joaomlneto

root@ubuntu:~# ./a.out
Reading 40 bytes:
Reading at malicious_x = 0xffffffffffdfeba8... Unclear: 0x54='T' score=980 (second best: 0x02 score=706)
Reading at malicious_x = 0xffffffffffdfeba9... Unclear: 0x68='h' score=929 (second best: 0x02 score=709)
Reading at malicious_x = 0xffffffffffdfebaa... Unclear: 0x65='e' score=973 (second best: 0x02 score=786)
Reading at malicious_x = 0xffffffffffdfebab... Unclear: 0x20=' ' score=928 (second best: 0x02 score=784)
Reading at malicious_x = 0xffffffffffdfebac... Unclear: 0x4D='M' score=746 (second best: 0x02 score=730)
Reading at malicious_x = 0xffffffffffdfebad... Unclear: 0x61='a' score=978 (second best: 0x02 score=749)
Reading at malicious_x = 0xffffffffffdfebae... Success: 0x67='g' score=39 (second best: 0x02 score=17)
Reading at malicious_x = 0xffffffffffdfebaf... Unclear: 0x69='i' score=972 (second best: 0x02 score=748)

joaomlneto

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

joaomlneto

joaomlneto

#define _GNU_SOURCE
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <numa.h>
#include <numaif.h>

void printmask(char *name, struct bitmask *mask) {
	printf("%s: ", name);

joaomlneto

/* When using Boost's program_options to load environment variables,
 * there is no way of telling boost to ignore those that were not
 * specified in the `options_description` object.
 *
 * This snippet shows how to get similar behavior to the 
 * `allow_unregistered()` option available to command line and
 * configuration file parsers.
 *
 *
 * For example, if you try to read MYLIB_ONE by specifying an option

joaomlneto

################################################
# Stolen from Michal Fapso's answer:           #
# https://stackoverflow.com/a/34061874/4288486 #
################################################

sudo apt-get install libiberty-dev binutils-dev
mkdir ~/install
cd ~/install
# If the following apt-get doesn't work on your system,
# uncomment deb-src lines in your /etc/apt/sources.list,

joaomlneto

These commands are based on a askubuntu answer http://askubuntu.com/a/581497
To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below.
USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING.
ABSOLUTELY NO WARRANTY.

If you are still reading let's carry on with the code.

sudo apt-get update && \
sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \

joaomlneto

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <unistd.h>
#include <sys/mman.h>

#define SIZE (1ull<<35) // 32GB
#define N (SIZE/sizeof(uint64_t))
#define NTIMES 100

joaomlneto

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <ucontext.h>
#include <fcntl.h>
#include <execinfo.h>
#include <sys/mman.h>

joaomlneto

#!/usr/bin/env bash

# mount /home/joaomlneto @ linux-vm
mkdir -p /Users/joaomlneto/nfs/linux-vm
mount -t nfs -o nolocks,locallocks,rw,soft,intr,rsize=8192,wsize=8192,timeo=900,retrans=3,proto=tcp \
linux-vm:/home/joaomlneto \
/Users/joaomlneto/nfs/linux-vm