I am going to deploy a BOINC server for distributed volunteer computing and currently have very basic questions.

To simplify, let's say we have:

• a single resource-intensive computational task (i.e. a holistic, impartible application)
  
• two volunteers subscribed for the project
  

Questions:

• Is it possible to ensure that the application will be distributed between the volunteers (i.e. an application will be executed in two threads in this case, for better performance)
  
• Or do we need to divide the application into two tasks so that each task would be assigned to 1 volunteer?
  
• What part of the documentation can provide some details on this?
  

Have you read https://boinc.berkeley.edu/trac/wiki/ProjectMain?

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In most cases both clients will run the complete work, as there's always one to validate the results.

But if you had 4 or more clients, the situation would be different.

Boinc, fah, and others cut up the task and spread it between the clients (most of the time not considering the clients processing power).
To have a live distribution between the two clients might cost too much CPU and network bandwidth on the server side.

If you want a faster finish of a Wu, you'd spread an entire work over all the available clients, until one runs out of work, and give him work assigned to the slowest client.