Linux Format: Issue 156 (April 2012) - Raspberry Pi

We`re wildly fascinated with the Raspberry Pi, and also you may be too. It`s an entire, operating notebook, it runs Linux and it expenditures simply $25. It`s no longer home windows 8-certified, yet it`s going to alter the way in which the realm thinks approximately computing.We move behind the curtain to deliver you the interior tale of this progressive little bit of kit.

Elsewhere within the journal we accelerate your Linux field to inside an inch of its existence, choose the simplest distro to your creaking previous laptop that`s at the moment accumulating dirt within the attic (or suffering to deal with the newest bloatware from Microsoft), and seek advice from Michael Meeks in regards to the ethical forces at paintings for those who decide on your distro.

Gasp in surprise as Gentoo 12 is printed because the most sensible distro ever, and suppose a hot glow after we attempt KDE 4.8 and observe that it doesn`t suck (on the opposite, it`s amazing – we simply needed to positioned a few flame-bait in the following to irritate our KDE-using editor). All this and extra, coming to a glittery PDF analyzing gadget close to you!

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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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