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Profile-guided optimization
source link: https://rigtorp.se/notes/pgo/
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Profile-guided optimization
2020-10-16Profile-guided optimization (PGO), also known as profile-directed feedback (PDF), and feedback-directed optimization (FDO) is a compiler optimization technique in computer programming that uses profiling to improve program runtime performance.
GCC PGO example
Build instrumented binary:
gcc foo.c -o foo_instrumented -fprofile-generate
Run instrumented binary with a representative workload:
./foo_instrumented
Then build optimized binary using generated profile:
gcc -O3 foo.c -o foo -fprofile-use=foo.gcda
Clang PGO example
Build instrumented binary:
clang foo.c -o foo_instrumented -fprofile-generate
clang foo.c -o foo_instrumented -fprofile-instr-generate
Run instrumented binary with a representative workload:
./foo_instrumented
Then build optimized binary using generated profile:
llvm-profdata merge -ouput foo.profdata default.profraw
clang -O3 foo.c -o foo -fprofile-use=foo.profdata
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