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An UltraScale System (USS) joins parallel and distributed computing systems that will be two to three orders of magnitude larger than today's infrastructure regarding scale, performance, the number of components and their complexity. For such systems to become a reality, however, advances must be made in HPC, large-scale distributed systems, and bi...

Due to the increasing complexity of the processors, developers often seek for tools that would simplify the process of finding bottlenecks while executing applications. Although more and more data may be collected from processors, usually much detailed knowledge about the internals of a given architecture is required to understand them. This paper...

The paper concerns the optimization problem arising in charitable organizations during supply process. Such institutions are especially interested in minimizing the cost of purchase which consists of the prices at which particular products are bought as well as of the cost of their transportation. We present the formal mathematical model of the pro...

The need to improve how efficiently data centre operate is increasing due to the continued high demand for new data centre capacity combined with other factors such as the increased competition for energy resources. The financial crisis may have dampened data centre demand temporarily, but current projections indicate strong growth ahead. By 2020,...

Nowadays, moderating energy consumption and building eco-friendly computing infrastructure is a major goal in large data centers. Moreover, data center energy usage has risen dramatically over the past decade and will continue to grow in-step with the High Performance Computing (HPC) intensive workloads which are at the heart of our modern life. Th...

In this paper we propose a methodology underlying a development of system-wide energy consumption models for servers, which is based on the analysis of performance counters. It enables to estimate the power usage of a machine under any load at runtime. By clustering applications we extract groups of programs having similar characteristics. This all...

In this paper we present a concept and specification of Data Center Efficiency Building Blocks (DEBBs), which represent hardware components of a data center complemented by descriptions of their energy efficiency. Proposed building blocks contain hardware and thermodynamic models that can be applied to simulate a data center and to evaluate its ene...

To evaluate data centers is tough. Several metrics are available to provide insight into their behaviour, but usually they are tested using simple benchmarks like LINPACK for HPC oriented data centers. A good choice of benchmarks is necessary to evaluate all the impact of applications on those data centers. One point that is often overlooked is the...

CoolEmAll project aims at improving energy-efficiency of data centers. The main results of CoolEmAll include data center Simulation, Visualization and Decision tools (SVD Toolkit) and models of Data Center Efficiency Building Blocks (DEBBs). The resulting tools of CoolEmAll will permit planners and operators of data centers to carry out flexible an...

Rising energy prices and the increasing environmental awareness of the general public are playing an ever-increasing role in the world of IT and computational science. The push for increased energy-efficiency is also present in the field of desktop computing and even home appliances. All major modern operating systems feature sophisticated power ma...

Due to growth of energy consumption by HPC servers and data centers many research efforts aim at addressing the problem of energy efficiency. Hence, the use of low power processors such as Intel Atom and ARM Cortex have recently gained more interest. In this arti- cle, we compare performance and energy efficiency of cutting-edge high- density HPC p...

Reducing energy consumption is a critical step in lowering data center operating costs for various institutions. As such, with the growing popularity of cloud computing, it is necessary to examine various methods by which energy consumption in cloud environments can be reduced. We analyze the effects of global virtual machine allocation on energy c...

The order completion and delivery problem is a common problem e.g. for small companies which resells products bought from producers. Such companies try to minimize both the cost of purchasing products and the cost of transportation. We present the formal mathematical model of the problem and the lower bound for the criterion value. We propose speci...

The fluency of production in a car factory depends on many factors. A very important one is an undisrupted flow of parts in the transportation system between different plants. Car parts always need to be delivered to specific locations at certain time period. This is a crucial point where the manufacturing process will not suffer from slowdowns. Howeve...

The significant role of traffc simulation is invaluable in the process of developing new traffc control strategies and improvement of roads infrastructure. The problem is vast, complicated and involves large amount of calculations, which makes the process hard to visualize in the real time. The representation of the real world and the way of how it...