leepro

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

leepro

Selenium with Python

Author:	Baiju Muthukadan
Email:	baiju.m.mail AT gmail.com
Version:	0.5.0

leepro

// $ 6g echo.go && 6l -o echo echo.6
// $ ./echo
//
//  ~ in another terminal ~
//
// $ nc localhost 3540

package main

import (

leepro

package main
import (
    "net"
    "os"
)

func main() {
    strEcho := "Halo"
    servAddr := "localhost:6666"
    tcpAddr, err := net.ResolveTCPAddr("tcp", servAddr)

leepro

2015-11-17 16:24:23,399: ERROR ajp-bio-0.0.0.0-8010-exec-85 nl.greenvalley.archiving.core.storage.jdbcfs.virtual.VirtualSnapshotBuildingService - Create virtual snapshot, headers, and set build status for Snapshot ID [29448636] took [2545] milliseconds.
2015-11-17 16:24:23,625: ERROR ajp-bio-0.0.0.0-8010-exec-85 nl.greenvalley.archiving.core.storage.jdbcfs.virtual.VirtualSnapshotBuildingService - Trying to call snapshot building procedure for fullcrawl snapshot
2015-11-17 16:24:25,259: ERROR ajp-bio-0.0.0.0-8010-exec-90 nl.greenvalley.archiving.core.storage.jdbcfs.virtual.VirtualSnapshotBuildingService - Create virtual snapshot, headers, and set build status for Snapshot ID [29448636] took [1531] milliseconds.
2015-11-17 16:24:27,031: ERROR ajp-bio-0.0.0.0-8010-exec-93 nl.greenvalley.archiving.core.storage.jdbcfs.virtual.VirtualSnapshotBuildingService - Create virtual snapshot, headers, and set build status for Snapshot ID [29448636] took [3303] milliseconds.
2015-11-17 16:24:28,742: ERROR ajp-bio-0.0.0.0-801

leepro

#!/bin/bash

while :
do
    clear
    git --no-pager log --graph --pretty=oneline --abbrev-commit --decorate --all $*
    sleep 1
done

leepro

import (
    "syscall"
    "unsafe"
)

type winsize struct {
    Row    uint16
    Col    uint16
    Xpixel uint16
    Ypixel uint16

leepro

package main

/*
#cgo CFLAGS: -x objective-c
#cgo LDFLAGS: -framework Cocoa
#import <Cocoa/Cocoa.h>

int
StartApp(void) {
    [NSAutoreleasePool new];

leepro

package main

import (
	"net/http"
)

type SingleHost struct {
	handler     http.Handler
	allowedHost string
}

leepro

#include <Cocoa/Cocoa.h>

extern void ButtonClick(void);

@interface GoPasser : NSObject
+ (void)buttonClick:(id)sender; // this should call the cgo function defined in main.go
@end

void StartApp(void);