The impact of friction on doing the right thing

Website Security – Interesting 65Gbps DDos Case Study

borg-net.eu
gratis dejting spel resultat
dejting 55 avstängd
vph-dare.eu
konek.eu
live chat service free
kurze sprüche zum 50 geburtstag einer frau
rencontres regionales love easy rencontre
rencontre tahiti love
incontri uomo roma
musiaked.com
rencontre billy montigny
funkar internet dejting råd
urdu chat room pakistani
obsharrybannink.nl
wikiport.de
les rencontres du management de projet
testshop.djurvision.se
partnersuche kiel umgebung
sportby.web-made.biz
russian dating website fotos
polkom.klebek.com.pl
lada-s-auto.ru
boomtrainingandconsultancy.nl
uomo cerca donna genova
fiebodenhoff.dk
betreuungsvz.de
abqactorsstudio.com
incontri per adulti a napoli
dejtingsajt för kriminella invandrare
wow la rencontre avec un tout puissant
bakteriy.net
dejtingsajt för par webbkryss
salutesport.net
porotherm.it
tryingtostartafire.com
roza26.ru
incontri a catania donna cerca uomo
best middle eastern dating site
sites de rencontre non payant pour les hommes
biconsultantgroup.com
driquet.com
find asian singles in uk
ug-traktor.ru
rencontre gérontologie pratique
bra profil på dejtingsida
chat senza registrazione incontri
ralf-gi.de
dejting appar 2014
mathebuch-online.de
italiensk dejtingsajt
trouver prostituée istanbul
lieux rencontre dreux
hajoepitok.hu
incontri donna perugia
online partnersuche absage
sottolecummerse.it
chat incontri free
recognition-products.eu
nätdejting 40 cm
adventchores.org
rencontre femmes celibataire usa
baby-chess.ru
frajole.de
hrstartpolska.pl
agefreelabs.net
gommit.com
wecanmakeyoufamous.com
brischke.de
lpdargentina.com.ar
transversal6.com
gagarin-auto.ru
rencontre mon bled gratuit
blogdomotelec.fr
spiralbindung.com
nätdejting dejta flera
chat rooms for singles in london
onlyquartz.ru
uomini cerca donne
lake-il.lftgoal.org
petit annonce rencontre femme
la rencontre roland dubillard
rencontre transsexuel au canada
journeyoffaithchurch.com
aquazond.ocean.ru
fond-opolchenie.ru
a0015450.xsph.ru
presentationstext dejting råd
galeria.zgodzio.pl
migliori chat per conoscere ragazze
dejtingsida usa
date latin definition
page18.fr
usluga-s-ru.1gb.ru
fpmetroatlanta.org
domingortega.es
mjc-massinon.fr
boom.lgbt
rencontre de foot ligue 1
ivemad.com
date app via facebook
gadbiblian.gob.ec
bakeca incontri donne prato
festival-cannes.ru
dzconfiance.com
elletta.eu
rencontre aumont aubrac
dejtingsidor för yngre jurister
rencontre austin mini
dejtingsajt som är gratis youtube
rencontres par facebook
bubble shooter 4 kostenlos online spielen
rencontre ma ville gueugnon
batalladetrafalgar.com
project free tv online dating rituals
coastline-west.com
daneslist.com
karwood.pl
att dejta en amerikan
jalinver.com
rencontre sur badoo ouahigouya
free online dating ireland
forbbq.ru
labrador-reproduktor.com
machtek.de
fvs-service.ru
nätdejting 20 år
rencontre guelma
tabelaciyiz.com
cad24.org
webs.890m.com
les sites de rencontres professionnelles
dongfeng.trec-avto.ru
rencontres vege
histoire site rencontre
annunci amicizia amore youtube
prostituées film entier complet en francais 2013 vf fr
sunshine-caravan-und-reisemobile.de
calypso-otel.ru
passion-polar.com
nätdejting samtalsämnen middag
site de rencontre ado lesbienne belgique
rencontre henri jean martin
sbstroy.ru
angeltour.ru
trophybook.ru
sekretar.ru
dejtingsajter recensioner böcker
comment contacter le site de rencontre tiilt
nätdejting under 18 malmö
mbaddiction.com
la rencontre meaning
buisnesshouse.ru
ealaayoune.com
rencontre auberchicourt
alarabia-national-schools.com
microfourmi.fr
partnersuche in bern helmets
madar.siedlce.pl
pizza.mvgkazan.ru
top singleplayer steam games
xn--tudentska-trgovina-frd.si
okno-sell.ru
incontri donne trento
beste single clubs berlin
numbrs-it.com
dejta stora kvinnor göteborg
uk single releases january 2015
computers174.ru
woodysoft.eu
seefels.co.at
bycure.it
partnervermittlung akademiker quereinsteiger
metar.it
kesgroup.ru
mi11.lt
a124locksmith.com
romantisk date forslag
eltais.ru
tutti i siti di incontro
site rencontre goth
ragdoll-italia.it
dubai prostituées russes
chatrooms ohne registrierung kostenlos schweiz
zeitmanagement spiele kostenlos spielen ohne anmeldung
buddhahaus-stuttgart.de
mojeeko.net
site de rencontre vive les rondes
woogoo site de rencontre
dejta svenska killar
wrtaxidermy.com
nätdejting västerås flygplats
free dating sites lubbock tx
exemple description homme site de rencontre
uniq-works.de
chat gratis sin registro colombia bogota
lam-italia.it
thehiphopanimal.com
towerhill.com.br
site rencontre gratuit prades

