Interaction of software prefetching with ILP processors in shared-memory systems

Parthasarathy Ranganathan, Vijay S. Pai, Hazim Abdel-Shafi, Sarita V. Adve

Research output: Contribution to journalConference articlepeer-review

Abstract

Current microprocessors aggressively exploit instruction-level parallelism (ILP) through techniques such as multiple issue, dynamic scheduling, and non-blocking reads. Recent work has shown that memory latency remains a significant performance bottleneck for shared-memory multiprocessor systems built of such processors. This paper provides the first study of the effectiveness of software-controlled non-binding prefetching in shared-memory multiprocessors built of state-of-the-art ILP-based processors. We find that software prefetching results in significant reductions in execution time (12% to 31%) for three out of five applications on an ILP system. However, compared to previous-generation systems, software prefetching is significantly less effective in reducing the memory stall component of execution time on an ILP system. Consequently, even after adding software prefetching, memory stall time accounts for over 30% of the total execution time in four out of five applications on our ILP system. This paper also investigates the interaction of software prefetching with memory consistency models on ILP-based multiprocessors. In particular, we seek to determine whether software prefetching can equalize the performance of sequential consistency (SC) and release consistency (RC). We find that even with software prefetching, for three out of five applications, RC provides a significant reduction in execution time (15% to 40%) compared to SC.

Original languageEnglish (US)
Pages (from-to)144-156
Number of pages13
JournalConference Proceedings - Annual International Symposium on Computer Architecture, ISCA
DOIs
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1997 24th Annual International Symposium on Computer Architecture - Denver, CO, USA
Duration: Jun 2 1997Jun 4 1997

ASJC Scopus subject areas

  • Hardware and Architecture

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