zhenjl’s gists

zhenjl / gist:5906950

Last active December 19, 2015 05:49

	<div zn-pages zn-pages-start="0" zn-pages-swipe>
	<ul zn-pages-start="1">
	<li style="background-color: #1abc9c; width: 250px">Pages</li>
	<li style="background-color: #3498db">Main</li>
	</ul>
	<ul zn-pages-start="1">
	<li ng-repeat="val in colors track by $id($index)" style="background-color: {{ val }}; text-align: center; margin: 0 auto">{{ val }}</li>
	</ul>
	<ul>
	<li style="background-color: #95a5a6">Credits</li>

zhenjl / gist:5907237

Last active December 19, 2015 05:49

	var container = znPageManager.container('zn-pages-container-0');
	// or znPageManager.containers()[0]

	$scope.slideLeft = function() { container.slideLeft(); };
	$scope.slideRight = function() { container.slideRight(); };
	$scope.slideDown = function() { container.slideDown(); };
	$scope.slideUp = function() { container.slideUp(); };
	$scope.slideHome = function() { container.slideHome(); };

zhenjl / perlin1d.go

Created July 24, 2013 21:54

Generates 1d perlin noise in Go

	/*
	* Based on algorithm given at http://freespace.virgin.net/hugo.elias/models/m_perlin.htm
	*
	* Borrowed heavily from https://github.com/iand/perlin/blob/master/perlin.go
	*
	* MIT License http://opensource.org/licenses/MIT
	*/

	package main

zhenjl / MsbPack vs BSON Result

Last active December 21, 2015 21:49

	Command: go test -bench=.

	Machine: Macbook Air 10.8.4 1.8GHz Intel Core i5 4GB 1600MHz DDR3

	BSON (message size = 152)
	----
	BenchmarkMarhsal 200000 6638 ns/op
	BenchmarkUnmarshall 200000 9599 ns/op

	MsgPack (message size = 126)

zhenjl / Partitioned Bloom Filter Test Output

Last active December 22, 2015 06:49

	Testing fnv.New64() with size 235886
	m = 3391472, n = 235886, k = 10, s = 339148, p = 0.500000, e = 0.001000
	Total items: 235886
	Bits in partition 0: 170044 (50.1%)
	Bits in partition 1: 170171 (50.2%)
	Bits in partition 2: 169914 (50.1%)
	Bits in partition 3: 170022 (50.1%)
	Bits in partition 4: 170144 (50.2%)
	Bits in partition 5: 169979 (50.1%)
	Bits in partition 6: 170080 (50.1%)

zhenjl / Updated Bloom Filter Benchmark

Last active December 22, 2015 18:49

These new benchmark results are after I removed the "make([]uint, this.k)" from bits() function. Instead we just do a make at the New() time, and re-use the same slice for each add/check.

	Partitioned Bloom Filter
	------------------------
	BenchmarkBloomFNV64 1000000 1032 ns/op
	BenchmarkBloomCRC64 1000000 1032 ns/op
	BenchmarkBloomMurmur3 1000000 1008 ns/op (ignore, invalid due to murmur3 impl or incorrect usage)
	BenchmarkBloomCityHash 1000000 3345 ns/op (ignore, most likely slow due to my cityhash impl)
	BenchmarkBloomMD5 1000000 2349 ns/op
	BenchmarkBloomSha1 1000000 2551 ns/op

	Standard Bloom Filter

zhenjl / EWAH Benchmark Wrapper Generator

Last active December 23, 2015 04:08

	# h = operations
	# i = # of bits for bitmap 1
	# j = # of bits for bitmap 2
	# k = random distance between bits for bitmap 1 (0-k) - indicates sparsity
	# l = random distance between bits for bitmap 1 (0-l) - indicates sparsity
	for h in and or xor andnot
	do
	for i in 100 10000 1000000
	do
	for j in 100 10000 1000000

zhenjl / Cityhash Profiling

Last active December 27, 2015 23:29

	package codesearch

	import (
	"bufio"
	"compress/gzip"
	"encoding/binary"
	"fmt"
	"github.com/reducedb/cityhash"
	"log"
	"os"

zhenjl / Testing Different Ways of Setting and Copying a Slice

Last active December 28, 2015 11:39

	--- Output of using gccgo -O3 ---
	BenchmarkOffset2 50000000 27.6 ns/op
	BenchmarkOffset 50000000 32.0 ns/op
	BenchmarkRange 500000000 4.46 ns/op
	BenchmarkUnrolled 200000000 8.92 ns/op
	BenchmarkCopy 500000000 7.52 ns/op
	BenchmarkRangeCopy 100000000 13.9 ns/op
	BenchmarkCopyUnrolled 200000000 8.91 ns/op

	--- Output of using standard go compiler ---

zhenjl / compress.go

Last active April 21, 2016 12:04

	package main

	import (
	"bytes"
	"code.google.com/p/snappy-go/snappy"
	"github.com/cznic/zappy"
	"compress/gzip"
	"compress/lzw"
	"flag"
	"fmt"

Jian Zhen zhenjl