dwarf-assembly/benching/hackbench/EVALUATION.md

Hackbench - evaluation

Artifacts saved in evaluation_artifacts.

Performance

Using the command line

for i in $(seq 1 100); do
  perf report 2>&1 >/dev/null | tail -n 1 \
    | python to_report_fmt.py | sed 's/^.* & .* & \([0-9]*\) & .*$/\1/g'
done

we save a sequence of 100 performance readings to some file.

Samples:

• eh_elf: 135251 unw/exec
• vanilla: 138233 unw/exec

Average time/unw:

• eh_elf: 102 ns
• vanilla: 2443 ns

Standard deviation:

• eh_elf: 2 ns
• vanilla: 47 ns

Average ratio: 24 Ratio uncertainty: 1.0

Distibution of unw_step issues

eh_elf case

• success: 135251 (97.7%)
• fallback to DWARF: 1467 (1.0%)
• fallback to libunwind heuristics: 329 (0.2%)
• fail to unwind: 1410 (1.0%)
• total: 138457

vanilla case

• success: 138201 (98.9%)
• fallback to libunwind heuristics: 32 (0.0%)
• fail to unwind: 1411 (1.0%)
• total: 139644