Use huge pages for worker data

KierenP · vondele · commit 75edbee01e6f · 2025-10-14T17:46:13.000+02:00
As the worker data is quite large (28MB after #6350) we can make use of huge pages as a speedup. prior to #6350 STC passed elo gaining bounds: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 166272 W: 43479 L: 42993 D: 79800 Ptnml(0-2): 540, 17598, 46365, 18102, 531 https://tests.stockfishchess.org/tests/view/68e9f3c0d323fd15c04e3ba4 Tested the speedup on a large machine with speedtest: ==== master ==== Average (over 20): 288644510 ==== largePageWorker ==== Average (over 20): 292082422 Test after #6350: ==== rustam-cpp-testPR ==== Average (over 20): 291035351 ==== rustam-cpp-testPR-pages ==== Average (over 20): 291937367 #6359 No functional change
diff --git a/AUTHORS b/AUTHORS
@@ -136,6 +136,7 @@ Ken Takusagawa
 Kenneth Lee (kennethlee33)
 kevlu8
 Kian E (KJE-98)
+Kieren Pearson (KierenP)
 kinderchocolate
 Kiran Panditrao (Krgp)
 Kirill Zaripov (kokodio)
diff --git a/src/thread.cpp b/src/thread.cpp
@@ -26,6 +26,7 @@
 #include <unordered_map>
 #include <utility>
 
+#include "memory.h"
 #include "movegen.h"
 #include "search.h"
 #include "syzygy/tbprobe.h"
@@ -53,8 +54,8 @@ Thread::Thread(Search::SharedState&                    sharedState,
         // the Worker allocation. Ideally we would also allocate the SearchManager
         // here, but that's minor.
         this->numaAccessToken = binder();
-        this->worker =
-          std::make_unique<Search::Worker>(sharedState, std::move(sm), n, this->numaAccessToken);
+        this->worker = make_unique_large_page<Search::Worker>(sharedState, std::move(sm), n,
+                                                              this->numaAccessToken);
     });
 
     wait_for_search_finished();
diff --git a/src/thread.h b/src/thread.h
@@ -28,6 +28,7 @@
 #include <mutex>
 #include <vector>
 
+#include "memory.h"
 #include "numa.h"
 #include "position.h"
 #include "search.h"
@@ -93,8 +94,8 @@ class Thread {
     void   wait_for_search_finished();
     size_t id() const { return idx; }
 
-    std::unique_ptr<Search::Worker> worker;
-    std::function<void()>           jobFunc;
+    LargePagePtr<Search::Worker> worker;
+    std::function<void()>        jobFunc;
 
    private:
     std::mutex                mutex;
