Distinctly different land ownership and fencing patterns arose in the eastern and western United States. Original fence laws on the east coast were based on the British system, and rapidly increasing population quickly resulted in laws requiring livestock to be fenced in. In the west, land ownership patterns and policies reflected a strong influence of law and tradition, plus the vast land area involved made extensive fencing impractical until mandated by a growing population and conflicts between landowners. The "open range" tradition of requiring landowners to fence out unwanted livestock was dominant in most of the rural west until very late in the 20th century, and even today, a few isolated regions of the west still have open range statutes on the books. More recently, fences are generally constructed on the surveyed property line as precisely as possible. Today, across the nation, each state is free to develop its own laws regarding fences. In many cases for both rural and urban property owners, the laws were designed to require adjacent landowners to share the responsibility for maintaining a common boundary fenceline. Today, however, only 22 states have retained that provision.
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Although fences are designed for low-overhead concurrency coordination, they can be expensive in current machines. If fences were largely free, faster fine-grained concurrent algorithms could be devised, and compilers could guarantee Sequential Consistency (SC) at little cost. In this paper, we present WeeFence (or WFence for short), a fence that is very cheap because it allows post-fence accesses to skip it. Such accesses can typically complete and retire before the pre-fence writes have drained from the write buffer. Only when an incorrect reordering of accesses is about to happen, does the hardware stall to prevent it. In the paper, we present the WFence design for TSO, and compare it to a conventional fence with speculation for 8-processor multicore simulations. We run parallel kernels that contain explicit fences and parallel applications that do not. For the kernels, WFence eliminates nearly all of the fence stall, reducing the kernels' execution time by an average of 11%. For the applications, a conservative compiler algorithm places fences in the code to guarantee SC. In this case, on average, WFences reduce the resulting fence overhead from 38% of the applications' execution time to 2% (in a centralized WFence design), or from 36% to 5% (in a distributed WFence design).
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Jun 26, 2014 - Download the latest version of Fences free
Fences is a program that helps you organize your desktop, and can hide your icons when they're not in use. It's FREE for personal use, so try it out today, and change how you use your desktop forever! Nimi Places is in numerous respects like Fences. The free program handles things somewhat extraordinary keeping in mind it takes more time to sort out everything legitimately; it is putting forth similar result at last. When you first begin the program you can pick a layout that it ships with or select to begin without extraordinary organizers that the program will populate naturally. In the event that you select a…