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Time profiler emits relative timestamps for events (the number of microseconds passed since the start of the current process). This patch allows combining events from different processes while preserving their relative timing by emitting a new attribute "beginningOfTime". This attribute contains the system time that corresponds to the zero timestamp of the time profiler. This has at least two use cases: - Build systems can use this to merge time traces from multiple compiler invocations and generate statistics for the whole build. Tools like ClangBuildAnalyzer could also leverage this feature. - Compilers that use LLVM as their backend by invoking llc/opt in a child process. If such a compiler supports generating time traces of its own events, it could merge those events with LLVM-specific events received from llc/opt, and produce a more complete time trace. A proof-of-concept script that merges multiple logs that contain a synchronization point into one log: https://github.com/broadwaylamb/merge_trace_events Differential Revision: https://reviews.llvm.org/D78030 |
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| bindings | ||
| cmake | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| projects | ||
| resources | ||
| runtimes | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitattributes | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| configure | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
The LLVM Compiler Infrastructure ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.