That is easier to do when the CPU has low interrupt latency and when it has deterministic response. System designers building real-time computing systems want to guarantee worst-case response. The latency is the delay between the process instruction commanding the transition and the hardware actually transitioning the voltage from high to low or low to high. The operating system may choose to adjust the scheduling of each transition (high-low or low-high) based on an internal clock. For example, suppose a process commands that a computer card's voltage output be set high-low-high-low and so on at a rate of 1000 Hz.
In addition, the operating system can schedule when to perform the action that the process is commanding. In operating systems, the execution of the process can be postponed if other processes are also executing. In the field of human-machine interaction, perceptible latency (delay between what the user commands and when the computer provides the results) has a strong effect on user satisfaction and usability.Ĭomputers run sets of instructions called a process. In reliable two-way communication systems, latency limits the maximum rate that information can be transmitted, as there is often a limit on the amount of information that is "in-flight" at any one moment. In communications, the lower limit of latency is determined by the medium being used for communications. The precise definition of latency depends on the system being observed and the nature of stimulation. Therefore, every physical system that has non-zero spatial dimensions will experience some sort of latency. This velocity is always lower or equal to speed of light. Latency is a result of the limited velocity with which any physical interaction can take place. Latency is a time delay between the cause and the effect of some physical change in the system being observed. However, sometimes pushing one type of performance to an extreme leads to a CPU with worse overall performance, because other important aspects were sacrificed to get one impressive-looking number, for example, the chip's clock rate (see the megahertz myth).Īpplication performance engineering For example, building the CPU out of better, faster transistors.
Occasionally a CPU designer can find a way to make a CPU with better overall performance by improving one of the aspects of performance, presented below, without sacrificing the CPU's performance in other areas. Performance engineering continuously deals with trade-offs between types of performance. Performance engineering within systems engineering encompasses the set of roles, skills, activities, practices, tools, and deliverables applied at every phase of the systems development life cycle which ensures that a solution will be designed, implemented, and operationally supported to meet the performance requirements defined for the solution.
#Benchmark my pc to others computers software
The word performance in computer performance means the same thing that performance means in other contexts, that is, it means "How well is the computer doing the work it is supposed to do?" As an aspect of software quality Ĭomputer software performance, particularly software application response time, is an aspect of software quality that is important in human–computer interactions. Whilst the above definition relates to a scientific, technical approach, the following definition given by Arnold Allen would be useful for a non-technical audience: Compared relative to other systems or the same system before/after changes.The performance of any computer system can be evaluated in measurable, technical terms, using one or more of the metrics listed above. High availability of the computing system or application.Fast (or highly compact) data compression and decompression.Low utilization of computing resource(s).High throughput (rate of processing work).
Short response time for a given piece of work.When it comes to high computer performance, one or more of the following factors might be involved: Outside of specific contexts, computer performance is estimated in terms of accuracy, efficiency and speed of executing computer program instructions. In computing, computer performance is the amount of useful work accomplished by a computer system. Amount of useful work accomplished by a computer
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