Configure number of mirror vertices and replicate runs of asynchronous engine

[Vicky]

Hello,

Is there a way to configure the number of mirrors that each vertex has?

Moreover, I need to measure the running time of PageRank using the asynchronous engine once with some changes that I make and once without. For this, I need the two runs to follow the same computation path. Can this be achieved using the asynchronous engine or do I need to use the synchronous?

Thank you!