wangzaixiang’s gists

wangzaixiang / test2.c

Created February 18, 2013 09:50

Cache Test

	//gcc -DPAD=0 -o test2_0 test2.c -lpthread;time ./test2_0 -- 6.5s
	//gcc -DPAD=0x0C38 -o test2_0C38 test2.c -lpthread;time ./test2_0C38 -- 15s

	#include <stdio.h>
	#include <pthread.h>
	#include <sys/time.h>

	// very suprise, when PAD = 0x0C38, the speed is slow down
	typedef struct _Block
	{

wangzaixiang / EnumsMacro.scala

Created March 31, 2013 14:30

Macro code to build a enum Just a simple prototype, but maybe useful for future. Learn how to build the AST, I first using the reify and the c.universe.showRaw, and using the scalac -Xprint:4 to show how the compiler generate the reifly code. It is nesseary to learn the reflect API in more deep.

	package wangzx.macros

	import scala.language.experimental.macros
	import scala.reflect.macros.Context
	import java.lang.String
	import scala.reflect.api.Symbols

	object EnumsMacro {

	def docs[A](obj: A): Map[Int, String] = macro docsMacro[A]

wangzaixiang / BindDemo.scala

Last active December 17, 2015 09:48

BindMacro, implements feature such as javafx' expression bind

	package demo

	import reflect_demo.BindMacro._
	import reflect_demo._

	object BindDemo {

	def main(args: Array[String]) {

	val x = Box(10)

wangzaixiang / pie.html

Last active December 18, 2015 02:29

JavaScript Performance Test

	<script languange="javascript">
	var begin = new Date();
	var pie = 0;

	var loop = 1000 * 1000 * 100;

	for(var i=1; i<loop; i++){
	var sign = (i % 2) == 0 ? -1.0 : 1.0;
	pie = pie + sign / (2*i - 1)
	}

wangzaixiang / CodeWriter.scala

Created November 19, 2013 11:04

new Template based on Scala XML

	package demo

	object CodeWriter {

	def main(args: Array[String]) {

	val code = new CodeWriter
	code.println("package wangzx.javabean")
	code.println
	code.println("public class Student extends Object");

wangzaixiang / Client.java

Created December 19, 2013 09:05

JMX Demo

	package jmxdemo;

	import java.io.File;
	import java.util.Set;

	import javax.management.JMX;
	import javax.management.MBeanServerConnection;
	import javax.management.ObjectInstance;
	import javax.management.ObjectName;
	import javax.management.remote.JMXConnector;

wangzaixiang / gist:c1421fd18267812e83d0

Created May 7, 2014 03:22

FizzBuzzWhizz https://www.jinshuju.net/f/EGQL3D

	package fbw

	object FizzBuzzWhizz {

	implicit class RichBoolean(bool: Boolean) {
	def option[T](value:T) = if(bool) Some(value) else None
	}
	implicit class RichOption[T](option:Option[T]) {
	def elseFlatMap(value: =>Option[T]) = option match {
	case Some(_) => option

wangzaixiang / VolatileTest.java

Created June 18, 2014 11:05

Just for test the anti-volatile example, see http://ifeve.com/java-memory-model-1/

	package volatile_demo;

	import java.util.concurrent.BrokenBarrierException;
	import java.util.concurrent.CyclicBarrier;

	public class Test2 {

	int a = 0;
	int b = 0;

wangzaixiang / mysql-lock-waiting.sh

Created November 24, 2016 12:19

a script to capture information for mysql lock waiting

	#!/bin/bash

	# crontab
	# * * * * * /home/wangzx/mysql-lock-wait/mysql_lock_wait_check.sh

	function run_lock_wait() {
	now=`date +%s`
	seq=$(( $now / 30 % 600 )) # rotate 600 log file in 5 hours
	logfile=~/mysql-lock-wait/log/mysql_lock_wait-$seq.log

wangzaixiang / Plugin.scala

Created December 4, 2016 23:59 — forked from lihaoyi/Plugin.scala

	package demo

	import scala.tools.nsc.io.AbstractFile
	import scala.tools.nsc.{Global, Phase}
	import scala.tools.nsc.plugins.{Plugin, PluginComponent}

	class DemoPlugin(val global: Global) extends Plugin {
	import global._
	override def init(options: List[String], error: String => Unit): Boolean = true

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