I would also try to test the load on a different host too.
On Monday, January 14, 2019 at 6:38:27 PM UTC+5:30, Jesper Louis Andersen
wrote:
>
> 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 <alan...@gmail.com
> <javascript:>> 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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