VSL random number generators are optimized for latest Intel(R) processors, including Intel(R) Xeon(R) processor X5570, Intel(R) Xeon(R) processor E7-4870, and Intel(R) Xeon(R) E5-2690 processor. For earlier Intel processors, VSL generators are fully functional, yet not specifically optimized.
The value of CPE (Clocks Per Element), which is independent from the processor clock rate, is selected as a unit of measurement. For example, if the generator performance is equal to 10 CPE and the processor rate is 1 GHz, then the generator will produce 108 random numbers per second.
The VSL BRNGs differ from each other in speed, therefore data on performance of general (discrete and continuous) distribution generators is given separately for each BRNG used as an underlying generator to produce uniformly distributed random numbers.
Performance of a general distribution generator also depends on a method chosen for transforming a uniform distribution to a given non-uniform one. This requires specifying the applied transformation method as well.
The length of a generated vector is another factor influencing the performance of the VSL vector type generators. Calling generators on short vector lengths may prove highly ineffective. See the figure for the typical interdependence between the generator performance and the vector length.
The tables of RNG performance provide speed data obtained using the most indicative vector length of 1000 elements. For other vector lengths the performance of any generator behaves approximately in the same way as shown in the following graph.
Generator performance may vary according to probability distribution parameters. The tables provide performance data only for fixed parameter values (or fixed intervals of parameter variations). Table footnotes contain parameters with which a given performance is obtained. For some transformation methods the performance is approximately the same on a wide range of parameters, such methods being called uniformly fast, while for others the performance may vary considerably with variation in the distribution parameters, for example, in PTPE method for an RNG of Poisson distribution. When the latter is the case, graphs of interdependence between the performance and the distribution parameters are provided.
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