I'm doing a simple load test with Apache JMeter. My ambition was to
benchmark a go server. Here is the code I've been using, its a simple web
server
package main
import (
"fmt"
"log"
"net/http"
"runtime"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "welcome")
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
http.HandleFunc("/function", handler)
log.Fatal(http.ListenAndServe(":8080", nil))
}
When i test the JMeter with 5000 users with Ramp Up Period 1s, Loop Count 1
as stated below
[image: Screenshot_27.png]
The result is as follows, it has *around 20% error rate* for the HTTP
requests.
[image: Screenshot_28.png]
When i examine the reason for an error JMeter states that the *Connection
was refused* by host.
I would like to know how to increase concurrency in here, at least not
dropping the connections in that rate. If the server handler code was bit
complex than this, the error rate is increasing to at least 80%.
I tried the same kind of scenario with Java NIO(*com.sun.net.httpserver*).
It resulted better as it had a lower error rate. But it caused a high
latency when the work is done(Tested with same load).
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