WebSVN – Games.Chess Giants – Diff – /engine-stockfish/misc.cpp

   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
   GNU General Public License for more details.
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+#ifdef _WIN32
+#if _WIN32_WINNT < 0x0601
+#undef  _WIN32_WINNT
+#define _WIN32_WINNT 0x0601 // Force to include needed API prototypes
+#endif
+#include <windows.h>
+// The needed Windows API for processor groups could be missed from old Windows
+// versions, so instead of calling them directly (forcing the linker to resolve
+// the calls at compile time), try to load them at runtime. To do this we need
+// first to define the corresponding function pointers.
+extern "C" {
+typedef bool(*fun1_t)(LOGICAL_PROCESSOR_RELATIONSHIP,
+                      PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX, PDWORD);
+typedef bool(*fun2_t)(USHORT, PGROUP_AFFINITY);
+typedef bool(*fun3_t)(HANDLE, CONST GROUP_AFFINITY*, PGROUP_AFFINITY);
+}
+#endif
 #include <fstream>
 #include <iomanip>
 #include <iostream>
 #include <sstream>
+#include <vector>
 #include "misc.h"
 #include "thread.h"
 using namespace std;
 namespace {
 /// Version number. If Version is left empty, then compile date in the format
 /// DD-MM-YY and show in engine_info.
-const string Version = "8";
+const string Version = "9";
 /// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
 /// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
 /// can toggle the logging of std::cout and std:cin at runtime whilst preserving
 /// usual I/O functionality, all without changing a single line of code!
 /// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
 struct Tie: public streambuf { // MSVC requires split streambuf for cin and cout
   Tie(streambuf* b, streambuf* l) : buf(b), logBuf(l) {}
-  int sync() { return logBuf->pubsync(), buf->pubsync(); }
+  int sync() override { return logBuf->pubsync(), buf->pubsync(); }
-  int overflow(int c) { return log(buf->sputc((char)c), "<< "); }
+  int overflow(int c) override { return log(buf->sputc((char)c), "<< "); }
-  int underflow() { return buf->sgetc(); }
+  int underflow() override { return buf->sgetc(); }
-  int uflow() { return log(buf->sbumpc(), ">> "); }
+  int uflow() override { return log(buf->sbumpc(), ">> "); }
   streambuf *buf, *logBuf;
   int log(int c, const char* prefix) {
     static int last = '\n'; // Single log file
     if (last == '\n')
         logBuf->sputn(prefix, 3);
     return last = logBuf->sputc((char)c);
   }
 };
 class Logger {
   Logger() : in(cin.rdbuf(), file.rdbuf()), out(cout.rdbuf(), file.rdbuf()) {}
  ~Logger() { start(""); }
   ofstream file;
   Tie in, out;
 /// prefetch() preloads the given address in L1/L2 cache. This is a non-blocking
 /// function that doesn't stall the CPU waiting for data to be loaded from memory,
 /// which can be quite slow.
 #ifdef NO_PREFETCH
 void prefetch(void*) {}
 #else
 void prefetch(void* addr) {
 #  if defined(__INTEL_COMPILER)
    // This hack prevents prefetches from being optimized away by
    // Intel compiler. Both MSVC and gcc seem not be affected by this.
    __asm__ ("");
 #  endif
   __builtin_prefetch(addr);
 #  endif
+}
 #endif
+void prefetch2(void* addr) {
+  prefetch(addr);
+  prefetch((uint8_t*)addr + 64);
+}
+namespace WinProcGroup {
+#ifndef _WIN32
+void bindThisThread(size_t) {}
+#else
+/// get_group() retrieves logical processor information using Windows specific
+/// API and returns the best group id for the thread with index idx. Original
+/// code from Texel by Peter Österlund.
+int get_group(size_t idx) {
+  int threads = 0;
+  int nodes = 0;
+  int cores = 0;
+  DWORD returnLength = 0;
+  DWORD byteOffset = 0;
+  // Early exit if the needed API is not available at runtime
+  HMODULE k32 = GetModuleHandle("Kernel32.dll");
+  auto fun1 = (fun1_t)GetProcAddress(k32, "GetLogicalProcessorInformationEx");
+  if (!fun1)
+      return -1;
+  // First call to get returnLength. We expect it to fail due to null buffer
+  if (fun1(RelationAll, nullptr, &returnLength))
+      return -1;
+  // Once we know returnLength, allocate the buffer
+  SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *buffer, *ptr;
+  ptr = buffer = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX*)malloc(returnLength);
+  // Second call, now we expect to succeed
+  if (!fun1(RelationAll, buffer, &returnLength))
+  {
+      free(buffer);
+      return -1;
+  }
+  while (ptr->Size > 0 && byteOffset + ptr->Size <= returnLength)
+  {
+      if (ptr->Relationship == RelationNumaNode)
+          nodes++;
+      else if (ptr->Relationship == RelationProcessorCore)
+      {
+          cores++;
+          threads += (ptr->Processor.Flags == LTP_PC_SMT) ? 2 : 1;
+      }
+      byteOffset += ptr->Size;
+      ptr = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX*)(((char*)ptr) + ptr->Size);
+  }
+  free(buffer);
+  std::vector<int> groups;
+  // Run as many threads as possible on the same node until core limit is
+  // reached, then move on filling the next node.
+  for (int n = 0; n < nodes; n++)
+      for (int i = 0; i < cores / nodes; i++)
+          groups.push_back(n);
+  // In case a core has more than one logical processor (we assume 2) and we
+  // have still threads to allocate, then spread them evenly across available
+  // nodes.
+  for (int t = 0; t < threads - cores; t++)
+      groups.push_back(t % nodes);
+  // If we still have more threads than the total number of logical processors
+  // then return -1 and let the OS to decide what to do.
+  return idx < groups.size() ? groups[idx] : -1;
+}
+/// bindThisThread() set the group affinity of the current thread
+void bindThisThread(size_t idx) {
+  // Use only local variables to be thread-safe
+  int group = get_group(idx);
+  if (group == -1)
+      return;
+  // Early exit if the needed API are not available at runtime
+  HMODULE k32 = GetModuleHandle("Kernel32.dll");
+  auto fun2 = (fun2_t)GetProcAddress(k32, "GetNumaNodeProcessorMaskEx");
+  auto fun3 = (fun3_t)GetProcAddress(k32, "SetThreadGroupAffinity");
+  if (!fun2 || !fun3)
+      return;
+  GROUP_AFFINITY affinity;
+  if (fun2(group, &affinity))
+      fun3(GetCurrentThread(), &affinity, nullptr);
+}
+#endif
+} // namespace WinProcGroup

Subversion Repositories Games.Chess Giants

Games.Chess Giants/engine-stockfish/misc.cpp – Rev 154 → 169