When using any of the builtin random number distributions you have the choice of what random number generator used for uniform random numbers that most distributions when generating their more complex shapes.
For the most part this can be ignored. If you are running an important simulation you might consider doing multiple runs using the various generators and comparing the results. In the unlikely event that the underlying random number generator is skewing results, this test will highlight the fact by one of the three generators causing a different end result.
The available generators are 
Generator Name 
distributionGenerator attribute value 
More information. 
Additive Lagged Fibonacci 
alf (default if omitted) 

Mersenne Twister 
mt19937 

xorshift with period 2^1281 
xordshift128 
0 Comments