GCC Benchmarks At Varying Optimization Levels With Core i9 10900K Show An Unexpected Surprise

Written by Michael Larabel in Software on 27 July 2020 at 10:07 AM EDT. Page 3 of 4. 59 Comments.

The TSCP chess benchmark sees better performance on GCC 10 both for "-O3 -march=native" plus LTO improving over GCC 9, but the -O2 performance here also came in much lower.

John The Ripper saw the most severe hits at "-O2" with GCC 10 of all the tests we ran. Seeing such low -O2 performance on the GCC 10.2 snapshot is something I don't believe I've seen previously with the GCC 10 benchmarking in recent months.

The nosedive in GCC 10 "-O2" performance was also observed for GraphicsMagick.

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