https://jasper-aa64.github.io/tags/perf/Recent content in Perf on JasperHugoen-usThu, 22 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/low-latency-perf-profiling/Thu, 22 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/low-latency-perf-profiling/stat for the totals, record and report to find the function holding 98% of the samples, annotate to see every sample land on the instruction after an add: a chain of adds, each waiting for the last, and splitting it four ways is 3.3 times faster. Without hardware counters, cpu-clock sampling still works; if the report shows only addresses, check the symbol table and the path the program runs from.