Bench: evaluate gzip

benching/gzip/.gitignore

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+gzip
+gzip-1.10
+perf.data

benching/gzip/EVALUATION.md

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+# gzip - evaluation
+
+Artifacts saved in `evaluation_artifacts`.
+
+## Performance
+
+Using the command line
+
+```bash
+for i in $(seq 1 100); do
+  perf report 2>&1 >/dev/null | tail -n 1 \
+    | python ../hackbench/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`:  331134 unw/exec
+* `vanilla`: 331144 unw/exec
+
+Average time/unw:
+* `eh_elf`:    83 ns
+* `vanilla`: 1304 ns
+
+Standard deviation:
+* `eh_elf`:   2 ns
+* `vanilla`: 24 ns
+
+Average ratio: 15.7
+Ratio uncertainty: 0.8
+
+## Distibution of `unw_step` issues
+
+### `eh_elf` case
+
+* success:                              331134 (99.9%)
+* fallback to DWARF:                         2  (0.0%)
+* fallback to libunwind heuristics:          8  (0.0%)
+* fail to unwind:                          379  (0.1%)
+* total:                                331523
+
+### `vanilla` case
+
+* success:                              331136 (99.9%)
+* fallback to libunwind heuristics:          8  (0.0%)
+* fail to unwind:                          379  (0.1%)
+* total:                                331523