QuestDB Blog

QuestDB is the open-source time-series database for demanding workloads: ultra-low latency, high throughput, tiered storage, and fast SQL on open formats.

Popular posts: 3
Total points: 749
HN comments: 155
Rank: #1,782 company

Visit questdb.com → On Hacker News Sep 2025 – Jan 2026

Software Engineering 3 Systems & Performance 2 Programming Languages 1

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A 40-line fix eliminated a 400x performance gap

2026370 points78 comments Systems & Performance details

How a 40-line OpenJDK fix swapped slow /proc parsing for a single clock_gettime syscall, closing a 400x thread CPU-time gap hidden for 20 years.

From Rust to reality: The hidden journey of fetch_max

2025259 points59 comments Software Engineering details

Tracing Rust AtomicU64::fetch_max from macro expansion and rustc intrinsics through LLVM atomicrmw umax down to the final x86-64 CAS loop.

A kernel bug froze my machine: Debugging an async-profiler deadlock

2025120 points18 comments Systems & Performance details

How I investigated and worked around a kernel bug that caused async-profiler to freeze my machine whenever I tried to use a profiler.