We dig through five generations of garbage collectors—from CMS to ZGC—using flame graphs, then pit modern JVM ZGC, Go 1.23, and a Rust async executor on the same Kafka-style workload to hunt lingering GC-driven latency spikes. See which runtime tames the tail.

By Codemia • Sep 13, 2025

8 min read

How CXL 3.0 replaces DMA-based zero copy with cache-coherent memory pooling for in-memory databases, featuring an experimental Redis fork that maps remote DRAM under 200 ns.

By Codemia • Sep 10, 2025

5 min read

Comparing six generations of TLS acceleration — from early user-space approaches like OpenSSL CLI hacks to modern in-NIC TLS offload with Kernel TLS and QUIC.

By Codemia • Aug 26, 2025

7 min read

This post traces the decline of the Linux page cache in modern databases and storage systems. It explores the shift from mmap() and buffered I/O to O_DIRECT, driven by SSD endurance improvements, NVMe Zoned Namespaces, and user-space filesystems. Featuring case studies of MySQL, ScyllaDB, and Redpanda, it highlights why these systems bypass the kernel cache to achieve predictable p99 latencies and tighter control over I/O.

By Codemia • Aug 20, 2025

8 min read