FastFly

A GPU simulator aiming at real-time or faster execution of the whole FlyWire brain, 139,255 neurons and 54.5 million synapses, on a single consumer NVIDIA card. The engineering is the point: leaky integrate-and-fire neurons, CSR sparse connectivity with FP16 weights, a push model that only processes synapses of neurons that actually fired, warp-ballot spike detection with bit-packed flags, and warp-per-spike load balancing. Connectivity comes from Shiu et al.'s v783 release and annotations from flywire_annotations.

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#cuda#gpu#realtime#lif#flywire