mix reader

Author: Haocheng

bench/mix_workload/README.md

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+# Mix Pair Benchmark
+
+This directory contains a batch script for benchmarking 2-trace mixed workloads.
+
+The script:
+- enumerates traces from `/mnt/cfs/oracleReuse/sample`
+- picks 1000 unique unordered 2-trace pairs
+- benchmarks each participating trace once by itself
+- benchmarks each mixed pair through the `mix` reader
+- writes one CSV table containing both solo and mixed miss ratios
+
+Example:
+
+```bash
+python3 bench/mix_workload/benchmark_mix_pairs.py \
+  --trace-dir /mnt/cfs/oracleReuse/sample \
+  --num-pairs 1000 \
+  --algo s3fifo \
+  --cache-size 256MB \
+  --jobs 4 \
+  --resume
+```
+
+Useful outputs next to `--output-csv`:
+- `*.manifest.csv`: the exact sampled pair list
+- `*.solo.csv`: cached single-trace results reused by pair rows
+
+If the run is interrupted, rerun with `--resume` to continue from the existing manifest and CSV files.