Feat/autotune observability#1437
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…checks and helper functions
This reverts commit 64b697d.
…st element in tuner validation
The peak-throughput probe allocates up to 512MB x2 in the exclusive memory pool. The handles drop when measurement returns, but the pool frees pages only during a cleanup pass, and CUDA runs none on the normal path, so the buffers stayed reserved (~3.9GB on a 16GB card) for the rest of the process. Call memory_cleanup() after the one-time measurement so the pages are returned to the driver immediately.
This was referenced Jul 17, 2026
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