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Dongha Yoon · Hansen Idden · Jinshu Liu · Berkay Inceisci · Sam H. Noh · Huaicheng Li
We present Cylon, a fast and extensible full-system emulator for CXL-SSDs built on FEMU. Cylon bridges the gap between closed hardware prototypes and slow software simulators by faithfully reproducing sub-μs cache hits and tens-of-μs misses that fall to NAND through a hybrid execution path that m...
Inho Song · Shoaib Asif Qazi · Javier González · Matias Bjørling · Sam H. Noh · Huaicheng Li
Flexible Data Placement (FDP) promises to reduce write amplification by steering writes across reclaim unit handles (RUHs), yet outcomes vary widely across devices. This paper presents WARP, the first open emulator and comprehensive study of FDP SSDs. Our cross-device, cross-workload characteriza...
Jeeyun Kim · Seonggyun Oh · Jungwoo Kim · Jisung Park · Jaeho Kim · Sungjin Lee · Sam H. Noh
Log-structured systems have become the backbone of modern data-intensive applications thanks to their high write throughput. Their efficiency, however, is deteriorated by the write amplification factor (WAF) induced by garbage collection. Despite extensive studies, there still exists a wide gap b...
Riwei Pan · Yu Liang · Sam H. Noh · Lei Li · Nan Guan · Tei-Wei Kuo · Chun Jason Xue
Modern computer systems are increasingly equipped with dozens to hundreds of cores, while high-performance Solid-State Drives (SSDs), enabled by NVMe and emerging technologies such as CXL-SSDs, provide massive I/O bandwidth and microsecond-scale latency. Yet, software overhead in the I/O stack re...