This might not be due to Go, but rather due to a resource limit imposed by
the operating system:
# 5000. *. (1. -. 0.1954);;
- : float = 4023.
This is close to 4096, assuming a constant factor of other stuff needing
resources. Also, as a first step, I'd recommend running your load generator
on a host separate from the system under test. There are situations in
which your load generator takes enough resources to mess with the SUT.
On Mon, Jan 14, 2019 at 12:48 PM Kasun Vithanage <alanka...@gmail.com>
wrote:
> 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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--
J.
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