aaupov wrote: > However, I'm wondering if maybe we should disable llvm-suppot and only run > hello-world with -DCLANG_BOLT=perf.
Existing perf training is inadequate for collecting sampled profile – we simply don't get enough samples, and no-LBR mode further drops the performance. If we wanted to pursue perf sampling further, we'd need to extend perf training with either building LLVM subtargets or llvm-test-suite. > The bolt optimizations with perf only give about a 3% performance increase > (although maybe with hw counters this would be better) Yes, no-LBR mode has very limited benefit due to missing edge counts. > and it takes a very long time to convert all the perf profiles to the fdata > format. As discussed on Discord, we may be able to reduce the time by dropping `profile-format=yaml` which is not required in this case. By the way, although I understand the overhead adds up, we shouldn't be converting many profiles: I guess just two - one for cxx/helloworld and another for llvm-support. https://github.com/llvm/llvm-project/pull/119117 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
