forked from OSchip/llvm-project
09158252f7
Before this patch, it wasn't possible to extend the ThinLTO threads to all SMT/CMT threads in the system. Only one thread per core was allowed, instructed by usage of llvm::heavyweight_hardware_concurrency() in the ThinLTO code. Any number passed to the LLD flag /opt:lldltojobs=..., or any other ThinLTO-specific flag, was previously interpreted in the context of llvm::heavyweight_hardware_concurrency(), which means SMT disabled. One can now say in LLD: /opt:lldltojobs=0 -- Use one std::thread / hardware core in the system (no SMT). Default value if flag not specified. /opt:lldltojobs=N -- Limit usage to N threads, regardless of usage of heavyweight_hardware_concurrency(). /opt:lldltojobs=all -- Use all hardware threads in the system. Equivalent to /opt:lldltojobs=$(nproc) on Linux and /opt:lldltojobs=%NUMBER_OF_PROCESSORS% on Windows. When an affinity mask is set for the process, threads will be created only for the cores selected by the mask. When N > number-of-hardware-threads-in-the-system, the threads in the thread pool will be dispatched equally on all CPU sockets (tested only on Windows). When N <= number-of-hardware-threads-on-a-CPU-socket, the threads will remain on the CPU socket where the process started (only on Windows). Differential Revision: https://reviews.llvm.org/D75153 |
||
|---|---|---|
| .. | ||
| Inputs | ||
| archive.ll | ||
| atomics.ll | ||
| cache.ll | ||
| comdat.ll | ||
| diagnostics.ll | ||
| export.ll | ||
| import-attributes.ll | ||
| incompatible.ll | ||
| internalize-basic.ll | ||
| libcall-archive.ll | ||
| libcall-truncsfhf2.ll | ||
| lto-start.ll | ||
| opt-level.ll | ||
| parallel.ll | ||
| relocatable-undefined.ll | ||
| relocatable.ll | ||
| save-temps.ll | ||
| signature-mismatch.ll | ||
| thinlto.ll | ||
| undef.ll | ||
| used.ll | ||
| verify-invalid.ll | ||
| weak-undefined.ll | ||
| weak.ll | ||