1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// This is an example of using composite units
// It makes successive downloads of the linux source code
// and reports the download speed as well as the download time
package main
import (
"io"
"log"
"net/http"
"github.com/performancecopilot/speed/v4"
)
type sink int
func (s sink) Write(data []byte) (int, error) {
return len(data), nil
}
const url = "https://codeload.github.com/suyash/ulid/zip/master"
func main() {
client, err := speed.NewPCPClient("download")
if err != nil {
log.Fatal(err)
}
downloadSpeed, err := speed.NewPCPSingletonMetric(
float64(0),
"download_speed",
speed.DoubleType,
speed.InstantSemantics,
speed.MegabyteUnit.Time(speed.SecondUnit, -1),
)
if err != nil {
log.Fatal(err)
}
timer, err := speed.NewPCPTimer("download_time", speed.SecondUnit)
if err != nil {
log.Fatal(err)
}
client.MustRegister(timer)
client.MustRegister(downloadSpeed)
client.MustStart()
defer client.MustStop()
for {
timer.Reset()
run(timer, downloadSpeed)
}
}
func run(timer *speed.PCPTimer, downloadSpeed *speed.PCPSingletonMetric) {
res, err := http.Get(url)
if err != nil {
log.Fatal(err)
}
defer res.Body.Close()
var s sink
err = timer.Start()
if err != nil {
log.Fatal(err)
}
n, err := io.Copy(s, res.Body)
if err != nil {
log.Fatal(err)
}
elapsed, err := timer.Stop()
if err != nil {
log.Fatal(err)
}
downloadSpeed.Set(float64(n) / (1024 * 1024 * float64(elapsed)))
log.Println("downloaded", n, "bytes in", elapsed, "seconds")
}
|
