Add kv state store#5
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This PR enhances the `visualize_throughput.py` script by adding a thread scaling visualization mode that enables you to analyze and compare benchmark performance across different thread counts, addressing the gap where Walrus supports thread scaling tests via make bench-scaling but previously lacked visualization tools for this data. The new --mode scaling option provides a dual-axis plot displaying both throughput (writes/second) and bandwidth (MB/s), overlaid with a perfect linear scaling reference line to easily identify scaling efficiency and bottlenecks, along with automatic computation of scaling efficiency percentages, speedup ratios, and detailed comparative metrics presented in both an on-plot statistics box and console summary. I kept in mind that the implementation maintains full backward compatibility with existing real-time monitoring functionality while adding flexible input handling through the `--thread-files` argument that accepts multiple CSV files in `THREADS:FILE` format, export capability via the `--output` flag for generating publication-ready plots.
Add thread scaling visualization to benchmark script in Walrus.
Track per topic cleanliness without expensive syscalls in hot path
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