Benchmarking NVMe-backed Managed Postgres: PlanetScale and ClickHouse

PostgresBench, an open-source benchmarking tool for evaluating managed PostgreSQL services, recently incorporated PlanetScale Postgres into its evaluation alongside ClickHouse Managed Postgres, following community feedback. The benchmark used PostgreSQL's standard pgbench tool with a TPC-B-like workload and was conducted on identical AWS hardware, ensuring fair comparison of the two services. Results showed that ClickHouse Managed Postgres consistently outperformed PlanetScale Postgres, delivering up to 54% higher throughput and significantly lower latencies. The performance advantage of ClickHouse is attributed to system-level optimizations, such as memory management using 2 MB huge pages and optimized write paths with wal_compression, which are absent in PlanetScale. These engineering enhancements reduce CPU, memory, and I/O overhead, contributing to ClickHouse's superior performance. The blog suggests that while the benchmark results are indicative, users should validate performance with their own workloads for accurate assessment.

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