Well, I suppose we have a winner:
pyperf_bench_3_8_gcc_9_2.json
=============================
Performance version: 1.0.0
Report on Linux-4.15.0-76-generic-x86_64-with-glibc2.27
Number of logical CPUs: 4
Start date: 2020-03-13 19:36:17.585796
End date: 2020-03-13 20:35:09.605718
pyperf_bench_3_8_clang_9.json
=============================
Performance version: 1.0.0
Report on Linux-4.15.0-76-generic-x86_64-with-glibc2.27
Number of logical CPUs: 4
Start date: 2020-03-13 20:55:54.239018
End date: 2020-03-13 21:59:19.778522
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| Benchmark | pyperf_bench_3_8_gcc_9_2.json |
pyperf_bench_3_8_clang_9.json | Change | Significance |
+=========================+===============================+===============================+==============+=========================+
| 2to3 | 477 ms | 527 ms
| 1.11x slower | Significant (t=-210.10) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| chameleon | 13.2 ms | 15.9 ms
| 1.20x slower | Significant (t=-123.35) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| chaos | 155 ms | 193 ms
| 1.25x slower | Significant (t=-176.57) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| crypto_pyaes | 158 ms | 195 ms
| 1.24x slower | Significant (t=-81.20) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| deltablue | 10.2 ms | 12.1 ms
| 1.19x slower | Significant (t=-50.11) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| django_template | 69.4 ms | 80.9 ms
| 1.17x slower | Significant (t=-77.25) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| dulwich_log | 106 ms | 113 ms
| 1.06x slower | Significant (t=-62.12) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| fannkuch | 659 ms | 789 ms
| 1.20x slower | Significant (t=-62.44) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| float | 165 ms | 198 ms
| 1.20x slower | Significant (t=-124.75) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| genshi_text | 40.5 ms | 46.6 ms
| 1.15x slower | Significant (t=-111.00) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| genshi_xml | 87.3 ms | 97.2 ms
| 1.11x slower | Significant (t=-66.48) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| go | 361 ms | 434 ms
| 1.20x slower | Significant (t=-136.23) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| hexiom | 14.0 ms | 16.4 ms
| 1.17x slower | Significant (t=-103.53) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| html5lib | 143 ms | 157 ms
| 1.10x slower | Significant (t=-14.52) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| json_dumps | 18.2 ms | 20.8 ms
| 1.14x slower | Significant (t=-82.67) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| json_loads | 42.9 us | 46.0 us
| 1.07x slower | Significant (t=-42.16) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| logging_format | 13.8 us | 16.2 us
| 1.17x slower | Significant (t=-72.21) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| logging_silent | 265 ns | 332 ns
| 1.25x slower | Significant (t=-70.39) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| logging_simple | 12.4 us | 14.6 us
| 1.18x slower | Significant (t=-73.84) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| mako | 23.3 ms | 27.9 ms
| 1.20x slower | Significant (t=-159.94) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| mdp | 4.04 sec | 4.48 sec
| 1.11x slower | Significant (t=-213.27) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| meteor_contest | 164 ms | 170 ms
| 1.04x slower | Significant (t=-21.36) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| nbody | 191 ms | 228 ms
| 1.19x slower | Significant (t=-218.81) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| nqueens | 135 ms | 164 ms
| 1.22x slower | Significant (t=-177.49) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pathlib | 31.9 ms | 34.2 ms
| 1.07x slower | Significant (t=-57.08) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pickle | 16.4 us | 15.7 us
| 1.05x faster | Significant (t=6.08) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pickle_dict | 40.3 us | 42.8 us
| 1.06x slower | Significant (t=-49.42) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pickle_list | 6.58 us | 6.15 us
| 1.07x faster | Significant (t=47.82) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pickle_pure_python | 641 us | 746 us
| 1.16x slower | Significant (t=-93.74) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pidigits | 268 ms | 311 ms
| 1.16x slower | Significant (t=-965.71) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| pyflate | 969 ms | 1.16 sec
| 1.19x slower | Significant (t=-136.22) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| python_startup | 14.7 ms | 13.8 ms
| 1.06x faster | Significant (t=451.70) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| python_startup_no_site | 10.1 ms | 9.66 ms
| 1.04x faster | Significant (t=313.35) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| raytrace | 678 ms | 825 ms
| 1.22x slower | Significant (t=-138.92) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| regex_compile | 254 ms | 294 ms
| 1.16x slower | Significant (t=-92.31) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| regex_dna | 294 ms | 300 ms
| 1.02x slower | Not significant |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| regex_effbot | 4.43 ms | 5.15 ms
| 1.16x slower | Significant (t=-104.93) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| regex_v8 | 34.4 ms | 35.4 ms
| 1.03x slower | Significant (t=-9.57) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| richards | 96.5 ms | 121 ms
| 1.26x slower | Significant (t=-90.84) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| scimark_fft | 502 ms | 603 ms
| 1.20x slower | Significant (t=-177.78) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| scimark_lu | 207 ms | 254 ms
| 1.22x slower | Significant (t=-79.82) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| scimark_monte_carlo | 147 ms | 181 ms
| 1.24x slower | Significant (t=-97.62) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| scimark_sor | 279 ms | 339 ms
| 1.21x slower | Significant (t=-85.97) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| scimark_sparse_mat_mult | 6.54 ms | 7.67 ms
| 1.17x slower | Significant (t=-54.66) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| spectral_norm | 194 ms | 233 ms
| 1.20x slower | Significant (t=-211.46) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sqlalchemy_declarative | 259 ms | 269 ms
| 1.04x slower | Significant (t=-21.30) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sqlalchemy_imperative | 48.8 ms | 52.0 ms
| 1.06x slower | Significant (t=-15.79) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sqlite_synth | 4.34 us | 4.81 us
| 1.11x slower | Significant (t=-34.82) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sympy_expand | 722 ms | 761 ms
| 1.05x slower | Significant (t=-19.09) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sympy_integrate | 36.5 ms | 39.0 ms
| 1.07x slower | Significant (t=-59.33) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sympy_str | 485 ms | 519 ms
| 1.07x slower | Significant (t=-35.88) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| sympy_sum | 321 ms | 341 ms
| 1.06x slower | Significant (t=-46.38) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| telco | 9.03 ms | 9.97 ms
| 1.10x slower | Significant (t=-37.14) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| tornado_http | 234 ms | 246 ms
| 1.05x slower | Significant (t=-17.41) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| unpack_sequence | 94.7 ns | 102 ns
| 1.07x slower | Significant (t=-46.75) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| unpickle | 20.6 us | 24.9 us
| 1.21x slower | Significant (t=-53.21) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| unpickle_list | 6.69 us | 6.55 us
| 1.02x faster | Significant (t=7.28) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| unpickle_pure_python | 451 us | 544 us
| 1.21x slower | Significant (t=-105.28) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| xml_etree_generate | 135 ms | 156 ms
| 1.15x slower | Significant (t=-68.77) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| xml_etree_iterparse | 158 ms | 174 ms
| 1.10x slower | Significant (t=-59.12) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| xml_etree_parse | 232 ms | 258 ms
| 1.11x slower | Significant (t=-53.95) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
| xml_etree_process | 108 ms | 123 ms
| 1.14x slower | Significant (t=-95.42) |
+-------------------------+-------------------------------+-------------------------------+--------------+-------------------------+
I think that the competition with clang has moved GCC.
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