How to generate preprocessing data on demand?

[GuopengLin]

Hi Keller,

Is there a way to generate preprocessing data on demand in MP-SPDZ? I notice that the virtual machine generates preprocessing data, such as daBits, in large batches. However, this results in excess data when I only need a single element for secure comparison. Is it possible to produce only the required amount of preprocessing data?

Additionally, I’m unclear about the meaning of the -B option (Batch size for sacrifice, default: 4). What does it control?