diff options
| -rw-r--r-- | lld/ELF/Driver.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp index c540f573aaef..79f16a281df9 100644 --- a/lld/ELF/Driver.cpp +++ b/lld/ELF/Driver.cpp @@ -1421,7 +1421,9 @@ static void readConfigs(opt::InputArgList &args) { } // --threads= takes a positive integer and provides the default value for - // --thinlto-jobs=. + // --thinlto-jobs=. If unspecified, cap the number of threads since + // overhead outweighs optimization for used parallel algorithms for the + // non-LTO parts. if (auto *arg = args.getLastArg(OPT_threads)) { StringRef v(arg->getValue()); unsigned threads = 0; @@ -1430,6 +1432,9 @@ static void readConfigs(opt::InputArgList &args) { arg->getValue() + "'"); parallel::strategy = hardware_concurrency(threads); config->thinLTOJobs = v; + } else if (parallel::strategy.compute_thread_count() > 16) { + log("set maximum concurrency to 16, specify --threads= to change"); + parallel::strategy = hardware_concurrency(16); } if (auto *arg = args.getLastArg(OPT_thinlto_jobs_eq)) config->thinLTOJobs = arg->getValue(); |