P2|rj;pmtn;pj=p|Σ Cj
The special case for a fixed number of m=2 machines was solved by
Herrbach and Leung in time O(n log n). It is a greedy algorithm with
small backtrack. It can easily be transformed into an online
algorithm with constant lookahead.
We implemented it with the fixed values nb jobs=10, nb machines=2, equal
processing time=60. You can change the release times by dragging the
scrollbars.