Hello,
I'm trying to understand whether net.Conn.Read() is expected to use a lot
more CPU than reading using the lower level socket interface or if I am
doing something wrong(or perhaps comparing apples to oranges)?
Consumer and producer apps are running on two different Linux machines, in
"top" the net.Conn.Read() app is showing 20-30% higher CPU than the app
using Recvfrom()
Thanks
Anton
*producer.go*
import "net"
func main() {
l, _ := net.Listen("tcp", "192.168.1.7:3333")
conn, _ := l.Accept()
for {
conn.Write([]byte("abcdefgh"))
}
}
*consumer_recvfrom.go*
import (
"golang.org/x/sys/unix"
"net"
)
func main() {
var addr [4]byte
copy(addr[:], net.ParseIP("192.168.1.7").To4())
fd, _ := unix.Socket(unix.AF_INET, unix.SOCK_STREAM, 0)
unix.Connect(fd, &unix.SockaddrInet4{Port: 3333, Addr: addr})
b := make([]byte, 65536, 65536)
for {
unix.Recvfrom(fd, b, 0)
}
}
*consumer_netread.go*
import "net"
func main() {
conn, _ := net.Dial("tcp", "192.168.1.7:3333")
b := make([]byte, 65536, 65536)
for {
conn.Read(b)
}
}
*consumer_recvfrom:*
$ vmstat 10 10
procs -----------memory---------- ---swap-- -----io---- -system--
------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id
wa st
3 0 864 1568372 332 2072064 0 0 0 0 2 1 0 0
100 0 0
0 0 864 1568616 332 2071980 0 0 0 0 14950 10844 0 9
91 0 0
0 0 864 1568832 332 2071976 0 0 0 0 14307 12735 0 8
92 0 0
0 0 864 1568616 332 2071976 0 0 0 0 15106 10634 0 9
90 0 0
0 0 864 1568708 332 2071980 0 0 0 0 15214 10839 0 9
90 0 0
1 0 864 1568900 332 2071880 0 0 0 0 15466 13163 0 8
91 0 0
0 0 864 1568572 332 2072116 0 0 0 0 14579 11268 0 9
91 0 0
1 0 864 1568788 332 2071992 0 0 0 0 15278 11370 0 9
91 0 0
1 0 864 1568884 332 2071912 0 0 0 0 16468 11986 0 9
91 0 0
1 0 864 1568756 332 2071880 0 0 0 0 15769 11242 0 9
90 0 0
TX eth0: 126469 pkts/10s RX eth0: 558847 pkts/10s
TX eth0: 127229 pkts/10s RX eth0: 530672 pkts/10s
TX eth0: 113907 pkts/10s RX eth0: 572163 pkts/10s
TX eth0: 114638 pkts/10s RX eth0: 519287 pkts/10s
TX eth0: 119010 pkts/10s RX eth0: 553152 pkts/10s
*consumer_netread:*
$ vmstat 10 10
procs -----------memory---------- ---swap-- -----io---- -system--
------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id
wa st
2 0 864 1570996 332 2071956 0 0 0 0 2 2 0 0
100 0 0
1 0 864 1571004 332 2072132 0 0 0 0 28082 32770 2 12
86 0 0
2 0 864 1571108 332 2071924 0 0 0 0 28370 29395 2 12
86 0 0
2 0 864 1571808 332 2071924 0 0 0 0 28847 29513 2 12
86 0 0
2 0 864 1571196 332 2071892 0 0 0 0 28499 31063 2 13
86 0 0
1 0 864 1571136 332 2071892 0 0 0 0 30216 33711 2 12
86 0 0
2 0 864 1570920 332 2071892 0 0 0 0 28224 30675 2 12
86 0 1
2 0 864 1570860 332 2071892 0 0 0 0 26453 29701 2 12
86 0 0
1 0 864 1571112 332 2071892 0 0 0 0 26917 29510 2 12
86 0 0
0 0 864 1571128 332 2071892 0 0 0 0 27030 29683 2 13
86 0 0
TX eth0: 80310 pkts/10s RX eth0: 584112 pkts/10s
TX eth0: 88469 pkts/10s RX eth0: 512453 pkts/10s
TX eth0: 89665 pkts/10s RX eth0: 512174 pkts/10s
TX eth0: 84497 pkts/10s RX eth0: 480085 pkts/10s
TX eth0: 92261 pkts/10s RX eth0: 540044 pkts/10s
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