Provisioning Spot Market Cloud Resources to Create Cost-effective Virtual Clusters

Infrastructure-as-a-Service providers are offering their unused resources in the form of variable-priced virtual machines (VMs), known as "spot instances", at prices significantly lower than their standard fixed-priced resources. To lease spot instances, users specify a maximum price they are willing to pay per hour and VMs will run only when the current price is lower than the user's bid. This paper proposes a resource allocation policy that addresses the problem of running deadline-constrained compute-intensive jobs on a pool of composed solely of spot instances, while exploiting variations in price and performance to run applications in a fast and economical way. Our policy relies on job runtime estimations to decide what are the best types of VMs to run each job and when jobs should run. Several estimation methods are evaluated and compared, using trace-based simulations, which take real price variation traces obtained from Amazon Web Services as input, as well as an application trace from the Parallel Workload Archive. Results demonstrate the effectiveness of running computational jobs on spot instances, at a fraction (up to 60% lower) of the price that would normally cost on fixed priced resources.Comment: 14 pages, 4 figures, 11th International Conference on Algorithms and Architectures for Parallel Processing (ICA3PP-11); Lecture Notes in Computer Science, Vol. 7016, 201

Ocorrência de oósporos de Plasmopora viticola, agente causal do míldio da videira na região da Serra Gaúcha.

bitstream/item/60789/1/CNPUV-PESQ.AND.-17.pd

Holistic Slowdown Driven Scheduling and Resource Management for Malleable Jobs

In job scheduling, the concept of malleability has been explored since many years ago. Research shows that malleability improves system performance, but its utilization in HPC never became widespread. The causes are the difficulty in developing malleable applications, and the lack of support and integration of the different layers of the HPC software stack. However, in the last years, malleability in job scheduling is becoming more critical because of the increasing complexity of hardware and workloads. In this context, using nodes in an exclusive mode is not always the most efficient solution as in traditional HPC jobs, where applications were highly tuned for static allocations, but offering zero flexibility to dynamic executions. This paper proposes a new holistic, dynamic job scheduling policy, Slowdown Driven (SD-Policy), which exploits the malleability of applications as the key technology to reduce the average slowdown and response time of jobs. SD-Policy is based on backfill and node sharing. It applies malleability to running jobs to make room for jobs that will run with a reduced set of resources, only when the estimated slowdown improves over the static approach. We implemented SD-Policy in SLURM and evaluated it in a real production environment, and with a simulator using workloads of up to 198K jobs. Results show better resource utilization with the reduction of makespan, response time, slowdown, and energy consumption, up to respectively 7%, 50%, 70%, and 6%, for the evaluated workloads

Polyhydroxyalkanoate (PHA) production from sludge and municipal wastewater treatment

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Qualidade da carne de cordeiros: genótipo e manejo nutricional.

Made available in DSpace on 2017-08-25T19:10:02Z (GMT). No. of bitstreams: 1 Qualidade.pdf: 414477 bytes, checksum: 8b4219f4b55df5a06623a29e39eaac8e (MD5) Previous issue date: 2017-08-2

Características morfométricas e da carcaça de tambaqui abatidos com diferentes pesos.

Peixe de destaque na piscicultura nacional, o tambaqui é a espécie nativa mais cultivada no Brasil em virtude da sua facilidade de produção e boa aceitação no mercado. Neste contexto, a pesquisa teve como objetivo avaliar as características morfométricas e da carcaça de tambaqui abatidos com diferentes pesos. Foram utilizados vinte e quatro tambaquis, em que os tratamentos (T) foram em função do peso vivo dos animais constituídos por T1: tambaquis entre 1 e 1,5 kg, T2: entre 2 e 2,5 kg e T3: entre 3 e 3,5 kg, distribuídos em um delineamento inteiramente casualizado. Todas as medidas morfométricas aumentaram (P<0,01) à medida que se elevou o peso ao abate dos animais. As razões morfométricas comprimento da cabeça/comprimento padrão (CC/CP), largura do tronco/comprimento do tronco (LT/CT), altura do tronco/comprimento do tronco (AT/CT) e altura do tronco/comprimento padrão (AT/CP) reduziram (P<0,01) com o aumento do peso. O peso de carcaça com e sem cabeça e de tronco limpo, assim como os dos componentes não-carcaça também aumentou (P<0,01), com exceção do rendimento do peixe eviscerado que foi maior (P<0,01) e do rendimento das vísceras que foi menor (P<0,05) nos animais abatidos entre 2,0 e 2,5 kg. Tambaquis abatidos com peso vivo entre 2,0 e 2,5 kg apresentam maior rendimento de carcaça e menor rendimento de vísceras

Feeding behavior of lambs fed diets containing old man saltbush hay.

This study evaluated the behavior and performance of lambs fed diets containing increasing levels of old man saltbush hay plus concentrate

Control of sulphide during anaerobic treatment of S-containing wastewaters by adding limited amounts of oxygen or nitrate

Sulphide generated during anaerobic treatment of S-containing wastewaters represents an environmental problem. Adding limited amounts of oxygen or nitrate (or nitrite) to biologically (or chemically) oxidise sulphide forms a simple process level strategy to control this problem. This short review evaluates the feasibility and limitations of this strategy on the basis of the results of bioreactor studies.Sulphide generated during anaerobic treatment of S-containing wastewaters represents an environmental problem. Adding limited amounts of oxygen or nitrate (or nitrite) to biologically (or chemically) oxidise sulphide forms a simple process level strategy to control this problem. This short review evaluates the feasibility and limitations of this strategy on the basis of the results of bioreactor studies.Spanish Ministry of Education and Science; AEA Technology Environment; Nova Energie; The Swedish Gas Centre; University of Southern Denmark