http too many open file

[at15]

When benchmarking in localhost, got the error, could because the loader and the server is in the same machine, need to containerize xephon-k to confirm this.

Seems related to traefik/traefik#157 and traefik/traefik#127 Though I am not sure if the MaxIdleConnection per host applies to server, I know it works for client.

[at15]

Also from the client part, it seems the maxidle connection (not per host) can also be tuned http://tleyden.github.io/blog/2016/11/21/tuning-the-go-http-client-library-for-load-testing/

  // Customize the Transport to have larger connection pool
  defaultRoundTripper := http.DefaultTransport
  defaultTransportPointer, ok := defaultRoundTripper.(*http.Transport)
  if !ok {
      panic(fmt.Sprintf("defaultRoundTripper not an *http.Transport"))
  }
  defaultTransport := *defaultTransportPointer // dereference it to get a copy of the struct that the pointer points to
  defaultTransport.MaxIdleConns = 100
  defaultTransport.MaxIdleConnsPerHost = 100

[at15]

seems to be deal with ulimit ? my default hard limit is 4096 based on /proc/pid/limits

ulimit -Sn 4096

The file-max can be found on /proc/sys/fs and my default is 3257324, which is much larger .... need to change it I think

[at15]

Close in favor of #60

Adjust ulimit