#include "misc.h"
#include "thread.h"
-#ifdef __hpux
-# include <sys/pstat.h>
-#endif
-
using namespace std;
/// Version number. If Version is left empty, then compile date, in the
void start_logger(bool b) { Logger::start(b); }
-/// cpu_count() tries to detect the number of CPU cores
-
-int cpu_count() {
-
-#ifdef _WIN32
- SYSTEM_INFO s;
- GetSystemInfo(&s);
- return s.dwNumberOfProcessors;
-#else
-
-# if defined(_SC_NPROCESSORS_ONLN)
- return sysconf(_SC_NPROCESSORS_ONLN);
-# elif defined(__hpux)
- struct pst_dynamic psd;
- if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
- return 1;
- return psd.psd_proc_cnt;
-# else
- return 1;
-# endif
-
-#endif
-}
-
-
/// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
/// conversion from milliseconds to struct timespec, as used by pthreads.
assert(requested > 0);
+ // Value 0 has a special meaning: We determine the optimal minimum split depth
+ // automatically. Anyhow the minimumSplitDepth should never be under 4 plies.
+ if (!minimumSplitDepth)
+ minimumSplitDepth = (requested < 8 ? 4 : 7) * ONE_PLY;
+ else
+ minimumSplitDepth = std::max(4 * ONE_PLY, minimumSplitDepth);
+
while (size() < requested)
push_back(new_thread<Thread>());
/// init() initializes the UCI options to their hard coded default values
-/// and initializes the default value of "Threads" and "Min Split Depth"
-/// parameters according to the number of CPU cores detected.
void init(OptionsMap& o) {
- int cpus = std::min(cpu_count(), MAX_THREADS);
- int msd = cpus < 8 ? 4 : 7;
-
o["Write Debug Log"] = Option(false, on_logger);
o["Write Search Log"] = Option(false);
o["Search Log Filename"] = Option("SearchLog.txt");
o["Space"] = Option(100, 0, 200, on_eval);
o["Aggressiveness"] = Option(100, 0, 200, on_eval);
o["Cowardice"] = Option(100, 0, 200, on_eval);
- o["Min Split Depth"] = Option(msd, 4, 12, on_threads);
- o["Max Threads per Split Point"] = Option(5, 4, 8, on_threads);
- o["Threads"] = Option(cpus, 1, MAX_THREADS, on_threads);
+ o["Min Split Depth"] = Option(0, 0, 12, on_threads);
+ o["Max Threads per Split Point"] = Option(5, 4, 8, on_threads);
+ o["Threads"] = Option(1, 1, MAX_THREADS, on_threads);
o["Idle Threads Sleep"] = Option(true);
o["Hash"] = Option(32, 1, 8192, on_hash_size);
o["Clear Hash"] = Option(on_clear_hash);