  The compute efficiency of Monte-Carlo event generators for the Large Hadron
Collider is expected to become a major bottleneck for simulations in the
high-luminosity phase. Aiming at the development of a full-fledged generator
for modern GPUs, we study the performance of various recursive strategies to
compute multi-gluon tree-level amplitudes. We investigate the scaling of the
algorithms on both CPU and GPU hardware. Finally, we provide practical
recommendations as well as baseline implementations for the development of
future simulation programs. The GPU implementations can be found at:
https://www.gitlab.com/ebothmann/blockgen-archive.
