A new scheduling algorithm for the LHCb upgrade trigger application

During Run 3 of the LHC the LHCb detector will process a 30 MHz event rate with a full detector readout followed by a software trigger. To deal with the increased computational requirements, the software framework is reviewed and optimized on a large scale. One challenge is the efficient scheduling of $O(10^3)$-$O(10^4)$ algorithms in the High Level Trigger (HLT) application. This document describes the design of a new algorithm scheduler which allows for static-order intra-event scheduling with minimum complexity while still providing the required flexibility.