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Retire cpu_count()

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Set threads number always to 1 at startup and let the
user explicitly to chose the number of threads.

Also preserve the useful behavior of automatically set
"Min Split Depth" according to the requested threads,
indeed this parameter is too technical for a casual user,
so, when left to zero, we set it on a sensible value.

No functional change
This commit is contained in:
Joona Kiiski
2013-08-01 22:12:58 +01:00
committed by Marco Costalba
parent 408e6ee9b6
commit a16ba5bbd1
5 changed files with 10 additions and 39 deletions
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11
src/ucioption.cpp
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@@ -51,14 +51,9 @@ bool CaseInsensitiveLess::operator() (const string& s1, const string& s2) const
/// 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");
@@ -74,9 +69,9 @@ void init(OptionsMap& o) {
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);