Supporting the Global Arrays PGAS Model Using MPI One-Sided Communication

2012 ◽  
Author(s):  
James Dinan ◽  
Pavan Balaji ◽  
Jeff R. Hammond ◽  
Sriram Krishnamoorthy ◽  
Vinod Tipparaju
Keyword(s):  
Global Arrays

Global Arrays Parallel Programming Toolkit

2011 ◽  
pp. 779-787
Author(s):  
Ananth Kalyanaraman ◽  
Kevin Hammond ◽  
Jarek Nieplocha † ◽  
Manojkumar Krishnan ◽  
Bruce Palmer ◽  
...  
Keyword(s):  
Parallel Programming ◽  
Global Arrays

Global Arrays

2011 ◽  
pp. 779-779
Author(s):  
Ananth Kalyanaraman ◽  
Kevin Hammond ◽  
Jarek Nieplocha † ◽  
Manojkumar Krishnan ◽  
Bruce Palmer ◽  
...  
Keyword(s):  
Global Arrays

scholarly journals Atmospheric radiative transfer through global arrays of 2D clouds

2005 ◽  
Vol 32 (19) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. N. S. Cole ◽  
H. W. Barker ◽  
W. O'Hirok ◽  
E. E. Clothiaux ◽  
M. F. Khairoutdinov ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Global Arrays ◽  
Atmospheric Radiative Transfer

scholarly journals PKS 1117+146: Gravitational Lens or Micro lobes

1996 ◽  
Vol 175 ◽  
pp. 118-119
Author(s):  
M. Bondi ◽  
M. Garrett ◽  
L. Gurvits
Keyword(s):  
Gravitational Lensing ◽  
Hot Spot ◽  
Low Frequency ◽  
Gravitational Lens ◽  
Central Component ◽  
Radio Sources ◽  
Double Structure ◽  
Global Arrays ◽  
Low Frequency Variability ◽  
First Time

PKS 1117+146 is a high power radio source (L327MHz=5.4 × 1026 W/Hz) identified with a galaxy of 20.1 red magnitude at z=0.362 (de Vries et al. 1995). At this redshift 1 mas ≃ 2.9 pc (H0 = 100 km/s–1Mpc–1). Based on the properties of the radio spectra, PKS 1117+146 is classified as a GigaHertz Peaked Spectrum source (GPS) (Stanghellini et al. 1990). The GPS are powerful but physically small (sub-galactic sizes) radio sources with turnovers in their radio spectra at v ≃ 1 GHz. They are supposed to be isotropically emitting radio sources confined by exceptional dense circumnuclear gas (O'Dea et al. 1991) or still relatively young (Fanti et al. 1990). PKS 1117+146 is also a low frequency variable (LFV) with no sign of variability at v > 1 GHz (Padrielli et al. 1987, Mitchell et al. 1994). The low frequency variability is caused by propagation effects in the interstellar medium of our Galaxy (Mantovani et al. 1990, Spangler et al. 1993). PKS 1117+146 was observed with VLBI global arrays at 608 MHz (Padrielli et al. 1991), at 327 MHz (Altschuler et al. 1995), and at 1667 MHz (Bondi et al. 1996). All the maps are in agreement showing a compact double structure with components separated by about 70 mas. Flux densities and separation of the two components derived from VLBI and MERLIN (see below) maps are listed in Table 1. The flux ratios of the two components from the VLBI observations are very similar, and the spectral index is relatively flat (α ≃ 0.3–0.4), even if the strong low frequency variability can introduce uncertainties. The similarity of the VLBI morphology and spectral properties of the two components suggested that 1117+146 could be a possible gravitational lens candidate prompting for higher frequency observations. We observed PKS 1117+146 with MERLIN at 22 GHz in March 1993. MERLIN observations reveal for the first time a weak central component with a total flux density of about 20 mJy (Fig.1). From Table 1 we can note that the P.A. between the components is constant at all the frequencies while the separation between the peak flux densities significantly increases at higher frequencies. This is the expected behaviour if the 2 components are 2 lobes with hot-spot at the outer edges. The MERLIN map at 22 GHz seems to rule out the possibility that the morphology of PKS 1117+146 is caused by gravitational lensing.

scholarly journals Recent VLBA/VERA/IVS tests of general relativity

2009 ◽  
Vol 5 (S261) ◽  
pp. 291-295 ◽  
Author(s):  
Ed Fomalont ◽  
Sergei Kopeikin ◽  
Dayton Jones ◽  
Mareki Honma ◽  
Oleg Titov
Keyword(s):  
General Relativity ◽  
Gravitational Field ◽  
Radio Sources ◽  
Positional Accuracy ◽  
Tests Of General Relativity ◽  
Global Arrays ◽  
The Future

AbstractWe report on recent VLBA/VERA/IVS observational tests of General Relativity. First, we will summarize the results from the 2005 VLBA experiment that determined gamma with an accuracy of 0.0003 by measuring the deflection of four compact radio sources by the solar gravitational field. We discuss the limits of precision that can be obtained with VLBA experiments in the future. We describe recent experiments using the three global arrays to measure the aberration of gravity when Jupiter and Saturn passed within a few arcmin of bright radio sources. These reductions are still in progress, but the anticipated positional accuracy of the VLBA experiment may be about 0.01 mas.

Parallel programming using the global arrays toolkit: now and into the future

2011 ◽  
Author(s):  
Bruce Palmer ◽  
Manojkumar Krishan ◽  
Abhinav Vishnu
Keyword(s):  
Parallel Programming ◽  
Global Arrays ◽  
The Future

scholarly journals Advances, Applications and Performance of the Global Arrays Shared Memory Programming Toolkit

2006 ◽  
Vol 20 (2) ◽  
pp. 203-231 ◽  
Author(s):  
Jarek Nieplocha ◽  
Bruce Palmer ◽  
Vinod Tipparaju ◽  
Manojkumar Krishnan ◽  
Harold Trease ◽  
...  
Keyword(s):  
Shared Memory ◽  
Global Arrays ◽  
And Performance

scholarly journals Using Global Arrays to Investigate Internal-Waves and Mixing

2010 ◽  
Author(s):  
Jennifer MacKinnon ◽  
Jennifer MacKinnon ◽  
Jennifer MacKinnon ◽  
Jennifer MacKinnon ◽  
Jennifer MacKinnon ◽  
...  
Keyword(s):  
Internal Waves ◽  
Global Arrays

scholarly journals Parallel Distributed Hydrology Soil Vegetation Model (DHSVM) using global arrays

2019 ◽  
Vol 122 ◽  
pp. 104533 ◽  
Author(s):  
William A. Perkins ◽  
Zhuoran Duan ◽  
Ning Sun ◽  
Mark S. Wigmosta ◽  
Marshall C. Richmond ◽  
...  
Keyword(s):  
Vegetation Model ◽  
Global Arrays
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