M. R. Ebling and M. Satyanarayanan. SynRGen: an extensible file reference generator. In Proceedings of SIGMETRICS, pages 108--117. ACM, 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....the abruptly terminated curve for the 10Gbps simulation) due to a limit in the environment used to run the simulation. As seen from the graph above it takes approximately 250 seconds of simulation time before the system reaches steady state and traces can be analyzed. 7. Related work SynRGen[7] is a file reference generator that is used to build test suites for file systems. Like the structural model method it attempts to model the behavior of real users by tracing user behavior. A model of user behavior is built from the trace. Stress testing of the file system is performed by using ....

Ebling, M. R. and Satyanarayana, M., "SynRGen: An extensible file reference generator," ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Systems, pp. 108--117. (May 1994).

....of the abilities such a benchmark should posses, and additionally detail two methods of achieving this end, although at this stage such a benchmark does not exist. On a related issue, to address problems of benchmarks not being accurate simulations of the user workload, Ebling and Satyanarayanan [32] implemented a system that produces what they refer to as micro models. A micro model is a characterisation of a particular program. For example, the micro model of a C compiler would be the reading of a .c file, the reading of several .h files and the writing of a .o file. Ebling and ....

....Baker [9] for a proof of concept study involving changes to hardware support for caches. Blaze and Alonso [16, 15, 14] and Blaze [13, 11] all make use of common sets of data gained with the rpcspy tool [12] While details are not given on exactly what traces are used, Ebling and Satyanarayanan [32] used traces to develop their micro models for incorporation into highaccuracy load generators. In the tradition of citation, many papers also use information from previous papers to assist in the justification (or refutation) of ideas. As a result, research into operating systems can quickly ....

Ebling, M. R., and Satyanarayanan, M. Synrgen: An extensible file reference generator. Tech. Rep. CMU-CS-94-119, School of Computer Science, Carnegie Mellon University, February 1994.

....directory tree is mostly resident in the main memory file block cache when the task begins, since the experiment removes the new copy resulting from an immediately prior copytree execution. SynRGen Workloads SynRGen is a synthetic file reference generator that operates at the system call level [Ebling94]. For trace collection, SynRGen was configured to imitate programmers performing edit debug activity on large software systems. Ebling94] showed that this configuration closely matches measurements of such user activity. Each programmer is emulated by a single process that executes tasks ....

....from an immediately prior copytree execution. SynRGen Workloads SynRGen is a synthetic file reference generator that operates at the system call level [Ebling94] For trace collection, SynRGen was configured to imitate programmers performing edit debug activity on large software systems. [Ebling94] showed that this configuration closely matches measurements of such user activity. Each programmer is emulated by a single process that executes tasks interspersed with user think times. Each task consists of a series of file accesses and possibly some computation time (e.g. to emulate ....

M. Ebling, M. Satyanarayanan, "SynRGen: An Extensible File Reference Generator ", ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Systems, May 1994, pp. 108--117.

....of the storage system. 32 There has been recent work on characterizing the workload of scientific applications in terms of file system usage on parallel machines [Nieuwejaar95] Unfortunately, the results have not included a general workload model. One model that considers the I O is SynRGen [Ebling94] which uses parameterized micromodels to model user actions against a file system. Since SynRGen was developed to stress test a file system, the number of files, symbolic and hard links, and the directory hierarchy are important; these things are not important to us. The idea of specifying ....

Maria R. Ebling and M. Satyanarayanan. SynRGen: an extensible file reference generator. Proceedings of ACM SIGMETRICS Conference on Measurement and Modeling of Computer Systems 1994 (Nashville, TN). Published as Performance Evaluation Review, 22(1):108--17, 16--20 May 1994.

....users. Modeling this is not difficult conceptually, however we omit further discussion as more needs to be done to understand such group behaviors. 5 Related Work There has been much work in extracting characteristics from raw traces to generate synthetic workloads, for example, in file systems [3, 4]. Synthetic workloads are concise in space requirements and are easily modified by changing parameters. Such an approach may also be feasible for highly interactive applications such as synchronous groupware. We view this as a choice between a synthetic trace and a real trace. Our emphasis is on ....

M. Ebling and M. Satyanarayanan. Synrgen: An extensible file reference generator. In Proceedings of the ACM SIGMETRICS Conference on Measurement and Modeling of Computer Systems, May 1994. 19

....Unix file systems [29] The experiments are summarized in Table 5.2. The above experiments are modeled after similar experiments used to evaluate the performance of the Sprite log structured file system [44] and the Logical Disk [8] The file sizes of 1 KByte and 10 KByte are also consistent with [1, 9, 23, 37] which show that roughly between 70 and 80 of all files in the measured Unix, Sprite and AFS file systems are less than 10 KByte in size. 5.2.2 File Organizations The following file organizations and interfaces are used in the small and large file I O experiments. The labels in front of each ....

Maria R. Ebling and M. Satyanarayanan. SynRGen: An extensible file reference generator. In Proceedings of the 1994 ACM SIGMETRICS Conference on Measurement and Modeling of Computer Systems, Nashville, Tennessee, May 1994. Also available as Technical Report CMU-CS-94-119.

....processes that result in stable distributed applications collectively define stability engineering. Existing programming tools and methodologies do not provide effective design rules and decision aids for stability engineering. Previously, designers of database systems [6] and file systems [7] have used techniques that resemble our approach for stability engineering. These techniques are, however, application specific. Moreover, users of distributed applications have little guidance to appropriately configure their application s use. We believe that a uniform approach is needed to ....

