How a 40-Line Fix Eliminated a 400x Performance Gap | QuestDB

This blog post delves into an OpenJDK commit that replaced slow /proc file parsing with a single syscall, revealing a 400x performance gap. The change involved replacing complex file I/O and parsing with a direct clock_gettime() call, significantly improving performance. The post also explores further optimizations, including exploiting a fast-path in the Linux kernel for even better results.