An Old Engine

[Ras]

Just checked with the modern build - the hash size behaves normally in the task manager with 2048 MB. However, I don't have EGTBs.

[MikeB]

Often when I set a hash size on a low value (2048 MB or 1024 MB), the memory used reported by the Taskmanager is very low (10 MB to 15 MB).

Does this persist when running e.g. analysis for a few seconds after changing the hash size? Or does the usage go up?

On Windows 10 Pro , do not use use Task Manager, use Resource Monitor ,a much better and more precise tool by Microsoft.

The proof of the pudding is to set hash to 2048 and run it single core to depth 30 ( go depth 30) shown below:

Houdini 6.03:

Code: Select all

Houdini 6 Pro x64-popc
(c) 2017 Robert Houdart
...
info string 128 MB Large Page Hash
set hash 2048
info string 2048 MB Large Page Hash
go depth 30

first pv with 100% hash full
info multipv 1 depth 30 seldepth 58 score cp 15 time 480407 nodes 1251101384 nps 2604000 tbhits 0 hashfull 1000 pv d2d4 d7d5 c2c4 e7e6 g1f3 d5c4 e2e3 a7a6 f1c4 g8f6 e1g1 c7c5 d4c5 d8d1 f1d1 f8c5 b1d2 b8d7 c4e2 b7b6 a2a3 c8b7 b2b4 c5e7 c1b2 a8c8 d2c4 b7d5 a1c1 e8g8 c4e5 d7e5 f3e5 b6b5 b2d4 f8d8
info currmove e2e4 currmovenumber 2
...
info multipv 1 depth 30 seldepth 58 score cp 19 time 516535 nodes 1348071986 nps 2609000 tbhits 0 hashfull 1000 pv e2e4 e7e6 d2d4 d7d5 b1c3 f8b4 e4d5 e6d5 f1d3 g8f6 g1e2 e8g8 e1g1 b4d6 a2a3 c7c6 c1f4 b8a6 d1d2 a6c7 a1e1 g7g6 f4d6 d8d6 d2g5 g8g7 e2f4 c7e6 f4e6 c8e6 c3e2 a8e8 e2f4
bestmove e2e4 ponder e7e6

Houdidit (version prior to the node count fix):

Code: Select all

Houdidit 6.03 Pro x64-popc
Stockfish Developers & Robert Houdart
...
info string 128 MB Large Page Hash
set hash 2048
info string 2048 MB Large Page Hash
go depth 30
...
first pv with 100% hash full
info multipv 1 depth 30 seldepth 58 score cp 15 time 485255 nodes 1251101384 nps 2578000 tbhits 0 hashfull 1000 pv d2d4 d7d5 c2c4 e7e6 g1f3 d5c4 e2e3 a7a6 f1c4 g8f6 e1g1 c7c5 d4c5 d8d1 f1d1 f8c5 b1d2 b8d7 c4e2 b7b6 a2a3 c8b7 b2b4 c5e7 c1b2 a8c8 d2c4 b7d5 a1c1 e8g8 c4e5 d7e5 f3e5 b6b5 b2d4 f8d8
...
info multipv 1 depth 30 seldepth 58 score cp 19 time 522818 nodes 1348071986 nps 2578000 tbhits 0 hashfull 1000 pv e2e4 e7e6 d2d4 d7d5 b1c3 f8b4 e4d5 e6d5 f1d3 g8f6 g1e2 e8g8 e1g1 b4d6 a2a3 c7c6 c1f4 b8a6 d1d2 a6c7 a1e1 g7g6 f4d6 d8d6 d2g5 g8g7 e2f4 c7e6 f4e6 c8e6 c3e2 a8e8 e2f4
bestmove e2e4 ponder e7e6

[Vinvin]

Thanks, Mike !