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This report led to the Transaction Processing Council, which in turn has led to eight benchmarks since its founding. TPC-C uses a database to simulate an order-entry environment of a wholesale supplier, including D. The summary results include both the performance metric and the price-performance of that metric. TPC-A, TPC-B, TPC-D, and TPC-R were retired. It runs five concurrent transactions of varying complexity, and the database includes nine tables with a scalable range of records and customers.

TPC-C is measured in transactions per minute (tpmC) and in price of system, including hardware, software, and three years of maintenance support. The cost of hardware, software, and maintenance agreements is included in a submission, which enables evaluations based on price-performance as well as high performance. The benchmarks are trying to model real systems, in which the demand on the system and the size of the data stored in it increase together. It makes no sense, for example, to have thousands of people per minute access hundreds of bank accounts.

Before results can be submitted, they must be approved by a certified TPC auditor, who enforces the TPC rules that johnson cycle to make sure that only fair results are submitted. Results can be challenged and disputes resolved by going before the TPC. Dues collected by TPC pay for an administrative structure including a chief operating office. This organization settles disputes, conducts mail ballots on Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum of changes to benchmarks, holds board meetings, and so on.

SPEC System-Level File Server, Mail, and Web Benchmarks The SPEC benchmarking effort is best known for its characterization of Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum performance, but it has created benchmarks for file servers, mail servers, and Diet vegan servers.

Seven companies agreed on a Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum benchmark, called SFS, to evaluate systems running the Sun Microsystems network file service (NFS). This benchmark was upgraded to SFS 3.

Measurements on NFS systems vitamina d3 kern pharma to a synthetic mix of reads, writes, and coq 10 operations. SFS supplies default parameters for comparative performance. For example, half of all writes are done in 8 KB blocks and half are done in partial blocks of 1, 2, or 4 KB.

Like Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum, SFS scales the amount of data stored according to the reported throughput: For hands shaking 100 NFS operations per second, fluoxymesterone capacity must increase by 1 GB.

It also limits dm rf average response time, in this case to 40 ms. Two processors reached 34,089 operations per second and four processors did 47,927. Reported in May 2005, these systems used the Data ONTAP 7. These disks were connected using two or four QLogic ISP-2322 Psorcon E Emollient Cream (Diflorasone Diacetate Cream)- FDA disk controllers.

Unfortunately, unlike the TPC benchmarks, SFS does not normalize for different price configurations. SPECMail is a benchmark to help evaluate performance of mail servers at an Internet service provider. SPECMail2001 is based on the standard Internet protocols SMTP and POP3, and it measures throughput and user response time while scaling the number of users from Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum to 1,000,000. SPECWeb is a benchmark for evaluating the performance of World Wide Web servers, measuring number of simultaneous user sessions.

The SPECWeb2005 workload simulates accesses to a Web service provider, where the server supports home pages for several organizations. It has three workloads: Banking (HTTPS), E-commerce (HTTP and HTTPS), and Support (HTTP). Antihistamines of Benchmarks of Dependability The TPC-C benchmark does in fact have a dependability requirement. The benchmarked system must Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum able to handle a single disk failure, which means in practice that all submitters are running some RAID organization in their storage system.

Efforts that are more recent have focused on the effectiveness of fault tolerance in systems. For a Web server, the obvious metrics are performance (measured as requests satisfied per second) and degree of fault tolerance (measured as the number of faults that can be tolerated by the storage subsystem, network pots disease topology, and so forth).

The example compared software RAID implementations provided by Linux, Solaris, and Windows 2000 Server. SPECWeb99 was used to provide a workload and to measure performance. To inject faults, one of the SCSI disks in the software RAID volume was replaced with an emulated disk. It was a PC running software using a SCSI controller that appears to other devices on the SCSI bus as a disk.

The disk emulator allowed the injection of faults. The faults injected included a variety of transient disk faults, such as correctable read errors, and permanent faults, such as disk media failures on writes. The two top graphs show Linux (on the left) and Solaris (on the right).

As RAID systems can lose data if a Desogestrel and Ethinyl Estradiol Tablets (Bekyree)- Multum disk fails before reconstruction completes, the longer the reconstruction (MTTR), the lower the availability.

Thus, there is a policy choice between taking a performance hit during reconstruction or lengthening the window of vulnerability and thus lowering the predicted MTTF. Note the difference in philosophy on speed of reconstruction of Linux versus Windows and Solaris. The y-axis is behavior in hits per second running SPECWeb99. The arrow indicates time of fault insertion.

Although none of the tested systems documented their reconstruction policies outside of the source code, even a single fault injection was able to give insight into those policies. The experiments revealed that both Linux and Solaris initiate automatic reconstruction of the RAID volume onto a hot spare when an active disk is taken out of service due to a failure.



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