absmith1

Very poor Python performance on EPYC 7601

Discussion created by absmith1 on Jun 1, 2018
Latest reply on Jun 3, 2018 by hardcoregames™

Hello,

I am benchmarking and AMD EPYC 7601 vs Intel 6148. Both systems are identical re: O/S:

 

Red Hat Enterprise Linux Server release 7.5 (Maipo)

gcc (GCC) 7.2.0

 

Python 3.6.5 been built from source using both these methods:

 

./configure --prefix=/home/andrew.york/Python-3.6.5-EPYC-bin --enable-optimizations

CFLAGS='-O3 -march=znver1' ./configure --prefix=/home/andrew/Python-3.6.5-EPYC-bin --enable-optimizations

 

The second method gives slightly slower results. But the the standard Python benchmarks comparing AMD and Intel performance shows that Python is not being built for the correct architecture:

 

+-------------------------+----------------+------------------------------+

| Benchmark               | AMD 7601 | Intel 6148                |

+=========================+================+==============================+

| 2to3                    | 681 ms         | 397 ms: 1.72x faster (-42%)  |

+-------------------------+----------------+------------------------------+

| chameleon               | 23.7 ms        | 12.0 ms: 1.98x faster (-49%) |

+-------------------------+----------------+------------------------------+

| chaos                   | 262 ms         | 138 ms: 1.90x faster (-47%)  |

+-------------------------+----------------+------------------------------+

| crypto_pyaes            | 222 ms         | 127 ms: 1.74x faster (-43%)  |

+-------------------------+----------------+------------------------------+

| deltablue               | 17.2 ms        | 9.72 ms: 1.77x faster (-44%) |

+-------------------------+----------------+------------------------------+

| django_template         | 320 ms         | 159 ms: 2.01x faster (-50%)  |

+-------------------------+----------------+------------------------------+

| fannkuch                | 1.00 sec       | 575 ms: 1.74x faster (-43%)  |

+-------------------------+----------------+------------------------------+

| float                   | 243 ms         | 138 ms: 1.77x faster (-43%)  |

+-------------------------+----------------+------------------------------+

| genshi_text             | 76.8 ms        | 36.3 ms: 2.12x faster (-53%) |

+-------------------------+----------------+------------------------------+

 

 

Can any one shed some light on what may be going on?

 

Many thanks,

 

Andrew

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