Performance of computer system:
Computer performance is frequently described in terms of clock speed (usually in MHz or GHz). It refers to the cycles per second of the main clock of the CPU. Though, this metric is somewhat misleading, as a machine with a higher clock rate can not necessarily have higher performance. As a consequence manufacturers have moved away from clock speed as a measure of performance.
Computer performance may also be measured with the amount of cache a processor has. If the speed is measured MHz or GHz, were to be a car then the cache is like the gas tank. No matter how speedy the cargoes, it will still require to get gas. The higher the speed, and the greater the cache and the faster a processor run.
Modern CPUs may execute multiple instructions per clock cycle, which radically speeds up a program. Other factors influence speed, such like bus speeds, the mix of functional units, available memory, and the type and order of instructions in the programs being run.
There are 2major types of latency, speed and throughput. Latency is the time amongst the start of a procedure and its completion. Throughput is called the amount of work done per unit time. Interrupt latency is the definite maximum response time of the system to an electronic event (for example. when the disk drive finishes moving some data). Performance can be affected by a very wide range of design option- for instance, pipelining a processor generally makes latency worse (slower) but makes throughput better. Computers that control machinery generally required low interrupt latencies. These computers work in a real-time environment and fail if an operation is not completed in a particulars amount of time. For instance, computer-controlled anti-lock brakes must begin braking almost immediately after they have been instructed to brake.
The performance of a computer can be measured by using other metrics that depend upon its application domain. A system can be CPU bound (as in numerical calculation), memory bound (as in video editing) or I/O bound (as in a web serving application) or Power consumption has become essential servers and portable devices like laptops.
The benchmarking tries to take all these factors into account by measuring the time a computer takes to run through a series of test programs. Though benchmarking indicates strengths, it cannot help one to select a computer. Frequently the measured machines split on different measures. For instance, one system may handle scientific applications quickly, whilst another might play famous video games more smoothly. Furthermore, designers have been identified to add special features to their products, whether in software or hardware, which allow a particular benchmark to execute quickly but which do not offer same advantages to other, more common tasks.
A Functional Unit is described as a collection of computer systems and network infrastructure components which, when abstracted, may be more easily and clearly linked to the goals and objectives of the enterprise, ultimately behind the success of the enterprise's mission.
From a technological view, a Functional Unit is an unit that consists of and network infrastructure components or computer systems that deliver critical information asset s,1 through network-based services, to constituencies that are authenticated to that Functional Unit.