VTechWorks staff will be away for the Thanksgiving holiday beginning at noon on Wednesday, November 27, through Friday, November 29. We will resume normal operations on Monday, December 2. Thank you for your patience.

Browsing by Author "Bhat, U. Narayan"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Dynamic Quantum Allocation and Swap-Time Variability in Time-Sharing Operating Systems
    Bhat, U. Narayan; Nance, Richard E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1973)
    No abstract available.
  • Thumbnail Image
    An Evaluation Of Cpu Efficiency Under Dynamic Quantum Allocation
    Bhat, U. Narayan (Department of Computer Science, Virginia Polytechnic Institute & State University, 1975)
    A model for a time-sharing operating system is developed in order to assess the effects of dynamic quantum allocation and overhead variability on central processing unit (CPU) efficiency. CPU efficiency is determined by the proportion of time devoted to user-oriented (problem state) tasks within a busy period. Computational results indicate that a dynamic quantum allocation strategy produces significant differences in CPU efficiency compared to a constant quantum. The differences are affected significantly by the variability among allocated quantum values and the demand on the system. Overhead variability also has a pronounced effect. A function that depicts overhead as decreasing with demand produces more stable values of CPU efficiency. The interaction between demand and the amount of overhead is observed to be significant.
  • Thumbnail Image
    A Queueing Network Analysis of Dynamic Recon-figurability in a Hierarchical Information Network
    Nance, Richard E.; Bhat, U. Narayan (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992)
    Using a queueing network model of a hierarchical information network, we compare the effect of limited dynamic reconfiguration on expected transmission delays. Two distinctive features characterize the queueing network model. First, the assignment of a set of weights to the nodes dependent on the hierarchical level reflects the increasing importance of information as it is transferred to higher levels. Second, the dynamic hierarchy requires a communications protocol that partitions the analysis of network delay into three periods: regular operation, reconfiguration, and adjustment. Characterization of the performance of the dynamic hierarchy entails the description of message transmission delay as a composite of the three periods.