Commit 496bd425 authored by Kirill Smelkov's avatar Kirill Smelkov

X add benchmark RTT over plain net.Conn with serveRecv-style RX handler

BenchmarkSyncChanRTT-4           5000000               350 ns/op
BenchmarkBufChanRTT-4            5000000               352 ns/op
BenchmarkBufChanAXRXRTT-4        3000000               407 ns/op
BenchmarkNetPipeRTT-4            2000000               938 ns/op
BenchmarkNetPipeRTTsr-4          1000000              1594 ns/op	<-- here
BenchmarkTCPlo-4                  300000              4814 ns/op
BenchmarkTCPlosr-4                100000             12261 ns/op	<-- here
BenchmarkLinkNetPipeRTT-4         500000              3017 ns/op
BenchmarkLinkTCPRTT-4             100000             15650 ns/op

the δ beetwen TCPlo + serveRecv style RX and full link over TCPlo is ~ 3μs.

-> need to find out why TCPlosr = TCPlo + 8μs
parent 68738036
...@@ -912,17 +912,60 @@ func BenchmarkBufChanAXRXRTT(b *testing.B) { ...@@ -912,17 +912,60 @@ func BenchmarkBufChanAXRXRTT(b *testing.B) {
// rtt over net.Conn Read/Write // rtt over net.Conn Read/Write
func benchmarkNetConnRTT(b *testing.B, c1, c2 net.Conn) { // if serveRecv=t - do RX path with additional serveRecv-style goroutine
func benchmarkNetConnRTT(b *testing.B, c1, c2 net.Conn, serveRecv bool) {
buf1 := make([]byte, 1) buf1 := make([]byte, 1)
buf2 := make([]byte, 1) buf2 := make([]byte, 1)
// make func to recv from c into buf via selected rx strategy
mkrecv := func(c net.Conn, buf []byte) func() (int, error) {
var recv func() (int, error)
if serveRecv {
type rx struct {
n int
erx error
}
rxq := make(chan rx)
go func() {
for {
n, erx := io.ReadFull(c, buf)
//fmt.Printf("(go) %p rx -> %v %v\n", c, n, erx)
rxq <- rx{n, erx}
// stop on first error
if erx != nil {
return
}
}
}()
recv = func() (int, error) {
r := <-rxq
return r.n, r.erx
}
} else {
recv = func() (int, error) {
return io.ReadFull(c, buf)
}
}
return recv
}
recv1 := mkrecv(c1, buf1)
recv2 := mkrecv(c2, buf2)
b.ResetTimer() b.ResetTimer()
go func() { go func() {
defer xclose(c2) defer func() {
//fmt.Printf("2: close\n")
xclose(c2)
}()
for { for {
n, erx := io.ReadFull(c2, buf2) n, erx := recv2()
//fmt.Printf("2: rx %q\n", buf2[:n]) //fmt.Printf("2: rx %q\n", buf2[:n])
if n > 0 { if n > 0 {
if n != len(buf2) { if n != len(buf2) {
...@@ -958,7 +1001,7 @@ func benchmarkNetConnRTT(b *testing.B, c1, c2 net.Conn) { ...@@ -958,7 +1001,7 @@ func benchmarkNetConnRTT(b *testing.B, c1, c2 net.Conn) {
b.Fatal(err) b.Fatal(err)
} }
n, err := io.ReadFull(c1, buf1) n, err := recv1()
//fmt.Printf("1: rx %q\n", buf1[:n]) //fmt.Printf("1: rx %q\n", buf1[:n])
if !(n == len(buf1) && err == nil) { if !(n == len(buf1) && err == nil) {
b.Fatalf("read back: n=%v err=%v", n, err) b.Fatalf("read back: n=%v err=%v", n, err)
...@@ -969,13 +1012,19 @@ func benchmarkNetConnRTT(b *testing.B, c1, c2 net.Conn) { ...@@ -969,13 +1012,19 @@ func benchmarkNetConnRTT(b *testing.B, c1, c2 net.Conn) {
} }
} }
//fmt.Printf("1: close\n")
xclose(c1) xclose(c1)
} }
// rtt over net.Pipe - for comparision as base // rtt over net.Pipe - for comparision as base
func BenchmarkNetPipeRTT(b *testing.B) { func BenchmarkNetPipeRTT(b *testing.B) {
c1, c2 := net.Pipe() c1, c2 := net.Pipe()
benchmarkNetConnRTT(b, c1, c2) benchmarkNetConnRTT(b, c1, c2, false)
}
func BenchmarkNetPipeRTTsr(b *testing.B) {
c1, c2 := net.Pipe()
benchmarkNetConnRTT(b, c1, c2, true)
} }
// xtcpPipe creates two TCP connections connected to each other via loopback // xtcpPipe creates two TCP connections connected to each other via loopback
...@@ -995,9 +1044,14 @@ func xtcpPipe() (*net.TCPConn, *net.TCPConn) { ...@@ -995,9 +1044,14 @@ func xtcpPipe() (*net.TCPConn, *net.TCPConn) {
} }
// rtt over TCP/loopback - for comparision as base // rtt over TCP/loopback - for comparision as base
func BenchmarkTCPloopback(b *testing.B) { func BenchmarkTCPlo(b *testing.B) {
c1, c2 := xtcpPipe()
benchmarkNetConnRTT(b, c1, c2, false)
}
func BenchmarkTCPlosr(b *testing.B) {
c1, c2 := xtcpPipe() c1, c2 := xtcpPipe()
benchmarkNetConnRTT(b, c1, c2) benchmarkNetConnRTT(b, c1, c2, true)
} }
......
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