Tigon: A Distributed Database for a CXL Pod
summary
Tigon implements a distributed transactional in-memory database for a CXL pod, running on an emulated 8-host setup (40-core machine + CXL 1.1 module). It partitions data in local DRAM and moves only remotely accessed data into CXL, compacting coherence metadata to eight bytes and using a software cache coherence protocol to avoid constant migrations. It uses CXL atomic operations to synchronize cross-host accesses, reduces message exchanges, and reports up to 2.5× throughput vs optimized shared-nothing and up to 18.5× vs an RDMA system.
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chapters (9)
- 0:00Tigon and CXL pod intro
- 2:51CXL tech and shared memory
- 5:21Naive CXL database scaling
- 7:49Tigon’s Pasha architecture
- 9:35Reducing data movement
- 10:59Avoiding two-phase commit
- 12:03Tigon toy example
- 13:51Evaluation and benchmarks
- 17:50Summary and future
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