demo/digitalocean: add bench app

demo/digitalocean/app/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/hashicorp/nomad/api"
+	"github.com/hashicorp/nomad/nomad/structs"
+)
+
+func main() {
+	client, err := api.NewClient(api.DefaultConfig())
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	total := 4000
+	running := 0
+	start := time.Now()
+	allocClient := client.Allocations()
+
+	fmt.Printf("benchmarking %d allocations\n", total)
+	for i := 0; ; i++ {
+		time.Sleep(100 * time.Millisecond)
+
+		allocs, _, err := allocClient.List(nil)
+		if err != nil {
+			fmt.Println(err.Error())
+
+			// keep going to paper over minor errors
+			continue
+		}
+		now := time.Now()
+
+		for _, alloc := range allocs {
+			if alloc.ClientStatus == structs.AllocClientStatusRunning {
+				if running == 0 {
+					fmt.Println("time to first running: %s", now.Sub(start))
+				}
+				running++
+			}
+		}
+
+		if i%10 == 0 || running == total {
+			fmt.Printf("%d running after %s\n", running, now.Sub(start))
+		}
+
+		if running == total {
+			return
+		}
+	}
+}