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About this paper
Jin Li, Jiawei Chen
Researchers at Harvard University, alongside an independent researcher, developed Worldline and WorldMove to enable bit-exact live migration of large, highly mutable GPU-resident states for interactive world models. This system supports efficient state relocation, achieving migration latencies as low as 16.6 ms within a node and 141-146 ms across a 100 GbE fabric for a 1.67 GB state, addressing the 'one user, one GPU' limitation.
Key insights
- The running state of interactive world models is intrinsically irreducible (lossy handles consistently break exact continuity) and highly mutable (up to 78% rewritten per step), making exact-state transfer a unique and critical challenge.
- End-to-end bit-identity verification is paramount for state integrity in high-speed datacenter fabrics, but integrating receiver-side checksumming requires incast-aware scheduling to prevent network instability and performance collapses.
- Live migration of active sessions is feasible through iterative pre-copy combined with lossless compression, effectively transforming statically provisioned GPUs into an elastic, shared resource pool for these demanding workloads.
Summary by alphaXiv.
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