Gunrock: GPU Graph Analytics

For large-scale graph analytics on the GPU, the irregularity of data access and control flow, and the complexity of programming GPUs, have presented two significant challenges to developing a programmable high-performance graph library. "Gunrock", our graph-processing system designed specifically for the GPU, uses a high-level, bulk-synchronous, data-centric abstraction focused on operations on a vertex or edge frontier. Gunrock achieves a balance between performance and expressiveness by coupling high performance GPU computing primitives and optimization strategies with a high-level programming model that allows programmers to quickly develop new graph primitives with small code size and minimal GPU programming knowledge. We characterize the performance of various optimization strategies and evaluate Gunrock's overall performance on different GPU architectures on a wide range of graph primitives that span from traversal-based algorithms and ranking algorithms, to triangle counting and bipartite-graph-based algorithms. The results show that on a single GPU, Gunrock has on average at least an order of magnitude speedup over Boost and PowerGraph, comparable performance to the fastest GPU hardwired primitives and CPU shared-memory graph libraries such as Ligra and Galois, and better performance than any other GPU high-level graph library.Comment: 52 pages, invited paper to ACM Transactions on Parallel Computing (TOPC), an extended version of PPoPP'16 paper "Gunrock: A High-Performance Graph Processing Library on the GPU

The Grizzly, March 21, 2000

Bridge Over Troubled Waters: ZX Pledging Activities Leave Fraternity, Two Students Suspended • Memories: Under Construction • Behe Lecture Sparks Scientific Debate • UC Democrats Give Donation to Cityspace • 2000 Edition of Who\u27s Who Announced • Alternative Spring Break: The Best Decision of My Life • The Barto Hotel Jam Night • Lacrosse Prepares for Repeat Title Hopes • Golf Team Looking to Capture CC Title • Softball Off to Commanding Start of Season • Spring is Here, and the UC Bats are Swinging • Baseball Tops Widener in Home Opener, 8-4 • Track & Field Jump Starts Spring Season • Injury-Stricken Gymnasts Pull Out Third at ECAC\u27s • Sports Profile: Taryn Brackinhttps://digitalcommons.ursinus.edu/grizzlynews/1462/thumbnail.jp

Four Weeks of Probiotic Supplementation Alters the Metabolic Perturbations Induced by Marathon Running: Insight from Metabolomics

Few data are available that describe how probiotics influence systemic metabolism during endurance exercise. Metabolomic profiling of endurance athletes will elucidate mechanisms by which probiotics may confer benefits to the athlete. In this study, twenty-four runners (20 male, 4 female) were block randomised into two groups using a double-blind matched-pairs design according to their most recent Marathon performance. Runners were assigned to 28-days of supplementation with a multi-strain probiotic (PRO) or a placebo (PLB). Following 28-days of supplementation, runners performed a competitive track Marathon race. Venous blood samples and muscle biopsies (vastus lateralis) were collected on the morning of the race and immediately post-race. Samples were subsequently analysed by untargeted 1H-NMR metabolomics. Principal component analysis (PCA) identified a greater difference in the post-Marathon serum metabolome in the PLB group vs. PRO. Univariate tests identified 17 non-overlapped metabolites in PLB, whereas only seven were identified in PRO. By building a PLS-DA model of two components, we revealed combinations of metabolites able to discriminate between PLB and PRO post-Marathon. PCA of muscle biopsies demonstrated no discernible difference post-Marathon between treatment groups. In conclusion, 28-days of probiotic supplementation alters the metabolic perturbations induced by a Marathon. Such findings may be related to maintaining the integrity of the gut during endurance exercise

The Grizzly, February 15, 2000

UC Students Debate Pros, Cons of Pledging On Campus • Feelings of Brotherhood, Sisterhood Prevalent During Pledging Process • Employment Available for Graduating Seniors • True Love: Sorrow and Devotion • Hackers, Hijackers, and the Wide World of Sports • The Greeks Agree: Pledges Have no Free Will • Pledging: What\u27s the Big Deal Anyway? • muMs Schemes at Ursinus • Pat McGee to Jam at Ursinus • Music Review: The Alligator Blues Band • Gymnastics Tops RIC with Season High Score • Intramural 3 on 3 Action: Brains vs. Brute • Indoor Track Steps Up to Eight Way Challenge • Ursinus Wrestling Battles for 4-1 • Sports Profile: Shana Goanehttps://digitalcommons.ursinus.edu/grizzlynews/1459/thumbnail.jp

The Grizzly, February 8, 2000

Main Street Traffic Problematic for UC Pedestrians • Low Injury Rate No Accident at UC Sporting Fields and Facilities • CIE Hailed a Success After Inaugural Semester • Race for the President Heats up in New Hampshire • Opinion: Pledging: Meaningless, Horrible; Freshman Perspective; Study Abroad Questions of Residence on Return • A Piano Starr • Music Review: The Deb Callahan Band • Summer Plans: Internship or Summer Job? • UC Women\u27s Basketball Still Confident for CC Win • Swimming Edged out by the Mawrters • Ursinus Gymnastics Ousts SUNY-Cortland • Wrestling Battles for 2-1 Week • Men\u27s Basketball Pounds CC Competitionhttps://digitalcommons.ursinus.edu/grizzlynews/1458/thumbnail.jp

