PostgresBench: Measuring the impact of High Availability on Managed Postgres performance

PostgresBench, an open-source tool for benchmarking managed Postgres performance across various vendors, has expanded its scope to include high availability (HA) configurations, addressing community feedback. The benchmark focuses on the performance cost of achieving HA and data durability in managed Postgres services, rather than a complete comparison of HA setups. It compares shared-nothing architectures, like ClickHouse Managed Postgres, AWS RDS, and Crunchy Bridge, which use isolated compute and storage with PostgreSQL replication, against shared-storage architectures, such as AWS Aurora and Neon, which separate compute and storage for durability. The results highlight ClickHouse Managed Postgres's superior throughput and latency in both shared-nothing and shared-storage categories, particularly with zero data loss configurations. The benchmark aims to enhance understanding of performance impacts and invites community contributions to expand its utility. Future plans include incorporating more providers, customizing benchmark durations, and analyzing cost-performance trade-offs, positioning PostgresBench as a standard tool for evaluating managed Postgres services.

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