GCC 8/9 vs. LLVM Clang 7/8 Compiler Performance On POWER9 With The Raptor Talos II
OpenSSL built under GCC surprisingly was surprisingly around 7% faster than Clang, while on Linux x86_64 the performance comes to about the same.
Clang did pick up a few wins in the synthetic Cpp Performance Benchmarks test cases.
The current Clang 7.0.1 stable release also yielded faster performance for Redis.
The memcached mcperf benchmark appears to take a sizable performance hit under the GCC 9 development code.