Optimizing CMS build infrastructure via Apache Mesos

The Offline Software of the CMS Experiment at the Large Hadron Collider (LHC) at CERN consists of 6M lines of in-house code, developed over a decade by nearly 1000 physicists, as well as a comparable amount of general use open-source code. A critical ingredient to the success of the construction and early operation of the WLCG was the convergence, around the year 2000, on the use of a homogeneous environment of commodity x86-64 processors and Linux. Apache Mesos is a cluster manager that provides efficient resource isolation and sharing across distributed applications, or frameworks. It can run Hadoop, Jenkins, Spark, Aurora, and other applications on a dynamically shared pool of nodes. We present how we migrated our continuos integration system to schedule jobs on a relatively small Apache Mesos enabled cluster and how this resulted in better resource usage, higher peak performance and lower latency thanks to the dynamic scheduling capabilities of Mesos.Comment: Submitted to proceedings of the 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP2015), Okinawa, Japa

On dynamical bit sequences

Let X^{(k)}(t) = (X_1(t), ..., X_k(t)) denote a k-vector of i.i.d. random variables, each taking the values 1 or 0 with respective probabilities p and 1-p. As a process indexed by non-negative t, $X^{(k)}(t)$ is constructed--following Benjamini, Haggstrom, Peres, and Steif (2003)--so that it is strong Markov with invariant measure ((1-p)\delta_0+p\delta_1)^k. We derive sharp estimates for the probability that ``X_1(t)+...+X_k(t)=k-\ell for some t in F,'' where F \subset [0,1] is nonrandom and compact. We do this in two very different settings: (i) Where \ell is a constant; and (ii) Where \ell=k/2, k is even, and p=q=1/2. We prove that the probability is described by the Kolmogorov capacitance of F for case (i) and Howroyd's 1/2-dimensional box-dimension profiles for case (ii). We also present sample-path consequences, and a connection to capacities that answers a question of Benjamini et. al. (2003)Comment: 25 pages. This a substantial revision of an earlier paper. The material has been reorganized, and Theorem 1.3 is ne

Determining the Location of a Milk Condensing Plant in Tennessee

Given the increasing popularity of local foods and the desire to reduce shipping costs and carbon footprint, Tennessee-based dairy product producers are showing interest in sourcing fluid milk locally. Based on dairy farmer surveys, discussions with industry leaders, shipping distances, and transportation costs estimates, a mixed integer linear programming model is used to determine the optimal location of an in-state milk condensing plant. The objective is to minimize the total transportation costs of shipments of fluid milk from farms to the condensing plant plus the transportation cost of shipments of condensing plant products to further in-state processing. Twelve scenarios of the model were analyzed with Rutherford County consistently being found as the optimal, transportation cost-minimizing location

Litigation and settlement : new evidence from labor courts in Mexico

Using a newly assembled data set on procedures filed in Mexican labor tribunals, the authors of this paper study the determinants of final awards to workers. On average, workers recover less than 30 percent of their claim. The strongest result is that workers receive higher percentages of their claims in settlements than in trial judgments. It is also found that cases with multiple claimants against a single firm are less likely to be settled, which partially explains why workers involved in these procedures receive lower percentages of their claims. Finally, the authors find evidence that a worker who exaggerates his or her claim is less likely to settle.Bankruptcy and Resolution of Financial Distress,Arbitration,Information Security&Privacy,Labor Markets,Judicial System Reform

Financial Crisis, Health Outcomes and Aging: Mexico in the 1980s and 1990s

We study the impact of economic crisis on health in Mexico. There have been four wide-scale economic crises in Mexico in the past two decades, the most recent in 1995-96. We find that mortality rates for the very young and the elderly increase or decline less rapidly in crisis years as compared with non-crisis years. In late 1995-96 crisis, mortality rates were about 5 to 7 percent higher in the crisis years compared to the years just prior to the crisis. This translates into a 0.4 percent increase in mortality for the elderly and a 0.06 percent increase in mortality for the very young. We find tentative evidence that economic crises affect mortality by reducing incomes and possibly by placing a greater burden on the medical sector, but not by forcing less healthy members of the population to work or by forcing primary caregivers to go to work.

Sustainable banking: the role of multilateral development banks as norm entrepreneurs

This article explores the role of multilateral development banks (MDBs) in originating norms of sustainable banking that have attracted and supported green private finance, a role not widely known in the management literature. Any prospect of achieving the United Nations (UN) Sustainable Development Goals by 2030 presupposes mobilizing the estimated US$23.3 trillion currently locked‐up in risk‐averse private savings to bridge the gap between developing countries’ demand for capital and the current global financial architecture’s capacity to supply it. The three biggest obstacles to sustainable banking identified by the authors are discussed: (1) The uncertain bankability of projects; (2) non‐transparency in tracking sustainable capital flows; and (3) no universal mechanism capable of making matches between green investment supply and demand; and what MDBs have actually done to overcome these roadblocks, and might do in future, is also discussed. Seen through the lens of “applied constructivism”, MDBs are revealed to be norm entrepreneurs proactive since at least the 1970s in socially constructing most of the basic norms and practices of sustainable banking which the private sector relies on or is now striving to take up. MDBs are typically the first “port of call” for international governmental organizations (IGOs) and civil society organizations wishing to establish a sustainable financial framework for development; and are the likeliest political agents to pioneer sustainable banking in future. MDBs would do well to develop an awareness of the methods of Constructivism, which they have actually been unwittingly using, to empower themselves to meet the challenges of the 21st centur

An assessment of Multilevel Governance in Cohesion Policy, 2007-2013

This study offers a thorough overview of Multi-Level Governance in Cohesion Policy in the current programming period of 2007-2013 by examining the evolution of the concept in terms of its definition and conceptual framework, analysing the current processes of implementing Multi-Level Governance in the EU27, as well as describing the advantages and disadvantages of partnerships in policy-making. Moreover, the study aims to formulate strategic and operational recommendations in the context of the preparation of the 2014- 2020 programming perio

Entry Level Technology Positions: No Degree Required

Employers demand for skilled technology workers has never been higher. Opportunities for individuals interested in working in technology to acquire the requisite skills have expanded to meet the increased demand. The expansion of training offerings calls into question the quality of new ventures such as coding academies and the necessity of traditional academic pathways. This research addresses concerns by exploring how employers value different forms of skill acquisition within the information technology environment defined as: academic degrees, certifications, and work experience. IT executives and HR managers surveyed give insight into how they relatively value the various sources for their new and experienced employees. Using non-parametric methods and correspondence analysis, an overall picture of employers’ valuations were obtained. Additionally, subsections were analyzed across employer size and industry type. Results from the analysis identified expected general valuations by the employers. However, employer responses to the valuations identified unexpected actions that have potential negative impacts on institutions of higher education

An Examination of the Effect of Continuous Quality Improvements on Optimal Pricing for Durable Goods

This paper investigates the nature of optimal prices for a durable good in the presence of continuous quality improvements. The analysis of optimal prices is based on a nonlinear dynamic model of sales response that relates price, quality, average life of a product and the persistence of quality perceptions. Numerical solutions to the model are derived by employing the generalized reduced gradient algorithm. The results show that optimal price depends on the persistence of quality perceptions and the average life of a product (an aspect of quality). The analysis of optimal results affirms results based on other models and provides insights on the influence that quality has on optimal pricing. The implications of the results and suggestions for future research are discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/71882/1/j.1540-5915.1996.tb00858.x.pd