Benchmarking The Linux Kernel With An "-O3" Optimized Build
The PostgreSQL database server when being overloaded with queries did find some gains out of the -O3 optimized kernel image.
For some RocksDB database server benchmarks there were some small improvements exhibited with the -O3 kernel build.
Memcached was one of the only other areas of real-world significance benefiting from the -O3 kernel build.
Not all database systems were benefiting from an -O3 kernel build...