[Dirvish] Dirvish-runall in parallel mode?

[Arjan Schrijver]

Hi people,

Is it already possible to let dirvish-runall backup multiple vaults in 
parallel? By searching Google I have found several user submitted 
patches to do exactly that, but I can't find anything about it on the 
official Dirvish website or documentation.
Please tell me how I can do this. If it is not possible, please tell me 
how you reduce the time needed to backup a lot of servers (3 hours for 8 
servers at the moment).

Thanks,
Arjan