cluno

import Denotational._

/**
 * Video: http://www.parleys.com/play/53a7d2c9e4b0543940d9e553
 * Slide: https://dl.dropboxusercontent.com/u/7083182/scaladays-slides/DenotationalSemantics.compressed.pdf
 * 
 * For being a better Functional Programmer
 * "Fold and unfold for program semantics" by Graham Hutton 
 *  - http://eprints.nottingham.ac.uk/230/1/semantics.pdf
 * 

fasiha

Understanding overlapping memory transfers and kernel execution for very simple CUDA workflows

Executive summary

This small exploration started when Dr Jon Rogers mentioned that one could get overlapping memory transfer and kernel execution by using device-mapped page-locked host memory (see section 3.2.4, Page-Locked Host Memory, of the CUDA C Programming Guide version 6.0) even for simple CUDA workflows, i.e., copying some data from the host to device, operating on that data on the device, and

lawliet89

// Credits: http://goo.gl/NtaADC
// Inline PTX assembly

uint add_asm(uint *result, const uint *a, const uint *b) {
  uint carry;
  asm("{\n\t"
      "add.cc.u32      %0,  %9, %17; \n\t"
      "addc.cc.u32     %1,  %10, %18; \n\t"
      "addc.cc.u32     %2, %11, %19; \n\t"
      "addc.cc.u32     %3, %12, %20; \n\t"

mangecoeur

Easy parallel python with concurrent.futures

As of version 3.3, python includes the very promising concurrent.futures module, with elegant context managers for running tasks concurrently. Thanks to the simple and consistent interface you can use both threads and processes with minimal effort.

For most CPU bound tasks - anything that is heavy number crunching - you want your program to use all the CPUs in your PC. The simplest way to get a CPU bound task to run in parallel is to use the ProcessPoolExecutor, which will create enough sub-processes to keep all your CPUs busy.

We use the context manager thusly:

with concurrent.futures.ProcessPoolExecutor() as executor:

OliverUv

#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define rgbtoy(b, g, r, y)						\
    y=(unsigned char)(((int)(30*r) + (int)(59*g) + (int)(11*b))/100)

#define rgbtoyuv(b, g, r, y, u, v)					\

Faxn

import argparse, locale, timeit, random
from math import *

"""
We are given the following problem:
 
Given a text file with 999,999 lines, one number per line,
numbers in random order from 1 to 1,000,000 but a single number is
missing, figure out what number is missing.
Source: http://blog.moertel.com/posts/2013-12-14-great-old-timey-game-programming-hack.html#comment-1165807320

tmoertel

Tom Moertel <[email protected]>
2013-12-16

We are given the following problem:

    Given a text file with 999,999 lines, one number per line,
    numbers in random order from 1 to 1,000,000 but a single number is
    missing, figure out what number is missing.

    Source: http://blog.moertel.com/posts/2013-12-14-great-old-timey-game-programming-hack.html#comment-1165807320

UsageTrackingBlock.cs

namespace TryOuts
{
    using System.Linq;
    using System.Diagnostics;
    using System.Collections.Generic;

    /// <summary>
    /// Tracks usage of a block of 2^14 (16384) slots using a bitmap that 
    /// contains the 16384 used/free bit flags for each slot (taking up a 
    /// total space of 2048 bytes, accessed as an array of 512 ints), in 

FenwickTreeBitmap32.cs

namespace TryOuts
{
    using System;
    using System.Diagnostics;
    using System.Runtime.CompilerServices;

    /// <summary>
    /// Tracker for usage of a block of 32 consecutive slots. Implemented as a 
    /// Fenwick tree with indexing optimized for queries. Encodes this 
    /// information into a long (64 bit) value, while leaving the high bit 

badboy

Original link: http://www.concentric.net/~Ttwang/tech/inthash.htm
Taken from: http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm
Reformatted using pandoc

Integer Hash Function

Thomas Wang, Jan 1997

last update Mar 2007