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llvm-project/llvm/tools/llvm-exegesis
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Aiden Grossman 74a5e7784b
[llvm-exegesis] Close file descriptors after use (#86584) 
There are several insstances in the subprocess executor in llvm-exegesis
where we fail to close file descriptors after using them. This leaves
them open, which can cause issues later on if a third-party binary is
using the exegesis libraries and executing many blocks before exiting.
Leaving the descriptors open until process exit is also bad practice.
This patch fixes that by explicitly calling close() when we are done
with a specific file descriptor.

This patch fixes #86583.
2024-04-26 02:41:21 -07:00
..
lib
[llvm-exegesis] Close file descriptors after use (#86584)
2024-04-26 02:41:21 -07:00
CMakeLists.txt
Split out CodeGenTypes from CodeGen for LLT/MVT
2023-05-03 00:13:20 +09:00
llvm-exegesis.cpp
[llvm-exegesis] Use ExitOnErr instead of manually logging and exiting
2024-03-13 18:42:47 -07:00
README.md
[llvm-exegesis] Fix typos in README
2024-02-24 08:32:17 +00:00

README.md

llvm-exegesis

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

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 Supported Operating Systems for Benchmarking

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 Supported Architectures for Benchmarking

Currently, using llvm-exegesis for benchmarking is supported on the following architectures:

  • x86
    • 64-bit only due to this being the only implemented calling convention in llvm-exegesis currently.
  • 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 ./lib/X86/Target.cpp that would need to be implemented on other architectures to bring up support.