Alsman omigo

omigo / inthash.c

Created January 5, 2018 02:26 — forked from lh3/inthash.c

Invertible integer hash functions

	/*
	For any 1<k<=64, let mask=(1<<k)-1. hash_64() is a bijection on [0,1<<k), which means
	hash_64(x, mask)==hash_64(y, mask) if and only if x==y. hash_64i() is the inversion of
	hash_64(): hash_64i(hash_64(x, mask), mask) == hash_64(hash_64i(x, mask), mask) == x.
	*/

	// Thomas Wang's integer hash functions. See <https://gist.github.com/lh3/59882d6b96166dfc3d8d> for a snapshot.
	uint64_t hash_64(uint64_t key, uint64_t mask)
	{
	key = (~key + (key << 21)) & mask; // key = (key << 21) - key - 1;

omigo / consumer.sh

Created July 21, 2017 08:29 — forked from dongjinleekr/consumer.sh

Kafka benchmark commands

	## Consumer Throughput: Single consumer thread, no compression
	## Consumer Throughput: 3 consumer thread, no compression

	bin/kafka-consumer-perf-test.sh --topic benchmark-3-3-none \
	--zookeeper kafka-zk-1:2181,kafka-zk-2:2181,kafka-zk-3:2181 \
	--messages 15000000 \
	--threads 1

omigo / 在线预览本地图片.html

Created July 29, 2016 03:55 — forked from yangsaipp/在线预览本地图片.html

在线预览本地图片，html5

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>本地图片在线预览</title>
	</head>
	<body>
	<script type="text/javascript">
	var result=document.getElementById("result");
	var file=document.getElementById("file");

omigo / tree.go

Created December 13, 2015 05:07

go 语言模拟 shell 命令 `tree <DIR>`

	// Package main go 语言模拟 shell 命令 `tree <DIR>`
	package main

	import (
	"errors"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	)

omigo / shuffle_test.go

Created July 4, 2015 04:32

Apply some bijection in the 0..(n-1) domain to shuffle things a bit...

	package tmp

	import (
	"fmt"
	"testing"
	)

	// https://stackoverflow.com/questions/18709855/semi-reversible-integer-hash-please-keep-an-open-mind/18713986#18713986
	// http://www.wolframalpha.com/input/?i=multiplicative+inverse+of+7+mod+100000000
	func TestShuffle(t *testing.T) {

omigo / inthash_test.go

Last active August 29, 2015 14:24

int hash test

	package tmp

	import (
	"fmt"
	"math"
	"math/rand"
	"testing"

	"github.com/CardInfoLink/angrycard/util"
	)

omigo / inthash.md

Last active August 29, 2015 14:24 — forked from badboy/inthash.md

Integer Hash Function

Thomas Wang, Jan 1997

last update Mar 2007