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Salvatore Sanfilippo antirez

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antirez / huffmancode.rb
Created Apr 2, 2009
recursive huffman coding
View huffmancode.rb
def buildHuffmanCode(ftab)
if ftab.length == 1
ftab
else
ftab = ftab.sort {|a,b| a[0] <=> b[0]}
left = ftab[0]
right = ftab[1]
freq = left[0]+right[0]
left = left[1].map{|x| x.merge({:code => "0"+x[:code]})}
right = right[1].map{|x| x.merge({:code => "1"+x[:code]})}
View gist:120067
# Build an inverted index for a full-text search engine with Redis.
# Copyright (C) 2009 Salvatore Sanfilippo. Under the BSD License.
# USAGE:
#
# ruby invertedindex.rb add somedir/*.c
# ruby invertedindex.rb add somedir/*.txt
# ruby search your query string
require 'rubygems'
require 'redis'
View gist:259466
#!/bin/sh
PIDFILE=/var/run/redis_6379.pid
EXEC=/usr/local/bin/redis-server
CONF="/etc/redis/6379.conf"
REDISPORT=6379
case "$1" in
start)
if [ -f $PIDFILE ]
View Redis interactive memory usage changes reporting script.rb
require 'rubygems'
require 'redis'
def main(opts={})
r = Redis.new(opts)
um = 0
while true do
newum = r.info[:used_memory]
if newum != um && um != 0
diff = newum.to_i-um.to_i
View gist:277164
% ssh -v -i ~/.ssh/DinamicheRosaKeyPair.pem root@79.125.10.167
OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh_config
debug1: Connecting to 79.125.10.167 [79.125.10.167] port 22.
debug1: Connection established.
debug1: identity file /Users/antirez/.ssh/DinamicheRosaKeyPair.pem type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.1p1 Debian-5ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
View gist:277334
SET: 44318.59 requests per second
GET: 44149.78 requests per second
INCR: 46328.70 requests per second
LPUSH: 45325.79 requests per second
LPOP: 44466.67 requests per second
PING: 44287.61 requests per second
View gist:280994
# Power law (log tail) distribution
# Copyright(C) 2010 Salvatore Sanfilippo
# this code is under the public domain
# min and max are both inclusive
# n is the distribution power: the higher, the more biased
def powerlaw(min,max,n)
max += 1
pl = ((max**(n+1) - min**(n+1))*rand() + min**(n+1))**(1.0/(n+1))
(max-1-pl.to_i)+min
View gist:283192
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <math.h>
unsigned long longtailprng(unsigned long min, unsigned long max, int n) {
unsigned long pl;
double r = (double)(random()&(INT_MAX-1))/INT_MAX;
View gist:283372
Usage: redis-load ... options ...
host <hostname> Server hostname (default 127.0.0.1)
port <hostname> Server port (default 6379)
clients <clients> Number of parallel connections (default 50)
requests <requests> Total number of requests (default 10k)
writes <percentage> Percentage of writes (default 50, that is 50%)
mindatasize <size> Min data size of SET values in bytes (default 1)
maxdatasize <size> Min data size of SET values in bytes (default 64)
datasize <size> Set both min and max datasize to the same value
View gist:283886
0 0 8335332 0 134.01M 0B
0 0 8335332 0 134.01M 0B
1272 0 8311296 -24036 134.11M 103.34K
2631 19 8261737 -49559 136.88M 2.77M
224 217 8309262 47525 137.10M 223.38K
89 905 8307781 -1481 136.73M -379.72K
359 1043 8324603 16822 135.72M -1.01M
293 1538 8319361 -5242 135.35M -382.36K
731 1045 8322341 2980 135.00M -352.77K
1030 679 8312372 -9969 134.87M -131.05K
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