....stage to: 1) reconfigure the application as needed, and (2) validate the model with field data, instead of the simulated data used in the architectural design stage. IV. RELATED WORK A model based approach has been applied for engineering of several distributed systems, e.g. file systems [7,17], and databases [6] This approach, however, is not readily available to application programmers with tight deadlines and schedules. We want to build tools and libraries to make such engineering viable for application developers through stability engineering. PROTOB is an object oriented CASE tool ....

Maria R. Ebling and M. Satyanarayanan. SynRGen: An 8 Extensible File Reference Generator. In Proceedings of ACM SIGMETRICS Conference on Measurement and Modeling of Computer Systems, volume 22 of Performance Evaluation Review, pages 108--117, Nashville, Tenessee, May 1994.

....Rather than attempting to recreate the disk activity resulting from particular system activity, one could use the system activity itself to drive models (or instances) of the system. Two promising approaches to synthetic system benchmarks are the SPEC S det benchmark [Gaede81, Gaede82] and SynRGen [Ebling94], a synthetic file reference generator. Acknowledgements I thank Richard Golding, Yale Patt, John Wilkes and Bruce Worthington for their direct involvement in the development of this work. This work was partially funded by a CMG graduate fellowship. Our storage subsystem research activity at the ....

M. Ebling, M. Satyanarayanan, "SynRGen: An Extensible File Reference Generator", ACM SIGMETRICS Conference, May 1994, pp. 108--117.

....events. Public traces such as the Sprite traces [BHK 91] and others [Bla92, KPR94, DMW 94] do not record all file system activity or include the timing information we needed. 5 Recently, some new file tracing tools have become available that did not exist when we began our work[MS94, ES94] 4.1.2 Information Gathered Because the trace information we needed was not publicly available, we gathered our own traces. We augmented a SunOS 4.1 kernel to trace all read, write, open, create, close, unlink, mmap, exec and seek system calls. To keep track of process specific information, ....

Maria R. Ebling and M. Satyanarayanan. SynRGen: An Extensible File Reference Generator. In Proceedings of the 1994 ACM SIGMETRICS Conference on Measurement and Modeling of Computer Systems, May 1994.

....3.4 (5.7) Symbolic Links Directory 4.1 (10.1) 3.4 (7.5) 13.6 (45.3) 6.0 (25.9) 6.3 (24.9) This table summarizes various characteristics of system, user, project, and bulletin board volumes in AFS at Carnegie Mellon University in early 1990. The data was obtained via static analysis by Ebling [2]. The numbers in parentheses are standard deviations. Fig. 11. File and directory characteristics of AFS. The table and graph in this figure show the distribution of replica subtree height over mutation operations obtained via trace driven analysis on the traces listed in Fig. 7. Fig. 12. ....

....structures during a full week of disconnected transaction processing. We also use controlled experiments to measure the RVM cost for individual transactions using common workloads such as software development and document processing. In addition, we execute three different SynRGen micro models [2] as workloads representative of interactive transactions containing repetitive editing and compiling activities. Results. Fig. 13a displays the high water marks of RVM space cost recorded during trace driven simulation. The simulation assumes that the total RVM space cost for maintaining the ....

M.R. Ebling and M. Satyanarayanan, "SynRGen: An Extensible File Reference Generator," Proc. 1994.

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Maria R. Ebling and M. Satyanarayanan. SynRGen: An Extensible File Reference Generator. In Proceedings of the 1994 ACM SIGMETRICS Conference on Measurement and Modeling of Computer Systems, pages 108 -- 117, Nashville, TN, May 1994.

.... project coda Web coda.html Given below are the highlights from this list: ffl Server replication [12] ffl Conflict resolution [5, 6] ffl Disconnected operation [4, 13] ffl Weakly connected operation [9, 8] ffl Isolation only transactions [7] ffl Tools and building blocks [10, 2, 14] ffl Odyssey design [15, 11] ffl Dynamic sets [18, 17] ....

EBLING, M., AND SATYANARAYANAN, M. SynRGen: An Extensible File Reference Generator. In Proceedings of the 1994 ACM SIGMETRICS Conference (Nashville, TN, May 1994).

....Room The final scenario is intended to capture the effect of interfering wireless traffic rather than physical motion. The trace collection host is placed in a room with five other laptops also using WaveLAN. Each of the other laptops continuously executes a workload produced by SynRGen [5], a synthetic file reference generator. The synthetic workload models a user in a edit debug cycle on files stored on a remote NFS [15] file server. We refer to this scenario as the Chatterbox scenario, depicted in Figure 5. This figure differs from the depictions of the previous three scenarios ....

Ebling, M., and Satyanarayanan, M. SynRGen: An Extensible File Reference Generator. In Proceedings of the 1994 ACM SIGMETRICS Conference (Nashville, TN, May 1994).

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M. R. Ebling and M. Satyanarayanan. SynRGen: an extensible file reference generator. In Proceedings of SIGMETRICS, pages 108--117. ACM, 1994.

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Maria Ebling and M. Satyanarayanan. SynRGen: An extensible file reference generator. In Proceedings of the ACM SIGMETRICS Conference on May 1994.

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Ebling, M. R. and Satyanarayanan, M., "SynRGen: An Extensible File Reference Generator," in Proceedings of the 1994 ACM Sigmetrics Conference on Measurement and Modeling of Computer Systems, Nashville, TN, May 1994.

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