llvm-exegesis is a benchmarking tool that accepts or assembles a snippet and can measure characteristics of that snippet by executing it while keeping track of performance counters.
llvm-exegesis is quite platform-dependent and currently only supports a couple platform configurations for benchmarking. The limitations are listed below. Analysis mode in llvm-exegesis is supported on all platforms on which LLVM is.
Currently, llvm-exegesis only supports benchmarking on Linux. This is mainly due to a dependency on the Linux perf subsystem for reading performance counters.
The subprocess execution mode and memory annotations currently only supports Linux due to a heavy reliance on many Linux specific syscalls/syscall implementations.
Currently, using llvm-exegesis for benchmarking is supported on the following architectures:
llvm-exegesis currently.Note that not benchmarking functionality is guaranteed to work on all platforms.
Memory annotations are currently only supported on 64-bit X86. There is no inherent limitations for porting memory annotations to other architectures, but parts of the test harness are implemented as MCJITed assembly that is generated in ./lib/X86/Target.cpp that would need to be implemented on other architectures to bring up support.