gagliardetto

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

gagliardetto

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

gagliardetto

How to reopen a pull-request after a force-push?

Precodinitions

• You need the rights to reopen pull requests on the repository.
• The pull request hasn't been merged, just closed.

Instructions

1. Write down the current commit hash of your PR-branch git log --oneline -1 <PR-BRANCH>
2. Write down the latest commit hash on github before the PR has been closed.
3. git push -f origin :

gagliardetto

package main

import (
	"reflect"
	"strings"
)

func makeChannel(t reflect.Type, chanDir reflect.ChanDir, buffer int) reflect.Value {
	ctype := reflect.ChanOf(chanDir, t)
	return reflect.MakeChan(ctype, buffer)

gagliardetto

#!/bin/bash 
# A simple script to backup an organization's GitHub repositories.

# NOTE: if you have more than 100 repositories, you'll need to step thru the list of repos 
# returned by GitHub one page at a time, as described at https://gist.github.com/darktim/5582423

GHBU_BACKUP_DIR=${GHBU_BACKUP_DIR-"github-backups"}                  # where to place the backup files
GHBU_ORG=${GHBU_ORG-"<CHANGE-ME>"}                                   # the GitHub organization whose repos will be backed up
                                                                     # (if you're backing up a user's repos instead, this should be your GitHub username)
GHBU_UNAME=${GHBU_UNAME-"<CHANGE-ME>"}                               # the username of a GitHub account (to use with the GitHub API)

gagliardetto

package main

import (
	"fmt"
	"time"

	"github.com/davecgh/go-spew/spew"
)

func main() {

gagliardetto

package main

import (
	"encoding/json"
	"errors"
	"fmt"
)

type Notification struct {
	Error error `json:"error"`

gagliardetto

package main

import "fmt"

func main() {
	user := User{}

	// Set the group:
	groupSetter("admin", user)

gagliardetto

package main

import (
    "crypto/tls"
    "crypto/x509"
    "fmt"
    "io"
    "log"
)

gagliardetto

package main

import (
	"bytes"
	"encoding/gob"
	"fmt"
)

type MyFace interface {
	A()