llvm-project
llvm-exegesis
is a benchmarking tool that accepts or generates snippets and
can measure characteristics of those snippets by executing it while keeping track
of performance counters.
Currently Supported Platforms
is quite platform-dependent and currently only supports a couple
platform configurations for benchmarking. The limitations are listed below.
Analysis mode in
is supported on all platforms on which LLVM is.
Currently Supported Operating Systems for Benchmarking
Currently,
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 Supported Architectures for Benchmarking
Currently, using
for benchmarking is supported on the following
architectures:
- x86
- 64-bit only due to this being the only implemented calling convention
in
currently.llvm-exegesis
- 64-bit only due to this being the only implemented calling convention
in
- ARM
- AArch64 only
- MIPS
- PowerPC (PowerPC64LE only)
Note that not all 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
that would need to be implemented on other architectures
to bring up support.