Solar wind data assimilation in an operational context: use of near‐real‐time data and the forecast value of an L5 monitor

For accurate and timely space weather forecasting, advanced knowledge of the ambient solar wind is required, both for its direct impact on the magnetosphere and for accurately forecasting the propagation of coronal mass ejections to Earth. Data assimilation (DA) combines model output and observations to form an optimum estimation of reality. Initial experiments with assimilation of in situ solar wind speed observations suggest the potential for significant improvement in the forecast skill of near-Earth solar wind conditions. However, these experiments have assimilated science-quality observations, rather than near-real-time (NRT) data that would be available to an operational forecast scheme. Here, we assimilate both NRT and science observations from the Solar Terrestrial Relations Observatory (STEREO) and near-Earth observations from the Advanced Composition Explorer and Deep Space Climate Observatory spacecraft. We show that solar wind speed forecasts using NRT data are comparable to those based on science-level data. This suggests that an operational solar wind DA scheme would provide significant forecast improvement, with reduction in the mean absolute error of solar wind speed around 46% over forecasts without DA. With a proposed space weather monitor planned for the L5 Lagrange point, we also quantify the solar wind forecast gain expected from L5 observations alongside existing observations from L1. This is achieved using configurations of the STEREO and L1 spacecraft. There is a 15% improvement for forecast lead times of less than 5 days when observations from L5 are assimilated alongside those from L1, compared to assimilation of L1 observations alone

Making sense of science under conditions of complexity and uncertainty

Science advice to today’s policymakers has become more prominent than ever, due primarily to the growing human impact on our world, and the everincreasing complexity of the knowledge needed for coping with economic, social and environmental challenges. These include demographic changes, global trade issues, international market structures, transboundary pollution, digitalisation, urbanisation and many other factors of modern life. Many such policy problems are characterised by a mixture of complexity, uncertainty and ambiguity. The issues for which scientific input is most needed by policymakers are the ones for which the science is most often complex, multidisciplinary and incomplete. Scientific expertise supports effective policymaking by providing the best available knowledge, which can then be used to understand a specific problem, generate and evaluate policy options, and provide meaning to the discussion around critical topics within society. Scientific knowledge is crucial to ensuring that systematic evidence is part of the collective decisionmaking process. Systematic knowledge is instrumental to understanding phenomena, providing insights that help to understand and tackle society’s problems. Science therefore represents an essential element in Europe’s future development of policy. The nature of science advice is wide-ranging. The science advisory ecosystem includes a broad set of players, from individual academics to national academies, universities, think tanks and many others. Their roles include knowledge generation, synthesis, brokering, policy evaluation, horizon scanning and more. In the vast majority of policy cases, scientific advice is only one of many inputs but it occupies a unique position, as summarised below and in the report

The Grizzly, February 1, 2000

A Burning Question: Recent Rash of Fatal College Fires Sparks UC Students to Ask, Are We Safe? • Ursinus Struck Twice More with Ice, Rain and Snow • St. Louis Super in Clash with Titans • Grizzly Library Goes Virtual • Dickinson College Librarian Finally Free from Exile in Chinese Prison • Study Abroad Experience Proves to be a Valuable One • Opinion: After Iowa, Throw out the Rulebook, it\u27s Anybody\u27s Game; Where\u27s the Juice in Juice? • Meistersingers Tour Europe • Career Services Introduces Experience • Swimming Gears Up for Champs • Pair of Losses for UC • Bears Struggle in Conference Play • The Flud Warning • Ursinus Gymnastics Tramples Brockport • Sports Profile: Luther Owenshttps://digitalcommons.ursinus.edu/grizzlynews/1457/thumbnail.jp

The Grizzly, February 22, 2000

Black History Celebrated Across Ursinus Campus • Greeks Fall Under Scrutiny • Arts Program to Expand at UC • Nobel Laureate Lecture Draws Positive Student Response • Littleton, Letterman and the South Carolina Primary • After South Carolina: Can McCain be the Man for the GOP? • Pledging Debate Continues: The Problem of Hazing • Pat McGee: Pseudo DMB? • Valentine\u27s Day Blues • Tumbling and Dancing with Words • Music Review: Dr. John • Glah, Druckenmiller Shine at CC Swimming Championships • UC Wrestling Falls Short in Centennial Championships • UC Spring Sports Preview • Gymnastics Trounces School Record at Marranca Invitational • Men\u27s Basketball Ends Stellar Season • Sports Profile: Christopher Ciuncihttps://digitalcommons.ursinus.edu/grizzlynews/1460/thumbnail.jp