Chunk size decided by the thread count makes the UUID less deterministic
(e.g. across machines with different core counts.)
Follow ELF and just use a fixed chunksize.
Fixes: https://github.com/llvm/llvm-project/issues/63961
Reviewed By: #lld-macho, keith
Differential Revision: https://reviews.llvm.org/D155761
TimeTraceScope timeScope("Computing UUID");
ArrayRef<uint8_t> data{buffer->getBufferStart(), buffer->getBufferEnd()};
- unsigned chunkCount = parallel::strategy.compute_thread_count() * 10;
- // Round-up integer division
- size_t chunkSize = (data.size() + chunkCount - 1) / chunkCount;
- std::vector<ArrayRef<uint8_t>> chunks = split(data, chunkSize);
+ std::vector<ArrayRef<uint8_t>> chunks = split(data, 1024 * 1024);
// Leave one slot for filename
std::vector<uint64_t> hashes(chunks.size() + 1);
SmallVector<std::shared_future<void>> threadFutures;