Download Analysis of Cache Performance for Operating Systems and by Agarwal PDF

By Agarwal

As we proceed to construct speedier and quick. er desktops, their functionality is be­ coming more and more depending on the reminiscence hierarchy. either the clock pace of the desktop and its throughput in keeping with clock count seriously at the reminiscence hierarchy. The time to complet. e a cache acce88 is oft. en the issue that det. er­ mines the cycle time. The effectiveness of the hierarchy in maintaining the typical fee of a reference down has an incredible influence on how shut the sustained according to­ formance is to the height functionality. Small adjustments within the functionality of the reminiscence hierarchy reason huge alterations in total process functionality. The powerful development of ruse machines, whose functionality is extra tightly coupled to the reminiscence hierarchy, has created expanding call for for prime functionality reminiscence structures. This pattern is probably going to speed up: the advancements in major reminiscence functionality could be small in comparison to the advancements in processor functionality. This distinction will result in an expanding hole among prOCe880r cycle time and major reminiscence acce. time. This hole needs to be closed by way of enhancing the reminiscence hierarchy. desktop architects have attacked this hole via designing machines with cache sizes an order of importance higher than these showing 5 years in the past. Microproce880r-based upward thrust structures now have caches that rival the scale of these in mainframes and supercomputers.

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Additional info for Analysis of Cache Performance for Operating Systems and Multiprogramming

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2 A Basic Cache Model This section describes a model for direct-mapped caches with a fixed block size. The total number of misses is calculated as the sum of the misses due to start-up, non-stationary, and intrinsic-interference effects. Only one process, i, is assumed to be active. In general, all parameters associated with this process will be subscripted with the letter i. However, for simplicity, we will bring in this subscript only when necessary to distinguish between processes. A notion of time in the context of a reference stream is necessary to study the transient behavior of caches.

Built-in tracing mechanisms. An example is the hardware provided T-bit facility in the VAX processor architecture [91]. Setting the T-bit causes a trap to be taken at the beginning of each instruction. These traps are intercepted by the operating system kernel which transfers control to a user-tracing process, whereupon the address of the instruction can be directly recorded. Data references can be determined by interpretively executing the instruction. • Software simulation of the architecture.

In another instance, ATUM has been used to find the operating-system code paths that resulted in long measured interrupt latency. An operating system algorithm performance bug was understood by capturing the exact sequence of table accesses used. In general, using the ATUM technique to performance-tune a user program is overkill, akin to using a microscope where a magnifying glass would do. However, it gives valuable insight in a few special cases of performance-tuning operating system code or hardware algorithms (cache, TLB, interrupts).

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