https://blog.sagamiyun.me • This is a web feed, also known as an Atom feed. Subscribe by copying the URL from the address bar into your newsreader. Visit About Feeds to learn more and get started. It's free. Visit website Recent posts Updated on $DATE dark date rl Kit Kyo - rl Full-stack engineer · DevOps · agent development — currently going deep on ML & infrastructure. Zola2026-06-20T00:00:00+00:00https://blog.sagamiyun.me/tags/rl/atom.xml Kill the tail, not the cores: profiling the verifier under RL-with-verifiers 2026-06-20T00:00:00+00:00 2026-06-20T00:00:00+00:00 Kit Kyo · A2O Labs https://blog.sagamiyun.me/blog/kill-the-tail-not-cores/ As RL-with-verifiers scales, the Lean verifier is both the reward source and the throughput bottleneck — a CPU/scheduling problem almost nobody benchmarks on commodity, on-prem hardware. We profiled it: on an 8-core box, ~4.5% of proofs run away and eat most of the single-thread wall, and a tuned per-proof deadline beats adding cores. The honest-measurer story (including the claim we had to retract) is the point.