jm + simulation   9

The right-wing history of the urban models which inspired SimCity
Largely forgotten now, Jay Forrester’s Urban Dynamics put forth the controversial claim that the overwhelming majority of American urban policy was not only misguided but that these policies aggravated the very problems that they were intended to solve. In place of Great Society-style welfare programs, Forrester argued that cities should take a less interventionist approach to the problems of urban poverty and blight, and instead encourage revitalization indirectly through incentives for businesses and for the professional class. Forrester’s message proved popular among conservative and libertarian writers, Nixon Administration officials, and other critics of the Great Society for its hands-off approach to urban policy. This outlook, supposedly backed up by computer models, remains highly influential among establishment pundits and policymakers today.
simulation  cities  society  politics  history  simcity  games  jay-forrester  will-wright  sociology 
23 days ago by jm
We planned for Brexit at Football Manager. So why did no one else? | Miles Jacobson | Opinion | The Guardian
Football Manager includes what is effectively a parallel universe, so they modelled the effects of Brexit on the UK Premier League:

'In my own current “save”, Brexit kicked in at the end of season three. Unfortunately I got one of the hard options, where all non-homegrown players are now going through a work permit system, albeit one that’s slightly relaxed. It means I can no longer bring in that 19-year-old Italian keeper I’d been eyeing up as one for the future. Instead I have to wait for him to break into the Italian squad, and play 30% of their fixtures over the next two years. Then he’ll be mine. Meanwhile, my TV revenue has just dropped by a few million. Let’s hope that doesn’t continue, or I won’t even be able to afford him.'
brexit  uk  games  gaming  football-manager  forecasts  simulation 
november 2016 by jm
Performance Testing at LMAX
Good series of blog posts on the LMAX trading platform's performance testing strategy -- they capture live traffic off the wire, then build statistical models simulating its features. See also http://epickrram.blogspot.co.uk/2014/07/performance-testing-at-lmax-part-two.html and http://epickrram.blogspot.co.uk/2014/08/performance-testing-at-lmax-part-three.html .
performance  testing  tests  simulation  latency  lmax  trading  sniffing  packet-capture 
june 2015 by jm
How Curiosity, Luck, and the Flip of a Switch Saved the Moon Program | Motherboard
"SCE to off?" someone said. The switch was so obscure that neither of his bosses knew what he was talking about. "What the hell's that," blurted out Gerald Carr, who was in charge of communicating with the capsule. The rookie flight director, Gerry Griffin, didn't know either.

Sixty seconds had passed since the initial lightning strike. No one else knew what to do. The call to abort was fast approaching. 

Finally, Carr reluctantly gave the order in a voice far cooler than the moment. "Apollo 12, Houston, try SCE to Auxiliary, over."
spaceflight  stories  apollo  sce-to-aux  power  lightning  weather  outages  simulation  training  nasa 
november 2014 by jm
Flood IO Offering Network Emulation
Performance-testing-as-a-service company Flood.IO now offering emulation of various crappy end-user networks: GSM, DSL, GPRS, 3G, 4G etc. Great idea.
flood.io  performance  networking  internet  load-testing  testing  jmeter  gatling  tests  gsm  3g  mobile  simulation 
april 2014 by jm
'Experience of software engineers using TLA+, PlusCal and TLC' [slides] [pdf]
by Chris Newcombe, an AWS principal engineer. Several Amazonians sharing their results in simulating tricky distributed-systems problems using formal methods
tla+  pluscal  tlc  formal-methods  simulation  proving  aws  amazon  architecture  design 
october 2013 by jm
Telehack: May the command line live forever
'Connected to TELEHACK port 13 / It is 8:16 am on Saturday, April 30, 2011 in Mountain View, California, USA. There are 10 local users. There are 24139 hosts on the network.' via Waxy
via:waxy  simulation  history  telnet  arpanet  networking  unix  bbs 
june 2011 by jm
Bunnie Huang on the simulated 6502
'It makes my head spin to think that the CPU from the first real computer I used, the Apple II, is now simulateable at the mask level as a browser plug-in. Nothing to install, and it’s Open-licensed. How far we have come…a little more than a decade ago, completing a project like this would have resulted in a couple PhDs being awarded, or regarded as trade secret by some big EDA vendor. This is just unreal…but very cool!'
simulation  bunnie-huang  6502  cpu  chips  emulation  hardware  from delicious
september 2010 by jm
www.Visual6502.org
'working from a single 6502, we exposed the silicon die, photographed its surface at high resolution and also photographed its substrate. Using these two highly detailed aligned photographs, we created vector polygon models of each of the chip's physical components - about 20,000 of them in total for the 6502. These components form circuits in a few simple ways according to how they contact each other, so by intersecting our polygons, we were able to create a complete digital model and transistor-level simulation of the chip. This model is very accurate and can run classic 6502 programs, including Atari games. By rendering our polygons with colors corresponding to their 'high' or 'low' logic state, we can show, visually, exactly how the chip operates: how it reads data and instructions from memory, how its registers and internal busses operate, and how toggling a single input pin (the 'clock') on and off drives the entire chip to step through a program and get things done.' Awesome
6502  emulation  physics  simulation  mos  atari-2600  pet  commodore  c-64  cpu  silicon  from delicious
september 2010 by jm

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