A 40-line fix eliminated a 400x performance gap
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.
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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.