Logo do repositório
  • Página Inicial(current)
  • Buscar
    Por Data de PublicaçãoPor AutorPor TítuloPor Assunto
  • Tutoriais
  • Documentos
  • Sobre o RI
  • Eventos
    Repositório Institucional da UFRN: 15 anos de conexão com o conhecimento
  • Padrão
  • Amarelo
  • Azul
  • Verde
  • English
  • Português do Brasil
Entrar

SIGAA

  1. Início
  2. Pesquisar por Autor

Navegando por Autor "Barros, Tiago"

Filtrar resultados informando as primeiras letras
Agora exibindo 1 - 2 de 2
  • Resultados por página
  • Opções de Ordenação
  • Carregando...
    Imagem de Miniatura
    Artigo
    Distributed-Memory load balancing with cyclic token-based work-stealing applied to reverse time migration
    (Institute of Electrical and Electronics Engineers, 2019) Martins, Idalmis Milian Sardina; Assis, Ítalo Augusto Souza; Oliveira, Antônio D. S.; Barros, Tiago; Bianchini, Calebe P.; Souza, Samuel Xavier de
    Reverse time migration (RTM) is a prominent technique in seismic imaging. Its resulting subsurface images are used in the industry to investigate with higher confidence the existence and the conditions of oil and gas reservoirs. Because of its high computational cost, RTM must make use of parallel computers. Balancing the workload distribution of an RTM is a growing challenge in distributed computing systems. The competition for shared resources and the differently-sized tasks of the RTM are some of the possible sources of load imbalance. Although many load balancing techniques exist, scaling up for large problems and large systems remains a challenge because synchronization overhead also scales. This paper proposes a cyclic token-based work-stealing (CTWS) algorithm for distributed memory systems applied to RTM. The novel cyclic token approach reduces the number of failed steals, avoids communication overhead, and simplifies the victim selection and the termination strategy. The proposed method is implemented as a C library using the one-sided communication feature of the message passing interface (MPI) standard. Results obtained by applying the proposed technique to balance the workload of a 3D RTM system present a factor of 14.1 % speedup and reductions of the load imbalance of 78.4 % when compared to the conventional static distribution
  • Nenhuma Miniatura disponível
    TCC
    Pascal Viewer - Graphic Representation of the efficiency Variation of a parallel application analyzed by time markers
    (Universidade Federal do Rio Grande do Norte, 2018-12-20) Cunha, Daniel Augusto Moura Cunha; Souza, Samuel Xavier de; Anderson Braulio Nobrega da Silva; Barros, Tiago; Silva, Anderson Braulio Nobrega da
    This work objective is to develop an automated graphing system that receives a formatted JSON output. Through the data collected from the executions of a parallel program with different problem sizes and cores of different processors and calculations realized by the system it is possible to analyze the performance of the program in a faster and clear form. It is intended that users can more quickly analyze the performance of their programs without worrying about manually processing the information. PaScal Viewer, is the beggining of a long trajectory to delivery relevant information to researchers perform as efficient a research as their programs and there is still much to be explored and implemented. This work, guided by Professor Samuel Xavier and co-led by Master Anderson Braulio, has already yielded a publication in The International Conference for High Performance Computing, Networking, Storage, and Analysis, or simply SC, in 2018. And at this conference presentations, tutorials, panels, and discussion forums have included breakthroughs in many areas and inspired new and innovative areas of computing through the years.
Repositório Institucional - UFRN Campus Universitário Lagoa NovaCEP 59078-970 Caixa postal 1524 Natal/RN - BrasilUniversidade Federal do Rio Grande do Norte© Copyright 2025. Todos os direitos reservados.
Contato+55 (84) 3342-2260 - R232Setor de Repositórios Digitaisrepositorio@bczm.ufrn.br
DSpaceIBICT
OasisBR
LAReferencia
Customizado pela CAT - BCZM