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    Highly concurrent latency-tolerant register files for GPUs

    , Article ACM Transactions on Computer Systems ; Volume 37, Issue 1-4 , 2021 ; 07342071 (ISSN) Sadrosadati, M ; Mirhosseini, A ; Hajiabadi, A ; Ehsani, S. B ; Falahati, H ; Sarbazi Azad, H ; Drumond, M ; Falsafi, B ; Ausavarungnirun, R ; Mutlu, O ; Sharif University of Technology
    Association for Computing Machinery  2021
    Graphics Processing Units (GPUs) employ large register files to accommodate all active threads and accelerate context switching. Unfortunately, register files are a scalability bottleneck for future GPUs due to long access latency, high power consumption, and large silicon area provisioning. Prior work proposes hierarchical register file to reduce the register file power consumption by caching registers in a smaller register file cache. Unfortunately, this approach does not improve register access latency due to the low hit rate in the register file cache. In this article, we propose the Latency-Tolerant Register File (LTRF) architecture to achieve low latency in a two-level hierarchical... 

    Aging-Aware context switching in multicore processors based on workload classification

    , Article IEEE Computer Architecture Letters ; Volume 19, Issue 2 , 2020 , Pages 159-162 Sharifi, F ; Rohbani, N ; Hessabi, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    As transistor dimensions continue to shrink, long-term reliability threats, such as Negative Bias Temperature Instability, affect multicore processors lifespan. This letter proposes a load balancing technique, based on the rate of integer and floating-point instructions per workloads. This technique classifies workloads into integer-majority and floating-point-majority classes and migrates workloads among cores in order to relax the stressed execution units. The context switching feature of operating system is employed to reduce implementation and performance overheads of the proposed technique. According to the simulations, the proposed technique reduces the aging rate of a multicore...