[SVS] Add TopKSearchDuringUpdate SVS benchmark#993
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Add benchmark for TopK searches during SVS backend index update
Which issues this PR fixes
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Low Risk
Benchmark-only changes with no API, serialization, or production VecSim logic modifications.
Overview
Adds a new
BM_TopKSearchDuringUpdateSVS benchmark to measure real time while parallel TopK queries run alongside a tiered index background update (flat buffer → SVS backend).The harness pre-fills the flat buffer to one vector below
update_threshold, then on each iteration triggers the update with oneAddVector, launchesn_parallel_searchesthreads each callingVecSimIndex_TopKQuery(fixed k=100, window_size=200), joins them, and waits for the mock thread pool to finish the update. Benchmark args sweep update_threshold (block size / 5k / 10× block), 10 vs 50 concurrent searches, and 2 vs 4 index thread-pool threads; registration is wired in the fp32 SVS basics init header like the existing tiered benchmarks.Reviewed by Cursor Bugbot for commit 3110ad0. Bugbot is set up for automated code reviews on this repo. Configure here.