forked from OSchip/llvm-project
3464dac0ca
Race deduplication code proved to be a performance bottleneck in the past if suppressions/annotations are used, or just some races left unaddressed. And we still get user complaints about this: https://groups.google.com/forum/#!topic/thread-sanitizer/hB0WyiTI4e4 ReportRace already has several layers of caching for racy pcs/addresses to make deduplication faster. However, ReportRace still takes a global mutex (ThreadRegistry and ReportMutex) during deduplication and also calls mmap/munmap (which take process-wide semaphore in kernel), this makes deduplication non-scalable. This patch moves race deduplication outside of global mutexes and also removes all mmap/munmap calls. As the result, race_stress.cc with 100 threads and 10000 iterations become 30x faster: before: real 0m21.673s user 0m5.932s sys 0m34.885s after: real 0m0.720s user 0m23.646s sys 0m1.254s http://reviews.llvm.org/D12554 llvm-svn: 246758 |
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| lib | ||
| make | ||
| test | ||
| unittests | ||
| www | ||
| .arcconfig | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| Makefile | ||
| README.txt | ||
README.txt
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================