cchandler’s gists

cchandler / gist:232643

Created November 12, 2009 06:09


	//Play with context

	#define _XOPEN_SOURCE

	#include<stdlib.h>
	#include<stdio.h>
	#include<string.h>
	#include<ucontext.h>

cchandler / gist:326173

Last active September 4, 2015 12:55

my 100 things

	Kitchen island
	red vase
	wallet
	fleece beanie
	Vibram five fingers (2x)
	sneakers
	santoni shoes
	iPhone
	belt
	MissionWorkshop backpack

cchandler / gist:373439

Created April 21, 2010 04:59

	module CassandraAccess
	def self.included(mod)
	mod.class_eval do
	def cassandra
	@@cassandra \|\|= Cassandra.new(@@keyspace, @@host)
	end

	def self.cassandra
	@@cassandra \|\|= Cassandra.new(@@keyspace, @@host)
	end

cchandler / gist:593817

Created September 23, 2010 15:39

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6vK1od2C01fFOH8ZCeio3jkL+0v4oM6MiumrXqLVUgre4O79rbxA2k2tjNv8XsAnYGxdYCfKWjlOg4OvXk+CMgmPiw+RjDdGSLw65XfGfDxQBqEMgB4O7ApodcT+RmrjmLsXvGK0TF8FWDD+x+I4scF2HsbnFGaU416kLYXvCGJkJZVxR9MJBHkIy6f3cM3b9OLkyZ89qQuPGawv3YPZ4/R4EvbvbgVCn9IBpCqKDe3LHhGS/HEMdSQ2Y+asX83R4SpFwlaFdFW5UJysUaBaaBkBiE85bKMwzAsd6NcmKcoFHIVYbayy/NOQobZhL9+4FdU0oRuu1ZuTG1pTZMxElw== [email protected]

cchandler / gist:603460

Created September 29, 2010 20:19

Basic Cassandra 0.7 examples


	require 'cassandra/0.7'

	client = Cassandra.new("Sample", "127.0.0.1:9160") # Sample is the Keyspace

	# The client tries to discover all nodes the hard way. This will prevent timeouts
	# from their IPs not being publicly available.
	client.disable_node_auto_discovery!

	### Inserting data

cchandler / gist:712697

Created November 23, 2010 22:48

	avg-cpu: %user %nice %system %iowait %steal %idle
	0.75 0.00 4.00 0.00 0.00 95.25

	Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
	sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
	sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9223372036854774.00 0.00 0.00 100.05
	sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.00 0.00 0.00 100.05
	sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
	dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
	dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

cchandler / gist:753685

Created December 23, 2010 23:26

Correct opcode

	4013c8: e8 eb f9 ff ff callq 400db8 <printf@plt>
	4013cd: c7 45 ec 00 00 00 00 movl $0x0,-0x14(%rbp)
	4013d4: eb 45 jmp 40141b <main+0x2d7>
	4013d6: 8b 45 ec mov -0x14(%rbp),%eax
	4013d9: 48 98 cltq
	4013db: 48 c1 e0 03 shl $0x3,%rax
	4013df: 48 03 45 e0 add -0x20(%rbp),%rax
	4013e3: 48 8b 00 mov (%rax),%rax
	4013e6: 48 89 85 18 fe ff ff mov %rax,-0x1e8(%rbp)
	4013ed: be 4b 1a 40 00 mov $0x401a4b,%esi

cchandler / gist:753686

Created December 23, 2010 23:27

Incorrect opcode

	4015d5: e8 ce f9 ff ff callq 400fa8 <printf@plt>
	4015da: 45 31 e4 xor %r12d,%r12d
	4015dd: 45 85 ed test %r13d,%r13d
	4015e0: 48 89 dd mov %rbx,%rbp
	4015e3: 7e 32 jle 401617 <main+0x197>
	4015e5: 48 8b 5d 00 mov 0x0(%rbp),%rbx <--- Line that segfaults because %rbp is empty
	4015e9: be bf 1f 40 00 mov $0x401fbf,%esi
	4015ee: bf 20 31 60 00 mov $0x603120,%edi
	4015f3: e8 b0 fa ff ff callq 4010a8 <_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc@plt>
	4015f8: 48 89 c7 mov %rax,%rdi

cchandler / gist:827103

Created February 15, 2011 04:45

	histogram = {180=>0, 256=>0, 237=>1, 275=>0, 190=>1, 228=>0, 266=>0, 133=>1, 209=>0, 247=>1, 257=>1, 86=>0, 162=>1, 200=>1, 238=>1, 29=>1, 143=>1, 181=>0, 153=>0, 191=>1, 229=>0, 267=>0, 134=>1, 172=>1, 210=>1, 115=>1, 87=>1, 201=>1, 239=>1, 182=>0, 220=>1, 135=>1, 173=>1, 249=>1, 31=>0, 240=>0, 107=>0, 183=>1, 221=>1, 259=>1, 88=>0, 126=>1, 98=>0, 79=>1, 193=>1, 22=>0, 231=>0, 269=>0, 241=>0, 70=>0, 184=>1, 260=>1, 89=>0, 213=>1, 251=>0, 156=>1, 194=>0, 232=>1, 270=>0, 147=>1, 223=>0, 261=>1, 204=>0, 242=>0, 100=>0, 252=>0, 176=>0, 233=>1, 214=>0, 148=>0, 72=>0, 262=>1, 243=>0, 129=>1, 224=>0, 53=>0, 205=>0, 91=>0, 139=>1, 272=>1, 234=>0, 25=>1, 196=>0, 158=>0, 253=>0, 225=>1, 187=>1, 244=>0, 130=>1, 92=>1, 111=>0, 254=>1, 216=>0, 273=>1, 235=>0, 197=>1, 264=>0, 226=>0, 188=>0, 131=>0, 245=>0, 236=>1, 217=>1, 141=>0, 265=>0, 151=>0, 246=>0, 227=>0, 189=>0, 208=>0, 170=>1}

	final_histogram = {}
	histogram.sort(){\|a,b\| histogram[a[0]] <=> histogram[b[0]] }.map do \|i\|
	final_histogram[i[0]] = i[1]
	end

	p final

cchandler / gist:939951

Created April 24, 2011 22:55

glpk model for cloud vs colo costs

	#Colo Server costs

	set ServerTypes;
	set InstanceTypes;

	param CoreDemand; #How many cores do we need for a workload
	param OurMoney; #The maximum upper-bound of what we're willing to spend
	param ColoCostPerU; #How much are we paying per U of colocation
	param Months; # How many months do we know we need this hardware

Chris Chandler cchandler