What affects the execution time of a program?

Therefore, the end user needs to control how the specific input data used for the program, the specific state of the operating system, the specific location of the program in memory, etc. will influence execution time in each experiment.

Why is execution time different?

Its just understanding of OS scheduler for your program execution, It varies all time. In modern computers, all is designed to statistically optimize the average run time. But many architectural features are based on statistic and depending on the initial conditions can lead to very different run times.

Why is the execution time different for each trial?

The execution time of each job instance from the same task is likely to differ. Common sources of variation are path data dependencies (the path taken through the code depends on input parameters) and hard-to-predict hardware features such as branch prediction, instruction pipelining and caches.

What is variation in programming?

Variability is cap- tured in localized choices between alternatives. The space of all variations is organized by dimensions, which provide scoping and structure to choices.

What are different factors for affecting the time complexity?

1. Parallelism – A multi-threaded program running on multicore machine will be faster. 2. CPU Utilization – If CPU is already utilized by some other processes then running time of algorithm will increase.

What does influence the frequency of instruction execution?

CPI is affected by instruction-level parallelism and by instruction complexity. Without instruction-level parallelism, simple instructions usually take 4 or more cycles to execute. Instructions that execute loops take at least one clock per loop iteration.

How performance is related to execution time?

Performance is determined by execution time as performance is inversely proportional to execution time. If given that Processor A is faster than processor B, that means execution time of A is less than that of execution time of B. Therefore, performance of A is greater than that of performance of B.

How do I reduce program execution time?

We can simply use two sentence in the body of main can reduce the execution time in cpp; ios_base::sync_with_stdio(false); cin.tie(NULL); When we use this it reduces execution time of the program .

What is CPU execution time?

CPU execution time is the total time a CPU spends computing on a given task. It also excludes time for I/O or running other programs. This is also referred to as simply CPU time.

What is a variation point in a software product line?

A software product line captures the commonalities between a set of products while providing for the differences. The whole of variation points is typically referred to as the variability of the software product line.

What is variation points?

A variation point is a point of choice on some Rational Rhapsody elements that imply products might differ with respect to those elements.

What are the sources of variation in the execution of instructions?

The pipeline is one important source of variation. The execution time of an instruction depends in part on the behavior of other instructions in the pipeline. Two instructions that compete for the same resource will execute more slowly when executed together than if they were executed at widely separated times.

Can we control execution times through simulation?

However, short execution times can cause scheduling problems that do not occur when all programs run to the worst-case limits, so a more helpful strategy is to measure both worst-case and best-case execution times. We cannot bound execution times through simulation because interesting programs have far too many input combinations to enumerate.

How is the execution time of the program computed?

The execution time of the program was computed as the sum of the execution times of the statements. They added a MAX COUNT construct to their programming language to allow programmers to specify the maximum number of times that a loop will be executed.

What determines the execution time of an instruction?

The execution time of an instruction depends in part on the behavior of other instructions in the pipeline. Two instructions that compete for the same resource will execute more slowly when executed together than if they were executed at widely separated times. The memory system is an even larger source of variation.