I have compiled my code with specific flags (-Os, -O2, -march=native and their combinations) in order to produce a faster execution time.
But my problem is that I don't run always in the same machine (because in my lab there are several different machines). Sometimes I run within a MacOS, or within a Linux (in both cases with different OS versions).
I wonder if there is a way to determine which binary will be run depending on the environment where the binary will run (I mean cache size, cpu cores, and other properties about the specific machine)?. In other words, how to choose (when the program loads) the faster binary (previously compiled with different target binary sizes and instruction-set extensions) according to the specific machine used?
Thanks in advance.
You may prebuilt a bunch of executables and choose one according to environment variable or things like uname. A Better approach to the problem is choose a toolchain that is able to perform JIT, install-time optimization and/or runtime optimization, like llvm.