G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment - version 2.0 reference manual.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....take days to run, and researchers need access to expensive power monitoring equipment. In this scenario, simulation quite naturally seems like an attractive approach to follow. Simulation software has already been demonstrated to be able to model disk performance, both e#ciently and accurately [6, 19, 20]. In this paper, we present Dempsey (Disk Energy Modeling and Performance Simulation Environment) a tool that seeks to bring a similar level of accuracy and convenience to energy aware storage system designs. Dempsey extends the well tested DiskSim simulator [6] to model power consumption in ....

....e#ciently and accurately [6, 19, 20] In this paper, we present Dempsey (Disk Energy Modeling and Performance Simulation Environment) a tool that seeks to bring a similar level of accuracy and convenience to energy aware storage system designs. Dempsey extends the well tested DiskSim simulator [6] to model power consumption in addition to performance characteristics of hard disks. It includes a set of tools to extract the necessary power consumption parameters from a given disk. Dempsey uses stimulus based measurements to derive all the required performance and power consumption ....

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Ganger, G., Worthington, B., and Patt, Y. The DiskSim Simulation Environment Version 2.0 Reference Manual, December 1999. Available at: http://www.ece.cmu.edu/ ganger/disksim/.

....are written to the disk are saved in a file on the simulation host, which allows the disk model to maintain its data across simulation runs. The internal operation of the disk drive as well as the methods for computing seek and transfer times are based on the very detailed descriptions by Ganger [41] and Lee [57] The architecture of the modeled computer system does not represent any particular system. The processor uses the Sparc instruction set, but its microarchitecture resembles the MIPS R10000. This design choice was made in the original RSIM system which is the basis of the current ....

....issued with respect to the target block position. Figure 11 shows cleaned up versions of the seek time and bandwidth curves. The seek time curves match very well for the two systems, reflecting on the accuracy of the seek time approximation used in the simulator model, which is based on work by [41] and [57] The read bandwidth of the simulation model is constant and does not follow the downward slope of the real disk because the model does not implement zones with different sector counts per cylinder. Instead, it uses a simple constant sectors per cylinder geometry, which results in a ....

G.R. Ganger, B.L. Worthington, and Y.N. Patt, The DiskSim Simulation Environment Version 1.0 Reference Manual, tech. report CSE-TR-358-98, Dept. Electrical Eng. and Computer Science, Univ. of Michigan, Ann Arbor, Mich, 1998.

....amounts of tuples, benefit from the fast transfer property of MFS anyway. 4 Experimental Results We evaluated the performance of MFS for several real and synthetic data sets. To allow a fair and detailed comparison, we report the I O costs measured with the DiskSim 2. 0 simulation environment [10]. This tool is publicly available at http: www.ece.cmu.edu ganger disksim and was shown to model the real access times very accurately. In our experiments we used the settings for the most detailed and exact simulation. We compare MFS to the X tree which was shown to outperform other ....

G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim Simulation Environment Version 2.0 Reference Manual, 1999.

....design. Because probe based storage devices do not yet exist, analysis of system performance depends on simulation models. Disk models have been in use as long as disks, and more sophisticated models simulate detailed features such as controller effects, caching, data layout, and head movement [15, 5]. As probe based storage systems evolve, so does the interest in modeling them. Schlosser and Griffin et al. 16, 6] model the data seek and access dynamics for a probe based (MEMS) storage system using first order mechanics. They allow for non constant acceleration by discretizing the movement of ....

G. R. Ganger, B. L. Worthington, and Y. N. Patt. The disksim simulation environment version 1.0 reference manua l. Technical Report CSE-TR-358-98, University of Michigan, Ann Arbor, Feb. 1998.

....MEMS storage devices are still under development, current research in MEMS power conservation is rare. No specific strategies have been proposed for MEMS storage devices, especially for mobile computing applications. The research presented in this paper addresses that need. Using the DiskSim [4] MEMS simulator, we investigate the interaction between power consumption and I O performance based on file system traces [18] Our experimental results show that the power consumption pattern of MEMS is different from that of conventional disk drives. Based on this analysis, we propose three MEMS ....

....situation, tip 1 is useless and should be left inactive. Using the accessing subsectors strategy, only tips transferring data will be active, saving the power that would have been used by the other tips. 6 Experimental Results We simulated all three of our power management schemes using DiskSim [4] and the CMU MEMS based storage device model [6, 19] DiskSim is a well validated disk simulator that includes several commercial disk models as well as models for other devices such as MEMS based storage. As described in Section 4.2, we used two trace files in our experiments. The Seagate trace ....

G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment version 2.0 reference manual. Technical report, Carnegie Mellon University / University of Michigan, Dec. 1999.

....calculated average file system latency under the assumption that any requests satisfied by the file cache complete in zero time. This simplification is reasonable considering the disparity between memory and disk access times. The behavior of the disk was modeled using the DiskSim disk simulator [3] through Java Native Interfaces (JNI) We used parameters to simulate the Seagate ST41601N disk drive which has a total formatted capacity of 1.37 gigabytes of storage spread across 2098 cylinders and 17 data surfaces. The drive spins at a rate of 5400 RPM and has a reported seek time of 11.5 ....

G. R. Ganger, B. L. Worthington, and Y. N. Patt. The disksim simulation environment version 1.0 reference manual. Technical Report CSE-TR-358-98, University of Michigan, February 27 1998.

