If you allocate 16 megabytes, Komodo will only use 12, and not use any more until you set it to 24, and so on with each doubling. Please note Komodo’s hash entry size is a bit different from other programs. The Windows 32 bit version limits this to 2048 megabytes due to hardware and operating system limitations. All 64 bit versions allow up to 65536 megabytes (64 GB) to be allocated, assuming your system has that much. See the document setHASH.txt for more specific information on how this should be set for ultimate performance. It is usually safe, but may not be optimum, to use half of your available memory for Hash, but smaller Hash size will improve performance slightly in fast play. The default is set to 128 (in megabytes) which is probably enough for rapid use but should be set higher for longer think times or four or more cores. This defines the maximum amount of memory to use for the transposition table - a major factor in the performance of modern chess programs.
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