cep21

package main

// Given an interface
type I interface {
	Func()
}

// And another interface
type I2 interface {
	Another()

cep21

> go tool pprof 'localhost:6060/debug/pprof/my_experiment_thing?debug=1' 
Fetching profile from http://localhost:6060/debug/pprof/my_experiment_thing?debug=1
Saved profile in /Users/.../pprof/pprof.localhost:6060.my_experiment_thing.007.pb.gz
Entering interactive mode (type "help" for commands)
(pprof) top30
6 of 6 total (  100%)
      flat  flat%   sum%        cum   cum%
         6   100%   100%          6   100%  main.usesAResource
         0     0%   100%          2 33.33%  main.main.func3
         0     0%   100%          2 33.33%  net/http.(*ServeMux).ServeHTTP

cep21

package main

import (
	"fmt"
	"log"
	"net/http"
	_ "net/http/pprof"
	"os"
	"runtime/pprof"
	"sync/atomic"

cep21

my_experiment_thing profile: total 6
4 @ 0x2245 0x5d961
#	0x2244	main.usesAResource+0x64	/Users/.../pproftest.go:64

2 @ 0x2245 0x2574 0x9c184 0x9d56f 0x9df7d 0x9aa07 0x5d961
#	0x2244	main.usesAResource+0x64			/Users/.../pproftest.go:64
#	0x2573	main.main.func3+0x13			/Users/.../pproftest.go:79
#	0x9c183	net/http.HandlerFunc.ServeHTTP+0x43	/usr/local/Cellar/go/1.7.1/libexec/src/net/http/server.go:1726
#	0x9d56e	net/http.(*ServeMux).ServeHTTP+0x7e	/usr/local/Cellar/go/1.7.1/libexec/src/net/http/server.go:2022
#	0x9df7c	net/http.serverHandler.ServeHTTP+0x7c	/usr/local/Cellar/go/1.7.1/libexec/src/net/http/server.go:2202

cep21

package main

import (
	"bytes"
	"fmt"
	"reflect"
)

func main() {
	buf := bytes.Buffer{}

cep21

s := Stats{}
go s.Loop(ctx)
fmt.Println("I started service", s)

cep21

type Stats struct {
	prev runtime.MemStats
}

func (p *Stats) stats() {
	ms := runtime.MemStats{}
	runtime.ReadMemStats(&ms)
	mallocCount := ms.Mallocs - p.prev.Mallocs
	fmt.Println("malloc change is", mallocCount)
	p.prev = ms

cep21

package main

import (
	"app"
	"store"
)

func main( {
//	./store_main.go:9: cannot use Store literal (type *Store) as type app.Renderable in argument to app.RunApplication:
//		*Store does not implement app.Renderable (wrong type for RenderPage method)

cep21

package app

type Totaller interface {
	Subtotal() float64
}

type Renderable interface {
	RenderPage(t Totaller)
}

cep21

package news

type Totaller interface {
	Subtotal() float64
}

type NewsfeedRenderable struct {}

func (n *NewsfeedRenderable) RenderPage(t Totaller) {