....and Figure 3 for how data is organized in MEMS devices) Performance of MEMS based storage. Using the basic physics equations governing a MEMS storage device s behavior [7] we built a performance model into the DiskSim storage simulator (a flexible storage system simulation infrastructure [6]) and evaluated its performance, given the device parameters in Table 1. The results (see Table 2) show that the system s average service time achieves better than an order of magnitude improvement over disk drives (0.52ms versus 10.1ms) with X seek time being the dominant factor. Figure 4 ....

Ganger, G. et. al. The DiskSim Simulation Environment Version 1.0 Reference Manual. Technical Report CSR-TR-358-98, The University of Michigan, Ann Arbor, Feb. 1998; see www.ece.cmu.edu/~ganger/ disksim/.

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J. S. Bucy and G. R. Ganger. The DiskSim simulation environment version 3.0 reference manual. Technical Report CMU-- CS--03--102. Department of Computer Science Carnegie-Mellon University, Pittsburgh, PA, January 2003.

....our implementation of the learning architecture described in Section 3. The planner implements heuristics as individual C objects, allowing it to add or subtract heuristics easily. To avoid the unsolved problem of workload characterization, the performance analyzer feeds I O traces into DiskSim [3] to model disk layout performance. The advantage of trace driven simulation over analytical models based on workload characterization is that simulation has been shown to be able to capture all aspects of a request stream. Reorganizer: The reorganizer reorganizes the current disk layout to match ....

J. S. Bucy and G. R. Ganger. The DiskSim simulation environment version 3.0 reference manual. Technical Report CMU--CS--03--102. Department of Computer Science Carnegie-Mellon University, Pittsburgh, PA, January 2003.

....mapping of blocks, defect management and also computes angular offsets of blocks. The mechanical model handles seek times, rotational latency and various other aspects of disk mechanics. The implementations of these modules in the current version of Diskmodel are derived from DiskSim 2. 0 [4]. Disksim 3.0 uses Diskmodel natively. Diskmodel has also been used in a device driver implementation of a shortest positioning time first disk request scheduler. B.2 Types and Units All math in diskmodel is performed using integer arithmetic. Angles identified as points on a circle divided ....

Gregory R. Ganger, Bruce L. Worthington, and Yale N. Part. The DiskSim simulation environment version 2.0 reference manual, December 1999.

....DiskSim Simulation Environment Version 2.0 Reference Manual Gregory R. Ganger, Bruce L. Worthington, and Yale N. Patt December 1999 Derived from Version 1. 0 Reference Manual [Ganger98]. Copyright (c) December 1999. All rights reserved. The DiskSim Simulation Environment Version 2.0 Reference Manual Gregory R. Ganger, Bruce L. Worthington, and Yale N. Patt fgreg.gangerg cmu.edu December 1999 Abstract DiskSim is an ecient, accurate and highly con gurable disk system ....

....in DiskSim is less general and more complicated than it should be. Also, DiskSim is not very helpful in debugging imperfect interconnection speci cations. Second, several aspects of DiskSim s software engineering are suboptimal. DiskSim 2.0 o ers several new features, relative to DiskSim 1. 0 [Ganger98]. Speci cally, several new disk drive characteristics (e.g. new layout and sparing schemes) are included in the disk model. Validated speci cations for more recent disk drives are bundled with the release. Also, the disk model has been more cleanly separated from the rest of DiskSim, allowing ....

G. Ganger, B. Worthington, Y. Patt, \The DiskSim Simulation Environment Version 1.0 Reference Manual", Technical Report CSE-TR-358-98, University of Michigan, Ann Arbor, February 1998.

....of its performance sensitivity to various design parameters and disk scheduling algorithms are presented in [8] We integrated our simulation module for MEMS based storage into DiskSim. DiskSim is a freely available disk simulator that has been proven to very accurately model disk drives [5], including the Seagate Cheetah used as a baseline in this paper. DiskSim also includes a synthetic I O workload generation module, which we used for the microbenchmark experiments in Section 3.2. 3.1 A Model of MEMS Based Storage Performance The set of bits that can be accessed by a given probe ....

G. Ganger, B. Worthington, and Y. Patt. The disksim simulation environment version 1.0 reference manual. Technical Report CSE-TR-358-98, The University of Michigan, Ann Arbor, February 1998.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment - version 2.0 reference manual.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment - version 2.0 reference manual.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The disksim simulation environment - version 2.0 reference manual.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The disksim simulation environment - version 2.0 reference manual.

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G. Ganger, B. Worthington, and Y. Patt. The DiskSim Simulation Environment Version 2.0 Reference Manual, December 1999.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment version 2.0 reference manual. Technical report, Carnegie Mellon University / University of Michigan, Dec. 1999.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment - version 2.0 reference manual.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment - version 2.0 reference manual.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment version 2.0 reference manual. Reference Manual, December 1999.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment version 2.0 reference manual. Technical report, Carnegie Mellon University / University of Michigan, Dec. 1999.

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G. R. Ganger, B. L. Worthington, and Y. N. Patt. The DiskSim simulation environment version 2.0 reference manual. Technical report, Carnegie Mellon University / University of Michigan, Dec. 1999.

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Gregory R. Ganger, Bruce L. Worthinghton, and Yale N. Patt. The DiskSim Simulation Environment Version 1.0 Reference Manual, CSE-TR-358-98, The University of Michigan.

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