Software Development Life Cycle (SDLC) Case Study – Result = $440M Loss

Share this: [wpsr_retweet] [wpsr_plusone][wpsr_linkedin]

 

Software Development Life Cycle (SDLC)Importance

Solid Logic Technology’s foundershave experience across the financial industry and specifically in the development of quantative trading and investment systems. Many of the things we’ve learned along the way impact the way we develop software for clients across other industries. Most notably we’ve learned that software quality is extremely important and ‘software bugs’ cost lots of money. The study below shows how important in-depth software development, testing and launch management is for a company.

As early as August 1st, 2012 reports came out that Knight Capital Group,  a prominent electronic market-making firm specializing in NYSE equities, lost an estimated $440 million dollars due to a ‘software bug’. The news spread across financial news networks like Bloomberg, NY Times, CNBC and The Wall Street Journal.  Knight and other similar firms, trade US equities electronically using sophisticated computer algorithms with little to no human involvement in the process. While we will probably never hear the full story behind the ‘software bug’, it is suspected that a software coding error that was not quickly identified caused the loss. The loss is approximately 4 times their 2011 net income of $115m. It appears to have pretty much decimated the firm and at this point it looks like the firm will be bought or end up in bankruptcy.

While unfortunate, this example has some implications across any software project.

So what can we learn and take away from this incident?

  1. Software is not perfect, especially right after it is released
  2. A more comprehensive Software Development Life Cycle (SDLC) process and launch plan probably would have reduced the loss to a more reasonable amount.
  3. Always have a contingency plan for a new launch
  4. If new software is ‘acting funny’ then it probably has a problem and needs to be pulled from production and fixed
  5. When possible, conduct a series of small ‘pilots’ or ‘beta’ test along the way in a lower impact way
  6. If you cannot fully test the changes, then implement them slowly to minimize the potential errors in the beginning
  7. Have a ‘kill switch’ and know how to use it
  8. Have a formal SDLC process and follow it for all revisions
  9. Use source control for all software changes
  10. Have a defined launch process
  11. Have a way to quickly revert the changes implemented back to the previous version.

These are basic best practices that all software development firms should follow in order to consistently develop high quality software. Its unfortunate that there is a case study like this but these type of incidents are more common (but not to this scale) than most people imagine. I’m sure the group at Knight completed many of the above items, but something got away from them.

We put a huge amount of thought and effort into the process of software development and the consistent high level of quality that a solid process brings. We’re currently working on publishing a set of Software Development best practices – please contact us for a pre-release version.

More posts by Eric

[gravityform id=”4″ name=”Subscribe to our Blog” description=”false” ajax=”false”]

Share this: [wpsr_retweet] [wpsr_plusone][wpsr_linkedin]

Amazon EC2 Cloud Computing Cost Savings

This post is a long one and is part of an on-going series of some of the benefits we’ve identified in our experience in using Cloud Computing technologies, most notably Amazon Web Services (AWS) and different VMware products.

Overview

“The cloud”, specifically Amazon Web Services, has dramatically changed the landscape of High Performance Computing and Big Data Processing in recent years. Many things are computationally possible that would not have been a few short years ago. An organization can cost-effectively setup, launch and use a seemingly limitless amount of computing resources in minutes.

Most of the news media today is focused around using Hadoop on “Big Data”. SLTI has experience with this technology, but what happens if your task data set doesn’t fit nicely into this framework?? The writeup below is how we handled one such challenge.

Business Problem

The problem SLTI was trying to solve fits into the Business Intelligence/Data Mining area in the financial industry. The problem tested different inputs for an algorithm that is the basis for a quantitative equity trading system.
The algorithm had complex mathematical calculations and processing requirements across a large and diverse data set. The problem required testing a wide range of input parameters across four dimensions. The algorithm was tested across sixty-two different data sets. A summary of the size of the problem is shown to the right – We basically have to analyze 9.9 billion data points to come up with something actionable.

While the program logic is specific to the financial trading industry, it has many common concepts shared across different industries – engineering, legal services, etc. The question to ask is simple –Watch movie online The Transporter Refueled (2015)

How many processing tasks have you had that you wished ran faster? Can they be split into multiple pieces and run in parallel? How can this be done cost-effectively?

Information Technology and Software Solution

Cloud Computing has dramatically changed the cost landscape of IT Infrastructure, especially for prototype or short run projects like this one. In a general sense, CPU cycles and RAM are cheap compared to the highly skilled labor required to improve performance by several orders of magnitude.

Our goal was simple – make the program to run a lot faster with minimal effort.

