Revisiting Amdahl's Law
An anonymous reader writes "A German computer scientist is taking a fresh look at the 46-year old Amdahl's law, which took a first look at limitations in parallel computing with respect to serial computing. The fresh look considers software development models as a way to overcome parallel computing limitations. 'DEEP keeps the code parts of a simulation that can only be parallelized up to a concurrency of p = L on a Cluster Computer equipped with fast general purpose processors. The highly parallelizable parts of the simulation are run on a massively parallel Booster-system with a concurrency of p = H, H >> L. The booster is equipped with many-core Xeon Phi processors and connected by a 3D-torus network of sub-microsecond latency based on EXTOLL technology. The DEEP system software allows to dynamically distribute the tasks to the most appropriate parts of the hardware in order to achieve highest computational efficiency.' Amdahl's law has been revisited many times, most notably by ...
amdahl
booster-system
concurrency
d-torus
development
efficiency
extoll
german
gustafson
john
latency
limitations
phi
revisiting
scientists
simulation
technology
xeon
Echolocation For Your Cell Phone
sciencehabit writes "In a few years, an iPhone app may give you a 3D layout of a room as soon as you step into it. Researchers have developed an algorithm that spits out the shape and contours of complex structures (including Switzerland's Lausanne Cathedral) using data compiled from four randomly placed microphones. The technology, which relies on the same sort of echolocation bats and dolphins use to navigate, could be used to develop more realistic echoes in video games and virtual reality simulations and to eliminate the echo from phone calls."
cathedral
echolocation
iphone
lausanne
reality
simulation
switzerland
technology
NASA video simulates interior of stellar-mass black hole
NASA's super computer simulation allows you to peer into the inner zone of the accretion disk of a stellar-mass black hole. The simulation is based on a new study by astronomers at NASA, John Hopkins University and the Rochester Institute of Technology.
accretion
hopkins
institute
john
nasa
rochester
simulation
technology
university
On Spying, A Deficit Of Trust
After it was revealed that the National Security Administration was collecting phone records of every single U.S. call on the Verizon network, even President Obama’s most ardent supporters are losing faith that he would usher in a more transparent government. Loyal Democrat, former Vice President and Internet inventor, Al Gore called the NSA’s massive spying program ”obscenely outrageous”. Americans have always accepted the necessary evil of secrecy to protect citizens, but a disturbing trend in politically motivated security scandals has eroded the trust that justifies secrecy in the democracy. As a result, there hasn’t been enough public support for Congress to update our badly antiquated cybersecurity laws. Secrecy is not an unlimited free pass for wonton privacy invasion: the government has to prove, at least somewhat regularly, that the good outweighs the bad. Unfortunately, we have been presented with little evidence that massive spying operations are producing the intended ...
administration
al-qaeda
americans
bradley manning
congress
cybersecurity
democracy
democrat
emergency
eugene
evidence
fidell
fortunately
gore
government
information
intelligence
internet
intrusion
invasion
investigation
journalism
journalists
legislation
national security
nsa
oped
operations
opinion
possibility
president obama
privacy
secrecy
simulation
transportation
unfortunately
verizon
wall street journal
wikileaks
yale
How language works: Louder Than Words. How the mind makes meaning
Ever wondered how we make sense of language? Ben Berger’s book, “Louder Than Words: The New Science of How The Mind Makes Meaning” offers a new approach as to how we come to understand language through a process known as ‘embodied simulation.’
ben
berger
science
simulation