performance - JMeter:高斯随机计时器与泊松随机计时器

Question

我试图找出用于我的负载测试的计时器，以模拟网站流量的逐渐增长。
我看了一下高斯随机计时器的广告:

To delay every user request for random amount of time use Gaussian Random Timer with most of the time intervals happening near a specific value.

和泊松随机计时器:

To pause each and every thread request for random amount of time use Poisson Random Timer with most of the time intervals occurring close a specific value.

取自 this source.

现在我真的不明白这两者之间有什么区别。它们都应用了更可能接近特定值的随机延迟。那么我错过了什么？它们在实践中有何不同？

Answer 1

不同之处在于用于生成随机值的算法:

泊松基于此:

http://en.wikipedia.org/wiki/Poisson_distribution

http://www.johndcook.com/blog/2010/06/14/generating-poisson-random-values/

高斯用途:

java.util.Random#nextGaussian()

两者都将基于泊松或高斯生成的随机数的值添加到 Constant Delay Offset 中。