B.-H. Lim and R. Bianchini. Limits on the performance benefits of multithreading and prefetching. In ACM Sigmetrics Conference on the Measurement and Modeling of Computer Systems, pages 37--46, May 1996.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....a page dominates or if the coherence unit is larger than a page. On the other hand, LRC outperforms EC if the page sized coherency unit results in prefetching due to the locality of future accesses. The choice between the two models should probably be guided by programmability considerations. In [26], new analytical models to measure the performance benefits of multithreading and prefetching have been presented with experimental measurements of parallel applications on the MIT Alewife multiprocessor. It was concluded in [12] that with the expected performance of future processors, the ....

B.H. Lim and R. Bianchini, "Limits on the performance benefits of multithreading and prefetching," in Proc. Int'l Conf. on the Measurement and Modeling of Computer Systems, May 1996.

....at the network interface or in protocol buffers for long periods of time before being noticed. We evaluate the use of two well known techniques in addressing this notification delay. The first technique is multi threading. Multi threading has been used in many systems to mask communication costs [17, 20, 28]. The difference here is that notification delay may be many times larger than the base communication costs, and therefore multi threading may be less effective. The second technique is to use a binary code re writer to insert poll commands into the application code. Again, this technique has been ....

....on the requester side, rather than trying to ensure that the latency does not incur in the first place. We tolerate latency by using multi threading to perform other work when one thread blocks on a remote request. The use of multi threading to hide remote communication has been studied before [17, 20, 28]. Our emphasis is different in that we are looking at longer delays relative to run lengths that we can use to hide the latencies. One advantage of multi threading is that its effectiveness is not necessarily affected by loop and program structure. However, such parallelism is not always ....

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B.-H. Lim and R. Bianchini, "Limits on the Performance Benefits of Multithreading and Prefetching," in Proceedings of the International Conference on the Measurement and Modeling of Computer Systems, 1996.

....requests. It seems that the multithreaded software was only evaluated on a uniprocessor; a multi processor platform would even ensure higher potential in the reduction of elapsed times. Combined multithreading and prefetching was also the subject of a study in the area of microprocessors [Lim and Bianchini, 1996]. The implementation on the MIT Alewife Machine showed that only a few of the applications can benefit significantly from multithreading (up to 10 improvement) while some but not all applications can benefit from prefetching (20 50 improvement) The main reason behind this is the relatively ....

Lim, B. and Bianchini, R. (1996). Limits on the Performance Benefits of Multithreading and Prefetching. In [SIGMETRICS, 1996], pages 37--46.

....if the coherence unit is larger than a page. LRC outperforms EC if the page sized coherency unit results in prefetching due to locality of future accesses. The choice between the two models should probably be guided by programmability considerations 2. 4 Remote Latency in Software DSMs Lim s paper[26] presents new analytical models of the performance benefits of multithreading and prefetching, and experimental measurements of parallel applications on the MIT Alewife multiprocessor. In Parson s paper[12] it was concluded that with the expected performance of future processors, the performance ....

B.-H. Lim and R. Bianchini, "Limits on the performance benefits of multithreading and prefetching," in Proceedings of the International Conference on the Measurement and Modeling of Computer Systems(SIGMETRICS), May 1996.

....of expression, implicit load balancing, and ease of code generation for parallelizing compilers [4] Three of the seven applications sped up by at least 17 , and the others by lesser amounts. However, our performance does not come close to the potential speedup implied by processor utilizations [5]. We have identified five contributors to this shortfall, and present strategies for dealing with them, if applicable: 1. Local contention for resources The threads on a single node often contend or block and wait for the same resource. Any instance of multiple local threads waiting on the same ....

Lim, B.-H. and R. Bianchini. "Limits on the Performance Benefits of Multithreading and Prefetching" in Proceedings of the International Conference on the Measurement and Modeling of Computer Systems. 1996.

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B.-H. Lim and R. Bianchini. Limits on the performance benefits of multithreading and prefetching. In ACM Sigmetrics Conference on the Measurement and Modeling of Computer Systems, pages 37--46, May 1996.

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Beng-Hong Lim and Ricardo Bianchini. Limits on the performance benefits of multithreading and prefetching. In Conference on Measurement and Modeling of Computer Systems Proceedings, 1996.

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