Tag: performance

On Aug 6, 2026 ElastiCache added Graviton4 M8g/R8g/C8gn for Valkey and Memcached — up to 47% higher throughput, 43% lower P99, 31% better price-performance vs Graviton3. Field guide: family pick, RI traps, canary checklist.

Synthetics prove a journey works from AWS; RUM shows what real browsers experience — LCP, CLS, INP. Sampling, privacy, cost, and when Application Signals still owns backend SLOs.

On a composite B2B order API (~2.4k RPS peak, 24 ECS tasks on Aurora), running the scaling ladder in order — RDS Proxy, read-replica routing, ElastiCache, then SQS offload — moved modeled p99 from 1,840 ms to 72 ms before any microservice split.

Bloom filters shave 90% of negative lookups; HyperLogLog estimates cardinality without storing every user ID. Redis modules on ElastiCache for abuse detection and feed deduplication.

Two goroutines updating adjacent counters can saturate memory bus on a c7g.8xlarge. Memory barriers, cache lines, and false sharing—why placement groups do not fix application-level contention.

Too many "too many connections" pages are fixed by raising max_connections—which trades one outage for OOM on the writer. This guide traces deadlocks, pool sizing, RDS Proxy, and prepared statement caching on Aurora.

Cache-aside without an invalidation story ships stale pricing to 2% of users—the hardest 2% to debug. This guide layers CloudFront, ElastiCache, and DAX with TTL, event-driven purge, and when write-through beats cache-aside.

C10k is solved until syscall overhead and context switches eat your Graviton cores. epoll, sendfile, and SO_REUSEPORT behaviors on EC2—and why Lambda caps concurrency differently.

Heap too small triggers G1 humongous allocations; too large balloons pause times on Graviton. Corretto on ECS/EKS/Lambda Java—when ZGC generational beats G1 for API heaps.

Packet loss on mobile networks still punishes HTTP/1.1 head-of-line blocking—but HTTP/3 only helps if CloudFront terminates QUIC and your origin connection pools are sized for multiplexed streams. This guide connects Reno, Cubic, BBR, HPACK, and QUIC to ALB and CloudFront decisions.

Project Loom virtual threads help I/O-bound Java on ECS—not CPU-bound aggregation. Compare actor models, lock-free queues, and when Lambda concurrency beats pinning threads on EC2.

On June 10, 2026 AWS GA’d M9g/M9gd on Graviton5 — up to 25% more compute vs M8g, 35% faster for web and ML per AWS. Field guide: M9g vs M9gd, canary checklist, RI traps, and agentic-AI fit. Compute-optimized sibling C9g/C9gd GA June 30.