Closed
Description
This issue is found using 1.0.3, 1.1 rc1, & 1.1 rc3
Here's what I'm finding... I saw the ab issue, but I'm not sure it's related.
I'm using a simple web app..
package main
import (
"encoding/json"
"net/http"
)
// structs
type Reading struct {
Id string `json:"id"`
Name string `json:"name"`
}
func main() {
http.HandleFunc("/machines/", func(w http.ResponseWriter, r *http.Request) {
// Setup readings
readings := prepareReadings()
// return readings
w.Write([]byte(readingsToString(readings)))
})
http.ListenAndServe(":3000", nil)
}
func readingsToString(readings []Reading) string {
data, err := json.Marshal(readings)
if err != nil {
panic(err)
}
return string(data)
}
func prepareReadings() []Reading {
var readings []Reading
for i := 1; i <= 1; i++ {
readings = append(readings, Reading{Name: "Thing"})
}
return readings
}
As you can see not much to it. I've setup multiple load generation servers that are
separate from the web server itself. So in total I have 17 machines. 1 web server, and
16 load generation servers. On the load generation servers I am using siege, not ab.
Running this command on all servers: siege -v "http://192.168.122.31:3000/machines/
POST" -c 500 -r 100 -b
Causes me to start getting connection timed out messages.
My file descriptor limits for the web server are pretty high...
[api #3312 -- limits]
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 59479 59479 processes
Max open files 4999999 4999999 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 59479 59479 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
When I use the command 'lsof | wc -l', I dont' get above 1000. Generally in the ~800-850
range.
When I use the command 'watch --interval=2 'netstat -tuna |grep "SYN_RECV"|wc
-l'', I am generally in the ~130-250 range.
I'm not sure if this is related, or possibly a problem with siege at this point.
Any advice?