NDLI: Efficient synchronization:let them eat QOLB

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Volume 25, Issue 5, Dec. 1997

Volume 25, Issue 4, Sept. 1997

Volume 25, Issue 3, June 1997

Volume 25, Issue 2, May 1997

Improving superscalar instruction dispatch and issue by exploiting dynamic code sequences

Exploiting instruction level parallelism in processors by caching scheduled groups

On deadlocks in interconnection networks

Implementing multidestination worms in switch-based parallel systems

Tolerating multiple failures in RAID architectures with optimal storage and uniform declustering

Hardware fault containment in scalable shared-memory multiprocessors

Effects of communication latency, overhead, and bandwidth in a cluster architecture

The Mercury Interconnect Architecture

The design and analysis of a cache architecture for texture mapping

Designing high bandwidth on-chip caches

Memory-system design considerations for dynamically-scheduled processors

The interaction of software prefetching with ILP processors in shared-memory systems

VM-based shared memory on low-latency, remote-memory-access networks

Efficient synchronization

Dynamic speculation and synchronization of data dependences

Dynamic instruction reuse

Complexity-effective superscalar processors

Coherence controller architectures for SMP-based CC-NUMA multiprocessors

Prefetching using Markov predictors

Data prefetching on the HP PA-8000

Target prediction for indirect jumps

The agree predictor

Trading conflict and capacity aliasing in conditional branch predictors

A language for describing predictors and its application to automatic synthesis

Run-time adaptive cache hierarchy management via reference analysis

The energy efficiency of IRAM architectures

DataScalar architectures

Volume 25, Issue 1, March 1997

Efficient synchronization:let them eat QOLB

Content Provider	ACM Digital Library
Author	Kägi, Alain Goodman, James R. Burger, Doug
Abstract	Efficient synchronization primitives are essential for achieving high performance in fine-grain, shared-memory parallel programs. One function of synchronization primitives is to enable exclusive access to shared data and critical sections of code. This paper makes three contributions. (1) We enumerate the five sources of overhead that locking synchronization primitives can incur. (2) We describe four mechanisms (local spinning, queue-based locking, collocation, and synchronized prefetch) that reduce these synchronization overheads. (3) With detailed simulations, we show the extent to which these four mechanisms can improve the performance of shared-memory programs. We evaluate the space of these mechanisms using seventeen synchronization constructs, which are formed from six base typed of locks (TEST&SET, TEST&TEST&SET, MCS, LH, M, and QOLB). We show that large performance gains (speedups of more than 1.5 for three of five benchmarks) can be achieved if at least three optimizing mechanisms are used simultaneously. We find that QOLB, which incorporates all four mechanisms, outperforms all other primitives (including reactive synchronization) in all cases. Finally, we demonstrate the superior performance of a low-cost implementation of QOLB, which runs on an unmodified cluster of commodity workstations.
Starting Page	170
Ending Page	180
Page Count	11
File Format	PDF
ISSN	01635964
DOI	10.1145/384286.264166
Journal	ACM SIGARCH Computer Architecture News (CARN)
Volume Number	25
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1981-04-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article

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