Profiling a Rust hot loop with perf
WHAT IT TESTS: low-level performance profiling. OUTLINE: build with debuginfo, perf record cycles or cache-misses, perf report then perf annotate to map counters to source/asm; flamegraph for hotspots.
WHAT IT TESTS: ability to go beyond microbenchmarks to hardware counters. ANSWER OUTLINE: compile a release build but keep debuginfo via Cargo profile settings so symbols map back to source. Use perf record with events like cycles, instructions, and cache-misses, then perf report to find hot functions and perf annotate to overlay counters on disassembly and source. Cargo-flamegraph visualizes the stack. Watch IPC and cache-miss ratios to spot memory-bound code. RED FLAG: profiling a debug build or trusting only wall-clock timing.
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- #rust
- #perf
- #profiling
- #cache
- #performance
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