전체 글30 [SC'21] DeltaFS: A Scalable No-Ground-Truth Filesystem For Massively-Parallel Computing [SC'21] DeltaFS: A Scalable No-Ground-Truth Filesystem For Massively-Parallel Computing 1. Motivations Global synchronization Today's filesystem clients tend to synchronize too frequently with their servers. The inadequacy of the current state-of-art Today's filesystems map all application jobs to a single filesystem namespace. Filesystem metadata performance is limited by the amount.. 2022. 9. 6. [HotStorage'22] Lifetime-leveling LSM-tree compaction for ZNS SSD [HotStorage'22] Lifetime-leveling LSM-tree compaction for ZNS SSD 1. Motivations Problems from compaction in LSM-based KV stores with ZNS SSD Space amplification (Long-lived SSTs) Write amplification (Short-lived SSTs) 2. LL (Lifetime leveling) compaction algorithm Key principles Allocates dedicated zones for each level (For avoiding long-lived SSTs) Each compaction must involve all the lowe.. 2022. 7. 25. ATC & OSDI'22 7/11 KEY NOTE: Surprize-Inspired Networking what will be surplus? Edge capacity High resolution sensors how will future apps be different? they will be proactive E2C (Edge-to-Cloud) [ATC] ZNSwap: un-Block your Swap Motivation Swap on traditional SSDs certain performance anomalies Flash SSDs ZNSwap : new sw33ap subsystem for ZNS [OSDI] BlockFlex HarvestVMs: Promising for Improved Resource Utiliza.. 2022. 7. 18. [FAST'19] SLM-DB: Single-Level Key-Value Store with Persistent Memory [FAST'19] SLM-DB: Single-Level Key-Value Store with Persistent Memory 1. Motivations LSM-tree based KV stores are optimized to support write intensive workloads It has high R/W amplification and low read performance Recently, typical workloads has changed to have similar proportions of R/W KV stores need to be optimized for both read and write workloads 2. Optimization point Improve read perfoma.. 2022. 7. 18. [HotStorage'22] Compaction-Aware Zone Allocation for LSM based Key-Value Store on ZNS SSDs [HotStorage'22] Compaction-Aware Zone Allocation for LSM based Key-Value Store on ZNS SSDs 1. Motivations ZNS SSD Space management is moved from device to host Thus, application must perform zone cleaning Write amplification: When cleaning a zone, if valid data remains, this data should be copied to other zone To reduce WA, data with the same lifetime should be written in the same zone LIZA(LIfe.. 2022. 7. 18. [ATC'18] Redesigning LSMs for Nonvolatile Memory with NoveLSM [ATC'18] Redesigning LSMs for Nonvolatile Memory with NoveLSM 1. Critical problems on LSM when we use NVM Different in-memory and storage(persistent) form of the data High (de)serialization cost Only in-memory data can be changed. storage data is immutable. Limited memory capacity leads to frequent compaction, which increases stall time Becuase memory is volatile, updates must be logged. This al.. 2022. 7. 4. 이전 1 2 3 4 5 다음