System Performance Tuning by Gian-Paolo D. Musumeci

By Gian-Paolo D. Musumeci

Approach functionality Tuning" covers certain components: functionality tuning, or the paintings of accelerating functionality for a particular software, and potential making plans, or finding out what most sensible fulfills a given position. This booklet specializes in the working procedure, the underlying undefined, and their interactions.

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2. Read the entire cache line of the source. 3. Write the first piece to the target, incurring a cache miss. 4. Write the entire cache line to the target. 5. Repeat until finished. At some later stage, the target cache line will be flushed for more useful data. If the target and source are separated by an exact multiple of the cache size, and the system uses a direct-mapped cache, both the source and destination will use the same cache line, which will cause a read and write miss for each entry in the line.

3 in Chapter 8. 2 Linked lists Let's think about a linked list with a few thousand entries. Each entry consists of some data and a link to the next element. We search our list by traversal: because the code for searching the list can be made very compact, it fits well in the instruction cache. However, every data request will be in a different cache line, and so every data access incurs a cache miss. If the size of the linked list exceeds our cache size and we are forced to start flushing cache lines to make room for the next element in the list, our next search attempt will not find the start of the list in the cache!

While it's true that most systems administration tasks don't require any significant knowledge of electrical or computer engineering, performance tuning is at heart about understanding how things work -- it's very difficult to improve something if you don't have any idea how it works. For processor performance, this foundation is microprocessor design. In this chapter, I move from discussing basic microprocessor architecture to a host of supporting areas: caches, which play a vital role in the performance of modern processors; process scheduling, or how the operating system decides what processes should have priority in using the CPU; multiprocessing; the interconnects used to connect processors to other processors and to peripheral devices; and, finally, I discuss some tools that can be used to monitor microprocessor performance.

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