Observed Signal · Apr 12, 2026 · Benchmark · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Realistic PostgreSQL Transactional Write Ceiling ≈1,875 rps
An engineering benchmark and analysis of PostgreSQL write performance finds that realistic single-row transactional writes saturate far below common synthetic claims. Using PostgreSQL 18.3 on a 16-core AMD Ryzen 9 7950X, NVMe storage and 62 GB RAM, the author measured a production-like OLTP workload (multi-statement transactions, indexes, partitioning, WAL durability) and observed a sustained ceiling of ~1,875 committed transactional writes/sec with synchronous_commit=on. Synthetic tests that report tens or hundreds of thousands of inserts/sec typically remove real-world constraints (no indexes, fsync off, unlogged tables, bare INSERTs). The post explains WAL flushing as the fundamental serialized bottleneck, compares workload shapes, quantifies the synchronous_commit gap, and gives practical thresholds for when teams should plan horizontal write-scaling.
Provides realistic, production-focused PostgreSQL write-throughput measurements and explains WAL-related limits; useful for teams planning transactional scaling but not a major industry-wide platform change.
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Key Takeaways & Evidence Grounding
- Benchmark repo published at github.com/HaikAsatryan/pg-bench-real
- Hardware used: AMD Ryzen 9 7950X (16 cores/32 threads), 62 GB DDR5, WD_BLACK SN850X 2 TB NVMe, Fedora 43; PostgreSQL 18.3
- Standard multi-statement OLTP write (synchronous_commit=on) ceiling ≈1,875 committed transactions/sec (knee 1,875–2,046 rps)
- Banking transfer workload ceiling ≈2,390 rps (synchronous_commit=on) and ≈2,734 rps (synchronous_commit=off), a ~15% improvement
- Common benchmark shortcuts that inflate write rates include disabling fsync, turning off synchronous_commit, using unlogged tables, removing indexes, and avoiding real transaction logic
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