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 ...
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."
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.
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 ...
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.’