/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, 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
# include <sys/time.h>
# include <sys/types.h>
# include <unistd.h>
+# if defined(__hpux)
+# include <sys/pstat.h>
+# endif
#else
#include <cassert>
#include <cstdio>
+#include <cstring>
#include <iomanip>
#include <iostream>
#include <sstream>
/// Version number. If this is left empty, the current date (in the format
/// YYMMDD) is used as a version number.
-static const string EngineVersion = "1.6.1";
+static const string EngineVersion = "1.7";
static const string AppName = "Stockfish";
static const string AppTag = "";
}
-/// cpu_count() tries to detect the number of CPU cores.
+/// builtin_cpu_count() tries to detect the number of CPU cores, if
+/// hyper-threading is enabled this is the number of logical processors.
#if !defined(_MSC_VER)
# if defined(_SC_NPROCESSORS_ONLN)
-int cpu_count() {
+static int builtin_cpu_count() {
return Min(sysconf(_SC_NPROCESSORS_ONLN), 8);
}
+# elif defined(__hpux)
+static int builtin_cpu_count() {
+ struct pst_dynamic psd;
+ if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
+ return 1;
+
+ return Min(psd.psd_proc_cnt, 8);
+}
# else
-int cpu_count() {
+static int builtin_cpu_count() {
return 1;
}
# endif
#else
-int cpu_count() {
+static int builtin_cpu_count() {
SYSTEM_INFO s;
GetSystemInfo(&s);
return Min(s.dwNumberOfProcessors, 8);
#endif
+/// HT_enabled() returns true if hyper-threading is enabled on current machine
+
+static bool HT_enabled() {
+
+ char CPUString[0x20];
+ int CPUInfo[4] = {-1};
+ int nIds, nLogicalCPU, nCores;
+
+ // Detect CPU producer
+ __cpuid(CPUInfo, 0);
+ nIds = CPUInfo[0];
+
+ memset(CPUString, 0, sizeof(CPUString));
+ memcpy(&CPUString[0], &CPUInfo[1], sizeof(int));
+ memcpy(&CPUString[4], &CPUInfo[3], sizeof(int));
+ memcpy(&CPUString[8], &CPUInfo[2], sizeof(int));
+
+ // Not an Intel CPU or CPUID.4 not supported
+ if (strcmp(CPUString, "GenuineIntel") || nIds < 4)
+ return false;
+
+ // Detect if HT Technology is supported
+ __cpuid(CPUInfo, 1);
+ if (!((CPUInfo[3] >> 28) & 1))
+ return false;
+
+ nLogicalCPU = (CPUInfo[1] >> 16) & 0xFF;
+
+ // Detect number of cores
+ __cpuid(CPUInfo, 4);
+ nCores = 1 + ((CPUInfo[0] >> 26) & 0x3F);
+
+ return nLogicalCPU > nCores;
+}
+
+
+/// cpu_count() tries to detect the number of physical CPU cores taking
+/// in account hyper-threading.
+
+int cpu_count() {
+
+ return HT_enabled() ? builtin_cpu_count() / 2 : builtin_cpu_count();
+}
+
+
/*
From Beowulf, from Olithink
*/