We have a large list of projects to be completed so development time is our most precious resource so we didn’t want to re-write the entire program. We kept the software changes and technology solution simple – it’s basically an 80/20 approach to setup the infrastructure and handle the code changes that still solves the problem, albeit in a less elegant fashion.

To accomplish our goal, we modified the program  to operate on a user-defined subset of the original data set. This allows the problem to be split into many small parts and spread apart across multiple servers. We can then distribute the pieces to each server to handle the processing for that subset.  

IT Infrastructure Architecture

In staying with a 80/20 simple solution first approach, we created a solution with the following pieces:

  1. Linux based application server (Amazon EC2 Amazon Machine Image (AMI), alternatively a VMware image could be created and converted to an AMI.
  2. Highly-Available, scalable, central filestore (Amazon S3)
  3. Master configuration data stored in Amazon S3

The cluster itself is comprised of sixteen cc2.8xlarge EC2 instances. Each instance has 88 Compute Units, has 2 x Intel Xeon E5-2670 processors (16 cores per instance), 60.5GB of RAM, 3370GB storage. The cluster provided 1408 Compute Units, 256 Cores and 968 GB of RAM.

The basic logic of the program goes something like this

  1. Load all required data into Amazon S3
  2. Launch the pre-configured AMI to run the program after the server launches
    • Get a specific subset of the data for the node from the central filestore
    • Update the master configuration data to notify the other nodes what data still needs to be processed before, during and after each test run.
    • Save the results to the central filestore
    • Shutdown the node after the work is completed

Cost Analysis

This is not intended to be a totally comprehensive cost comparison but rather a quick TCO comparison using some standard costs. To quickly do this, we used the AWS EC2 Cost Comparison Calculator on the bottom of this page.

SLTI’s EC2 based approach is roughly 99.5% cheaper than an in-house solution.  There are other similar examples of the ROI of an EC2 based approach for this type of workload here 

Key Takeaways

  1. Using the cloud enables a much more adaptive and scalable data processing infrastructure than in-house IT hardware.
  2. If you’re not using AWS (or something similar), you’re overpaying for IT infrastructure, especially for short run or highly variable workloads.

This post is a short overview on some of the ways we’re using advanced cloud computing technology to help our clients improve their IT agility and reduce IT expenses. We’re currently working on a few case studies that describe these concepts in more detail. To get updated with new research just sign up using the form on the right of this page.

If you’d like to explore a specific use case for your situation – please contact us

[gravityform id=”4″ name=”Subscribe to our Blog” description=”false” ajax=”false”]

Cloud Computing Categories

This post is the second in an on-going series of some of the benefits we’ve identified in our experience in using Cloud Computing technologies, most notably Amazon Web Services (AWS) & different VMware products. The first post focused on some of the financial benefits and cash flow impacts of technologies we use on all client projects.  This post will introduce some differences between “cloud computing” technologies in order to set the statge to discuss how the products in those categories can be used and some of the benefits of them.

Cloud Computing Definitions & Categories

Because “the cloud” is a very vague and overused term these days – we need first define some things before diving into the impact and benefits of them. In the interest of time, we’ll use a summary of Wikipedia’s definitions rather than creating our own.

Virtualization – “In computing, virtualization (or virtualisation) is the creation of a virtual (rather than actual) version of something, such as a hardware platform, operating system, storage device, or network resources.” The most notable example of this software is made by VMware (ESX, Workstation, etc.).

Source: http://en.wikipedia.org/wiki/Virtualization

Cloud Computing & Infrastructure As A Service (IaaS) – “Cloud computing refers to the delivery of computing and storage capacity[citation needed] as a service to a heterogeneous community of end-recipients. The name comes from the use of clouds as an abstraction for the complex infrastructure it contains in system diagrams[citation needed]. Cloud computing entrusts services with a user’s data, software and computation over a network.”  Amazon Web Services (AWS), Rackspace, etc doxycycline tablets 50mg. would fall under this category.

Source: http://en.wikipedia.org/wiki/Cloud_computing &

Platform As A Service (PaaS) – “Platform as a service (PaaS) is a category of cloud computing services that provide a computing platform and a solution stack as a service. Along with SaaS and IaaS, it is a service model of cloud computing. In this model, the consumer creates the software using tools and libraries from the provider. The consumer also controls software deployment and configuration settings. The provider provides the networks, servers and storage.” Heroku, PHPFog, AppFog, etc would fit into this category.

Source: http://en.wikipedia.org/wiki/Platform_as_a_service

Cloud Computing Technology Stages

These categories have been introduced over the past nine or so years and have matured considerably in recent years. Many of the products that we looked at a year ago and felt were not ready for prime time are now ready Our use of cloud computing technology has matured considerably and we’ve followed the path shown in the diagram below.

Our preference at this point is to use a Platform-As-A-Service where appropriate. When that is not possible, we’ll use a customized configuration running on Amazon Web Services or another cloud provider.  In the next post we’ll discuss some of the benefits of this approach and the impact these decisions have had on our development process.

[gravityform id=”4″ name=”Subscribe to our Blog” description=”false” ajax=”false”]