If you're simultaneously running multiple Houdini Pro instances they will by default compete for the resources on the same NUMA nodes. The speed gain depends on the number of cores, the motherboard and CPU brand. Houdini Pro detects the NUMA configuration at start-up and will adapt its memory management and thread interaction based on the different NUMA nodes that are available. Most CPU mother boards with multiple sockets employ the so-called "NUMA" architecture. Houdini will try to create large page memory blocks of increasing size and show a summary of the results. ![]() Run Houdini in a command window (simply by double-clicking on the executable) and type lp followed by Enter. You can test the availability of Large Pages with the lp command. ![]() After a while the Windows memory becomes too fragmented for large page allocation, and Houdini will fall back to standard memory page usage. Very often large memory pages will only be available shortly after booting Windows. IMPORTANT: You'll also need to run your chess GUI with administrative rights (" Run as Administrator") or disable UAC in Windows. ![]() You may have to logoff or reboot for the change to take effect.
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