Patt, Y.N., `The I/O Subsystem -- A Candidate for Improvement,' IEEE Computer, 27(3), pp. 15--16, 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....stored on the hard disc. The effect of this cannot be neglected, and thus special algorithms are necessary for solving problems that are so large that their data do not fit into the main memory: external memory algorithms. There are only a few researchers who have intensively considered this field [1, 5, 4, 13]. Parallel Computation and the BSP Model. The situation in parallel computation is different: the lack of a unifying model is viewed as one of the main reasons why progress in this domain has been so much slower than in sequential computation. Here, numerous models exist, and a lot of energy is ....

Patt, Y.N., `The I/O Subsystem -- A Candidate for Improvement,' IEEE Computer, 27(3), pp. 15--16, 1994.

....(I O) system that links secondary storage to main memory and the CPU or CPUs is critical if good performance is to be achieved overall. Performance can be further improved if many disks can be efficiently used in parallel. Unfortunately, existing I O systems generally do not perform adequately [Pat]. In recent years, computer science theorists have studied the problem of efficiently using parallel disks to solve a variety of computational problems. At the same time, a number of parallel I O systems have become available, though in most cases they have failed to take adequate advantage of ....

Y. N. Patt, "The I/O Subsystem: A Candidate for Improvement," IEEE Computer 27 (March 1994), 15--16.

....Yarsun Hsu, Jean Pierre Prost IBM T. J. Watson Research Center P. O. Box 218 Yorktown Heights, NY 10598 1 Introduction Continued improvements in processor performance have exposed I O subsystems as a significant bottleneck, which prevents applications from achieving full system utilization [33, 54]. This problem is exacerbated in massively parallel processors (MPPs) where multiple processors are used together. As a result, I O subsystems have become the focus of much research, leading to the design of parallel I O hardware and matching system software. The requirement driving the work on ....

Y. N. Patt, "The I/O subsystem: a candidate for improvement". Computer 27(3), pp. 15--16, Mar 1994. (guest editor's introduction to special issue).

....hard disc. The effect of this cannot be neglected, and thus special algorithms are necessary for solving problems that are so large, that their data do not fit into the main memory: external memory algorithms. There is only a limited number of researchers who have intensively considered this field [1, 4, 3, 10]. Parallel Computation and the BSP Model. The situation in parallel computation is different: the lack of a unifying model may be viewed as one of the main reasons why progress in this domain has been so much slower than in sequential computation. Here numerous models are around, and a lot of ....

Patt, Y.N., `The I/O Subsystem -- A Candidate for Improvement,' IEEE Computer, 27(3), pp. 15--16, 1994.

....rate of 20 MBytes sec which, unfortunately, exceeds the storage rate of typical hard disks. Of course, the slow speed of hard disks is not a problem unique to a systems like SPItech. I O performance improvements have lagged behind the exponential increases in microprocessor speed for several years [2]. Hard disks have improved in some metrics, but they have remained stagnant in others. Advanced magnetic media and preci This research is supported in part by National Science Foundation CISE Instrumentation Program grant CDA 9222917. sion positioning ....

Y. N. Patt, "The I/O Subsystem----A Candidate for Improvement," IEEE Computer, vol. 27, pp. 15--16, March 1994.

....or CD ROMs) However, while main memory is a high speed electronic device, external memory is essentially a low speed mechanical device. Main memory access times have decreased from 30 to 80 percent a year, while external memory access times have not improved much at all over the past twenty years [38]. Nevertheless, we need external storage because we cannot build a main memory having an unbounded capacity and single cycle access time. Ongoing research is trying to improve the input output subsystem by introducing some hardware mechanisms such as disk arrays, disk caches, etc. 38] and is ....

....twenty years [38] Nevertheless, we need external storage because we cannot build a main memory having an unbounded capacity and single cycle access time. Ongoing research is trying to improve the input output subsystem by introducing some hardware mechanisms such as disk arrays, disk caches, etc. [38], and is investigating how to arrange data on disks by means of some efficient algorithms and data structures that minimize the number of external memory accesses [45] We therefore believe that the design and analysis of external memory text indexing data structures is very important from both a ....

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Patt, N. P. IEEE Computer: Special Issue "The I/O Subsystem: A candidate for improvement " (1994).

....the ones designed for main memory because of current technology. Specifically, over the past fifteen years, disk drive access time has improved very little while memory densities have increased at an average of 50 percent a year, and memory access times have decreased from 30 to 80 percent a year [27]. Nevertheless, we need external storage devices because we cannot build any main memory with an unbounded capacity and single cycle access time. For this reason, there is ongoing research to improve the I O subsystem by introducing several hardware mechanisms such as disk arrays, disk caches, ....

....Nevertheless, we need external storage devices because we cannot build any main memory with an unbounded capacity and single cycle access time. For this reason, there is ongoing research to improve the I O subsystem by introducing several hardware mechanisms such as disk arrays, disk caches, etc. [27]. On the other hand, since main memory is a high speed electronic device and external memory is a relatively low speed mechanical device, all the data must be suitably arranged on disks by using efficient (externalmemory) data structures that minimize the number of I Os [31] A great deal of ....

Patt, N. P. IEEE Computer: Special Issue "The I/O Subsystem: A candidate for improvement" (1994), vol. 27.

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Y. N. Patt, "The I/O subsystem -- a candidate for improvement", IEEE Computer 27(3), 15--16, 1994.

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