1 files changed, 13 insertions, 0 deletions
diff --git a/src/node/chainstatemanager_args.cpp b/src/node/chainstatemanager_args.cpp
index 87d9238c18..e61deca3ec 100644
--- a/src/node/chainstatemanager_args.cpp
+++ b/src/node/chainstatemanager_args.cpp
@@ -6,7 +6,9 @@
 
 #include <arith_uint256.h>
 #include <common/args.h>
+#include <common/system.h>
 #include <kernel/chainstatemanager_opts.h>
+#include <logging.h>
 #include <node/coins_view_args.h>
 #include <node/database_args.h>
 #include <tinyformat.h>
@@ -16,6 +18,7 @@
 #include <util/translation.h>
 #include <validation.h>
 
+#include <algorithm>
 #include <chrono>
 #include <string>
 
@@ -41,6 +44,16 @@ util::Result<void> ApplyArgsManOptions(const ArgsManager& args, ChainstateManage
     ReadDatabaseArgs(args, opts.coins_db);
     ReadCoinsViewArgs(args, opts.coins_view);
 
+    int script_threads = args.GetIntArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
+    if (script_threads <= 0) {
+        // -par=0 means autodetect (number of cores - 1 script threads)
+        // -par=-n means "leave n cores free" (number of cores - n - 1 script threads)
+        script_threads += GetNumCores();
+    }
+    // Subtract 1 because the main thread counts towards the par threads.
+    opts.worker_threads_num = std::clamp(script_threads - 1, 0, MAX_SCRIPTCHECK_THREADS);
+    LogPrintf("Script verification uses %d additional threads\n", opts.worker_threads_num);
+
     return {};
 }
 } // namespace node