Tech news


publié le 18 juil. 2014, 02:49 par Pascal Fares

Méthodes Agile

Big Data Without Big Database—Extreme In-Memory Caching for Better Performance,

publié le 17 nov. 2013, 14:06 par Pascal Fares

There's only one week left to REGISTER for "Big Data Without Big Database—Extreme In-Memory Caching for Better Performance," presented onWednesday, November 20, 2013, at 1 pm ET (12 noon CT/11 am MT/10 am PT/5 pm GMT) by Kate Matsudaira, Founder and CEO of popforms. The talk will be followed by a live question and answer session with Kate, moderated by Terry Coatta, CTO of Marine Learning Systems and a member of the ACM Practitioner Board. (If you'd like to attend but can't make it to the virtual event, you still need to register to receive a recording of the webinar when it becomes available.)

Note: You can stream this and all ACM Learning Webinars on your mobile device, including smartphones and tablets.)

These days it is not uncommon to have 100s of gigabytes of data that must be sliced and diced, then delivered fast and rendered quickly. Typically solutions involve lots of caching and expensive hardware with lots of memory. And, while those solutions certainly can work, they aren’t always cost-effective, or feasible in certain environments (like in the cloud). This talk seeks to cover some strategies for caching large data sets without tons of expensive hardware, but through software and data design. 

It’s common wisdom that serving your data from memory dramatically improves application performance and is a key to scaling. However, caching large datasets brings its own challenges: distribution, consistency, dealing with memory limits, and optimizing data loading just to name a few. This talk will go through some of the challenges, and solutions, to achieve fast data queries in the cloud. The audience will come away armed with a number of practical techniques for organizing and building caches for non-transactional datasets that can be applied to scale existing systems, or design new systems. 

Duration: 60 minutes 

PresenterKate MatsudairaFounder and CEO, popforms 
Kate Matsudaira specializes in creating and operating large-scale web applications. Her focus has primarily rested on SaaS applications and big data. She has extensive experience building and managing high-performance teams, and considers herself a fan of agile development practices and the lean startup movement. Kate is currently founding her own startup, popforms, but has held roles as developer, project manager, product manager, and people manager at companies including Amazon and Microsoft. The last seven years she has been a VP of Engineering/CTO for companies like Moz, Decide (acquired by eBay), and prior to that Delve Networks (acquired by Limelight). She is also one of the curators of the Technology and Leadership Newsletter (TLN). You can follow Kate's blog to see her writings on tech and leadership. 

ModeratorTerry CoattaCTO, Marine Learning Systems; ACM Practitioners Board 
Terry Coatta is currently CTO for Marine Learning Systems. Marine Learning Systems is an eLearning software and services provider to the maritime and resource industry. Prior to Marine Learning Systems,Terry was President of AssociCom, a Vancouver-based start-up that builds online communities for professional and trade associations. His expertise lies in the areas of software architecture and software development. As CTO for Vitrium Systems Inc., he led the development organization through the release of three new products, and the customer base expanded from under 10 to over 200. From 2001 to 2005, he was the VP of Development at Silicon Chalk Inc. where he led a team developing a unique real-time collaboration tool for use at universities and colleges. Terry was also a founding partner in Network Software Group Inc. (acquired by Open Text Corporation, 1996) and Director of Software Development at GPS Industries Inc. An active ACM volunteer, Terry serves on the ACM Practitioners Board and Queue Editorial Board, and chairs the Case Study Committee. 

Click here to register for this free webinar and be sure to share this with friends and colleagues who may be interested in this topic. And check out our past events, all available on demand.

Quick Start OpenStack

publié le 3 juin 2013, 00:18 par Pascal Fares

Quick Start This ain't your first rodeo

  1. Install Ubuntu 12.04 (Precise) or Fedora 16

    In order to correctly install all the dependencies, we assume a minimal version of Ubuntu or Fedora to make it as easy as possible. OpenStack runs and is packaged on other flavors of Linux such as OpenSUSE and Debian. We recommend using a minimal install of Ubuntu or Fedora server in a VM if this is your first time.

  2. Download DevStack

    git clone git://

    The devstack repo contains a script that installs openstack and templates for configuration files

  3. Start the install

    cd devstack; ./

    It takes a few minutes, we recommend reading the script while it is building.

Guides Walk through various setups used by stackers

OpenStack on VMs

Virtual MachineRun OpenStack in a VM. The VMs launched in your cloud will be slow as they are running in QEMU (emulation), but it is useful if you don't have spare hardware laying around.Read »
1 Guide

What is this?

These guides tell you how to virtualize your OpenStack cloud in virtual machines. This means that you can get started without having to purchase any hardware.

OpenStack on Hardware

All-In-OneRun OpenStack on dedicated hardware to get real performance in your VMs. This can include a server-class machine or a laptop at home.Read »
Multi-Node + VLANsSetup a multi-node cluster with dedicated VLANs for VMs & Management.Read »
Stack-in-a-BoxRun OpenStack from a RAM disk to give it a spin without touching your existing OS installation. Includes PXE and USB boot methods.Read »
3 Guides

What is this?

These guides tell you how to deploy a development environment on real hardware. Guides range from running OpenStack on a single laptop to running a multi-node deployment on datacenter hardware.

