72 research outputs found
Demonstrating 100 Gbps in and out of the public Clouds
There is increased awareness and recognition that public Cloud providers do
provide capabilities not found elsewhere, with elasticity being a major driver.
The value of elastic scaling is however tightly coupled to the capabilities of
the networks that connect all involved resources, both in the public Clouds and
at the various research institutions. This paper presents results of
measurements involving file transfers inside public Cloud providers, fetching
data from on-prem resources into public Cloud instances and fetching data from
public Cloud storage into on-prem nodes. The networking of the three major
Cloud providers, namely Amazon Web Services, Microsoft Azure and the Google
Cloud Platform, has been benchmarked. The on-prem nodes were managed by either
the Pacific Research Platform or located at the University of Wisconsin -
Madison. The observed sustained throughput was of the order of 100 Gbps in all
the tests moving data in and out of the public Clouds and throughput reaching
into the Tbps range for data movements inside the public Cloud providers
themselves. All the tests used HTTP as the transfer protocol.Comment: 4 pages, 6 figures, 3 table
CAMERA: A Community Resource for Metagenomics
The CAMERA (Cyberinfrastructure for Advanced Marine Microbial Ecology Research and Analysis) community database for metagenomic data deposition is an important first step in developing methods for monitoring microbial communities
The Collision of Two Black Holes
We study the head-on collision of two equal mass, nonrotating black holes. We
consider a range of cases from holes surrounded by a common horizon to holes
initially separated by about , where is the mass of each hole. We
determine the waveforms and energies radiated for both the and
waves resulting from the collision. In all cases studied the normal
modes of the final black hole dominate the spectrum. We also estimate
analytically the total gravitational radiation emitted, taking into account the
tidal heating of horizons using the membrane paradigm, and other effects. For
the first time we are able to compare analytic calculations, black hole
perturbation theory, and strong field, nonlinear numerical calculations for
this problem, and we find excellent agreement.Comment: 14 pages, 93-
The Head-On Collision of Two Equal Mass Black Holes Peter Anninos
We study the head-on collision of two equal mass, nonrotating black holes.
Various initial configurations are investigated, including holes which are
initially surrounded by a common apparent horizon to holes that are separated
by about , where is the mass of a single black hole. We have extracted
both and gravitational waveforms resulting from the
collision. The normal modes of the final black hole dominate the spectrum in
all cases studied. The total energy radiated is computed using several
independent methods, and is typically less than . We also discuss an
analytic approach to estimate the total gravitational radiation emitted in the
collision by generalizing point particle dynamics to account for the finite
size and internal dynamics of the two black holes. The effects of the tidal
deformations of the horizons are analysed using the membrane paradigm of black
holes. We find excellent agreement between the numerical results and the
analytic estimates.Comment: 33 pages, NCSA 94-048, WUGRAV-94-
Computing and data processing
The applications of computers and data processing to astronomy are discussed. Among the topics covered are the emerging national information infrastructure, workstations and supercomputers, supertelescopes, digital astronomy, astrophysics in a numerical laboratory, community software, archiving of ground-based observations, dynamical simulations of complex systems, plasma astrophysics, and the remote control of fourth dimension supercomputers
Internet Predictions
More than a dozen leading experts give their opinions on where the Internet is headed and where it will be in the next decade in terms of technology, policy, and applications. They cover topics ranging from the Internet of Things to climate change to the digital storage of the future. A summary of the articles is available in the Web extras section
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