Using it within a goroutine can cause inaccurate delay measurements returned by the Time function.

[cloverkits]

Using it within a goroutine can cause inaccurate delay measurements returned by the Time function.

[jeevatkm]

@cloverkits, I need clarification on your goals and objectives. I will try to provide facts. Typically, goroutine gets used where concurrent/parallelism is required to optimize overall processing time and efficiency.
I think the above goroutine example wouldn't provide valuable information on time measurement.
Have you tried the Go default HTTP client with your goroutine example?

[cloverkits]

@jeevatkm yep! Default HTTP client maybe have something wrong in goroutine. In your words "concurrent/parallelism is required to optimize overall processing time" which is my case. I need reads multiple objects in parallel from one server multi interfaces.

example code

package main

import (
	"io"
	"log"
	"net/http"
	"sync"
	"time"
)

func main() {
	wg := sync.WaitGroup{}

	for i := 0; i < 50; i++ {

		wg.Add(1)
		go func() {
			defer wg.Done()

			startAt := time.Now()
			resp, err := http.Get("https://www.baidu.com")
			if err != nil {
				log.Println(err)
			}
			defer resp.Body.Close()

			log.Println("latency:", time.Since(startAt))

			_, err = io.ReadAll(resp.Body)
			if err != nil {
				log.Println(err)
			}

		}()
	}

	wg.Wait()
}

result

2023/09/25 10:12:23 latency: 69.907033ms
2023/09/25 10:12:23 latency: 69.614386ms
2023/09/25 10:12:23 latency: 70.939928ms
2023/09/25 10:12:23 latency: 70.62763ms
2023/09/25 10:12:23 latency: 71.418996ms
2023/09/25 10:12:23 latency: 72.425473ms
2023/09/25 10:12:23 latency: 78.597691ms
2023/09/25 10:12:23 latency: 81.947911ms
2023/09/25 10:12:23 latency: 82.902086ms
2023/09/25 10:12:23 latency: 84.898575ms
2023/09/25 10:12:23 latency: 84.801553ms
2023/09/25 10:12:23 latency: 84.496353ms
2023/09/25 10:12:23 latency: 85.732495ms
2023/09/25 10:12:23 latency: 85.642949ms
2023/09/25 10:12:23 latency: 85.952062ms
2023/09/25 10:12:23 latency: 86.141165ms
2023/09/25 10:12:23 latency: 87.003269ms
2023/09/25 10:12:23 latency: 87.436695ms
2023/09/25 10:12:23 latency: 91.543479ms
2023/09/25 10:12:23 latency: 91.84506ms
2023/09/25 10:12:23 latency: 92.977854ms
2023/09/25 10:12:23 latency: 93.429503ms
2023/09/25 10:12:23 latency: 94.71919ms
2023/09/25 10:12:23 latency: 95.130987ms
2023/09/25 10:12:23 latency: 97.990181ms
2023/09/25 10:12:23 latency: 98.086186ms
2023/09/25 10:12:23 latency: 98.242818ms
2023/09/25 10:12:23 latency: 98.315098ms
2023/09/25 10:12:23 latency: 98.920861ms
2023/09/25 10:12:23 latency: 99.129425ms
2023/09/25 10:12:23 latency: 100.425497ms
2023/09/25 10:12:23 latency: 101.000571ms
2023/09/25 10:12:23 latency: 101.15033ms
2023/09/25 10:12:23 latency: 100.735866ms
2023/09/25 10:12:23 latency: 101.528584ms
2023/09/25 10:12:23 latency: 101.650535ms
2023/09/25 10:12:23 latency: 101.478554ms
2023/09/25 10:12:23 latency: 104.253945ms
2023/09/25 10:12:23 latency: 104.981183ms
2023/09/25 10:12:23 latency: 105.334097ms
2023/09/25 10:12:23 latency: 105.663269ms
2023/09/25 10:12:23 latency: 106.390947ms
2023/09/25 10:12:23 latency: 106.30004ms
2023/09/25 10:12:23 latency: 107.450104ms
2023/09/25 10:12:23 latency: 110.235126ms
2023/09/25 10:12:23 latency: 110.161177ms
2023/09/25 10:12:23 latency: 110.386901ms
2023/09/25 10:12:23 latency: 110.360874ms
2023/09/25 10:12:23 latency: 110.623886ms
2023/09/25 10:12:23 latency: 111.314326ms