CCL-Bench 1.0: A Trace-Based Benchmark for LLM Infrastructure. - Eric Ding 002; Byungsoo Oh; Bhaskar Kataria; Kaiwen Guo; Jelena Gvero; Abhishek Vijaya Kumar; Arjun Devraj; Lindsey Bowen; Atharv Sonwane; Emaad Manzoor; Rachee Singh (CoRR, 2026)