From: Rodrigo Exterckötter Tjäder <rodrigo@tjader.xyz>
Date: Mon, 14 May 2018 17:52:21 +0000 (-0300)
Subject: Use threads to clear the TT faster.
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;ds=sidebyside;h=626d43a329adca379421db5d378e33df0868584b;hp=626d43a329adca379421db5d378e33df0868584b;p=stockfish

Use threads to clear the TT faster.

Stockfish currently takes a while to clear the TT when using larger hash sizes.

On one machine with 128 GB hash it takes about 50 seconds with a single thread,
allowing it to use all allocated cores brought that time down to 4 seconds on
some Linux systems. The patch was further tested on Windows and refined with
NUMA binding of the hash initializing threads (we refer to pull request #1601
for the complete discussion and the speed measurements).

Closes https://github.com/official-stockfish/Stockfish/pull/1601

No functional change
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