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Optimal tune for 8 cores

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After deep tests Louis Zulli found on his OCTAL machine that
best setup for an 8 core CPU is as following

"Threads" = 8
"Minimum Split Depth" = 6 or 7 (mSD)
"Maximum Number of Threads per Split Point" = not important (MNTpSP)

Here are testing results:

mSD7 (8 threads) vs mSD4 (8 threads): 291 - 120 - 589
mSD6 vs mSD7: 168 - 188 - 644
mSD6-MNTpSP5 vs mSD6-MNTpSP6: 172 - 172 - 656
SF-7threads vs SF-8threads: 179 - 204 - 617

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-01-08 12:51:11 +01:00
parent 5b21c10afb
commit 6a6facc058
1 changed files with 6 additions and 7 deletions
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13
src/ucioption.cpp
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@ -196,15 +196,14 @@ void init_uci_options() {
load_defaults(options);
// Limit the default value of "Threads" to 7 even if we have 8 CPU cores.
// According to Ken Dail's tests, Glaurung plays much better with 7 than
// with 8 threads. This is weird, but it is probably difficult to find out
// why before I have a 8-core computer to experiment with myself.
assert(options.find("Threads") != options.end());
// Set optimal value for parameter "Minimum Split Depth"
// according to number of available cores.
assert(options.find("Minimum Split Depth") != options.end());
options["Threads"].defaultValue = stringify(Min(cpu_count(), 7));
options["Threads"].currentValue = stringify(Min(cpu_count(), 7));
Option& msd = options["Minimum Split Depth"];
if (cpu_count() >= 8)
msd.defaultValue = msd.currentValue = stringify(7);
}