A cache hit is not free: inside Triton's compilation cache and hidden costs
Mahmoud_Zalt · x · 2026-10-09
AI solutions architect Mahmoud Zalt's new post, "A Cache Hit Is Not Free," dissects Triton's GPU compilation caching in compiler.py to expose an easily missed fact: a cache hit skips expensive lowering, but the work isn't done.
Key points:
- compiler.py coordinates two distinct pipelines — producing/retrieving compilation artifacts, and converting them into a launchable GPU module — joined by the CompiledKernel object, which separates "we have compilation output" from "this kernel can run on this device."
- After a hit, the system still reconstructs state, reads artifacts, and defers GPU work until first use: validate, load binary, then launch.
- ASTSource and IRSource normalize different inputs behind a shared interface (hash, IR, compile options); compile picks one backend and runs ordered backend stages only on a miss.
- Takeaway: a cache hit is a lifecycle milestone, not a claim that execution-ready work is complete — with design and operational guidance drawn from that model.
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