APIs
How to Use gron and jq for Exploring Unknown JSON Fast
Explore unknown JSON from an API with gron and jq: flatten to greppable paths, find a value, list all paths with jq, then extract exactly what you need.
7 min read
Tag
performance
18 posts
Performance
How to Use perf stat and perf record for Quick Profiles
Use perf stat and perf record for quick profiles: read the counters, compare runs, sample call stacks, view the report and fix permission limits.
6 min read
Go
How to Use Go Concurrency to Speed Up File Processing
Speed up file processing in Go with a bounded worker pool or errgroup: walk the tree, hash files in parallel, collect results safely and measure honestly.
6 min read
Performance
What Is Fork and Exec and Why Spawning Costs Time Explained
Why spawning processes costs time: what fork and exec do, measuring a subprocess in a loop, builtins versus external commands, and when it matters.
6 min read
Performance
Why a Benchmark Lies and How Caches Change Results
Why a benchmark lies when caches change results: page cache, CPU, DNS and app caches, how to spot a cached run, and measuring cold and warm.
6 min read
Performance
How to Write a Benchmark You Can Trust in Real Scripts
Write a trustworthy benchmark for shell and script performance: warmups, repeated runs, same input, cache control, ratios, noise and what to report.
6 min read