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Sede Regional Brunca

URI permanente para esta comunidadhttp://10.0.96.45:4000/handle/11056/14884

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    Ítem
    Analyzing a Five-year Failure Record of a Leadership-class Supercomputer
    (Institute of Electrical and Electronics Engineers, Incorporated (IEEE), 2019-10-18) Rojas, Elvis; Meneses, Esteban; Jones, Terry; Maxwell, Don
    Extreme-scale computing systems are required to solve some of the grand challenges in science and technology. From astrophysics to molecular biology, supercomputers are an essential tool to accelerate scientific discovery. However, large computing systems are prone to failures due to their complexity. It is crucial to develop an understanding of how these systems fail to design reliable supercomputing platforms for the future. This paper examines a five-year failure and workload record of a leadership-class supercomputer. To the best of our knowledge, five years represents the vast majority of the lifespan of a supercomputer. This is the first time such analysis is performed on a top 10 modern supercomputer. We performed a failure categorization and found out that: i) most errors are GPUrelated, with roughly 37% of them being double-bit errors on the cards; ii) failures are not evenly spread across the physical machine, with room temperature presumably playing a major role; and iii) software errors of the system bring down several nodes concurrently. Our failure rate analysis unveils that: i) the system consistently degrades, being at least twice as reliable at the beginning, compared to the end of the period; ii) Weibull distribution closely fits the mean-time-between-failure data; and iii) hardware and software errors show a markedly different pattern. Finally, we correlated failure and workload records to reveal that: i) failure and workload records are weakly correlated, except for certain types of failures when segmented by the hours of the day; ii) several categories of failures make jobs crash within the first minutes of execution; and iii) a significant fraction of failed jobs exhaust the requested time with a disregard of when the failure occurred during execution.
  • Miniatura
    Ítem
    Ansiedad matemática y su relación con algunas variables en futuros maestros de primaria de la Zona Sur de Costa Rica
    (Universidad Nacional, Costa Rica, 2019) Hernández Vargas, Fabián J.; ESpinoza González, Johan
    Se presenta un estudio sobre la ansiedad matemática de 238 estudiantes para maestros de educación primaria de la zona sur de Costa Rica y su relación con las variables sexo, universidad en la que estudia, modalidad en la que se graduó de secundaria, lugar de procedencia, rendimiento académico, año que cursa de la carrera y edad. Los resultados concluyen que los estudiantes poseen un nivel medio de ansiedad hacia la Matemática. Además, resultó que las mujeres, los estudiantes que tienen menor rendimiento académico y que provienen de la Universidad Internacional San Isidro Labrador, sede Pérez Zeledón son los que presentan mayor ansiedad.