Documentation Help yourself to stack


An overview of DevStack goals and priorities.

Recent Changes

An incomplete summary of recent changes to DevStack.


The DevStack FAQ.

Scripts Generated documentation of DevStack scripts.

stack.shRead »
functionsRead »
lib/baremetalRead »
lib/ceilometerRead »
lib/cinderRead »
lib/databaseRead »
lib/glanceRead »
lib/heatRead »
lib/horizonRead »
lib/keystoneRead »
lib/ldapRead »
lib/novaRead »
lib/quantumRead »
lib/rpc_backendRead »
lib/swiftRead »
lib/tempestRead »
lib/tlsRead »
unstack.shRead »
exercise.shRead »
exercises/aggregates.shRead »
exercises/boot_from_volume.shRead »
exercises/bundle.shRead »
exercises/client-args.shRead »
exercises/client-env.shRead »
exercises/euca.shRead »
exercises/floating_ips.shRead »
exercises/horizon.shRead »
exercises/quantum-adv-test.shRead »
exercises/sec_groups.shRead »
exercises/swift.shRead »
exercises/volumes.shRead »
tools/info.shRead »
tools/install_prereqs.shRead »
tools/upload_image.shRead »
34 bash scripts

Configuration Setting the table

openrcRead »
stackrcRead »
localrcRead »
exercisercRead »
eucarcRead »
5 configuration files

Samples Generated documentation of DevStack sample files.

local.shRead »
localrcRead »
2 sample files

© Openstack Foundation 2011-2013 — Created by Rackspace Cloud Builders — this is also not an official OpenStack project.

Le chômage des informaticiens à l'arrêt en avril

publié le 3 juin 2013, 00:14 par Pascal Fares

Chiffres : En avril, le nombre de demandeurs d’emplois dans l’informatique et les télécoms stagne à 36.600 (catégories ABC), ce qui met fin à trois mois consécutifs de baisse.

La rédaction de

Par La rédaction de | Vendredi 31 Mai 2013

Au niveau national, tous domaines confondus, avril est un nouveau mois de hausse du chômage, avec près de 40.000 demandeurs d’emplois en plus. C’est donc un nouveau, et sinistre, record du chômage en France.

Pour les métiers des systèmes d’information et des télécoms, le contexte est un peu différent avec trois mois consécutifs de baisse. Avril marque toutefois une pause dans cette tendance avec un nombre de chômeurs qui stagne à 36.600 (catégories ABC), soit autant qu’en mars.

Nombre de chômeurs dans l'IT sur un an (dizaines demilliers)CatégorieACatégoriesABCavr.-12May-2012Jun-2012juil.-12Aug-2012sept.-12oct.-12nov.-12déc.-12janv.-13févr.-13Mar-2013Avr-20132428323640Source Pôle emploi - via

En ce qui concerne les demandeurs d’emploi de catégorie A (sans aucune activité sur la période), une très légère baisse est à noter. Le ralentissement du recul du nombre d’informaticiens au chômage(ABC) semble donc se confirmer (-800 en janvier, -400 en février, -300 en mars et donc -100 en avril).

Par ailleurs, sur un an, le chômage dans la profession reste encore largement orienté à la hausse : +16%. Et la situation ne devrait que peu évoluer cette année. Le patronat du secteur, Syntec Numérique, ne prévoit en effet pas de créations d’emplois cette année et une nette baisse des recrutements.

Android has become a hedge against Microsoft and Windows

publié le 24 mai 2013, 00:32 par Pascal Fares

HP, in a way, is putting Microsoft and Windows on notice with its new Android offerings.

 May 18, 2013 1:57 PM PDT

HP SlateBook x2 is both an Android tablet and laptop. The laptop part is an Android first for HP.

HP SlateBook x2 is both an Android tablet and laptop. The laptop part is an Android first for HP.

(Credit: Hewlett-Packard)

Hewlett-Packard rolled out another Android device this week. This could become a pattern as PC makers hedge against a world that's less about Microsoft and more about Google.

On Tuesday, the largest PC maker in the world -- a dubious distinction these days -- added a laptop-tablet hybrid to its growing stable of products based on Google operating systems.

The $479 HP SlateBook x2 is an Android first for HP. It's "powered by Android, the world's most popular mobile operating system...100 percent tablet, 100 percent notebook, 100 percent Android," according to the company's ad copy.

The operative phrase is "most popular mobile operating system." HP knows that mobile, not desktop, OSes are where things are headed.

Don't expect HP to stop there. Android is a force of nature that's only going to get bigger and more important.This follows the announcement of an HP Chromebook and the Slate 7 Android tablet in February.

Asus, another big Windows PC maker, is leaning more on Android these days too. It makes the popular Nexus 7 for Google (second-generation 7 is due soon), its Transformer Pad has been well received, and Asus came out with an Intel-based Android FonePad recently.

And Acer, after whining incessantly about Microsoft's foray into the PC business via Surface, has been busy introducing its share of Android devices, like its most recent entrant, the Iconia A1.

All of the above "PC makers" will continue to make Windows laptops, hybrids, and tablets (HP also announced the Windows 8-based Split x2 this week), but the market momentum is in Android's favor.

HP's 14-inch Chromebook is a steal at only $330.

HP's 14-inch Chromebook is a steal at only $330.

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