Pipeline scheduling

[raloos]

Processor function process() is called in one or several work threads which are managed by a scheduler. This scheduler is responsible for workload management and cache locality management, meaning that threads "walk" with a frame(number) through the pipeline.

[raloos]

First version implemented using QtConcurrentRun framework. Cache management is neglected for now, next part is making the scheduler actually schedule. This is only of use when there are LOSSY connections.

[raloos]

Ok, scheduler schedules using the partial graph ordering generated by the cycle check. To use all cores N pipeline stages are scheduled at the same time, where N is the number of virtual CPUs available. (virtual because of SMT enabled CPUs). So in the case of my Core i3 with 2 cores and 2-way SMT 4 pipeline stages are in flight at any given time.