Hello
How do I know if Houdini 6 Pro uses my large pages?
rgds
Houdini 6 Pro and large pages
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Re: Houdini 6 Pro and large pages
Houdini will send the message "info string XXX Large Page Hash".
You can also see it in the Task Manager, the Large Page memory is only visible as a Virtual Memory allocation (if I recall correctly).
Finally, you can try the "lp" command (after double-clicking on "Houdini 6.exe"). Houdini will try to create large page memory blocks of increasing size and shows a summary of the results.
You can also see it in the Task Manager, the Large Page memory is only visible as a Virtual Memory allocation (if I recall correctly).
Finally, you can try the "lp" command (after double-clicking on "Houdini 6.exe"). Houdini will try to create large page memory blocks of increasing size and shows a summary of the results.
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Re: Houdini 6 Pro and large pages
Thanks.
But is there a option to tick in the engine menu?
But is there a option to tick in the engine menu?
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Re: Houdini 6 Pro and large pages
No, if Large Pages are available in Windows, Houdini 6 Pro will try to use them.
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Re: Houdini 6 Pro and large pages
Not trying to hijack the thread, but is that also true of NUMA? So if H6 Pro is on a single CPU machine, there's no need to turn off NUMA? Is it automatic in its setting etc?
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Re: Houdini 6 Pro and large pages
Correct, there is no need to turn off NUMA if you're running on a system with only a single NUMA node.
The NUMA support will only make a difference if Houdini detects at least 2 NUMA nodes (as reported by the appropriate Windows function).
The NUMA support will only make a difference if Houdini detects at least 2 NUMA nodes (as reported by the appropriate Windows function).
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Re: Houdini 6 Pro and large pages
How much stronger is Houdini with Numa and LP ?Houdini wrote:Correct, there is no need to turn off NUMA if you're running on a system with only a single NUMA node.
The NUMA support will only make a difference if Houdini detects at least 2 NUMA nodes (as reported by the appropriate Windows function).
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Re: Houdini 6 Pro and large pages
These sorts of things won't have simple answers.CheckersGuy wrote:How much stronger is Houdini with Numa and LP ?Houdini wrote:Correct, there is no need to turn off NUMA if you're running on a system with only a single NUMA node.
The NUMA support will only make a difference if Houdini detects at least 2 NUMA nodes (as reported by the appropriate Windows function).
I have a very old machine with NUMA, which won't be manged by the OS as well as new machines with NUMA.
Programs definitely need to be NUMA aware (see Ipman's tests).
LP makes things a few percent faster but it's not a big win. On the other hand, faster is faster. So why not?
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Re: Houdini 6 Pro and large pages
It highly depends on the hardware, and in case of Large Pages, on the hash size used. Bigger hashes will benefit more from Large Pages.CheckersGuy wrote:How much stronger is Houdini with Numa and LP ?Houdini wrote:Correct, there is no need to turn off NUMA if you're running on a system with only a single NUMA node.
The NUMA support will only make a difference if Houdini detects at least 2 NUMA nodes (as reported by the appropriate Windows function).
You can find some real performance data for two systems (40-core dual Intel Xeon v4 and 24-core dual AMD Opteron 6174) in the User's Manual, see here: http://www.cruxis.com/chess/manual/houd ... ersion.htm
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Re: Houdini 6 Pro and large pages
The 40-thread benchmark with numa is pretty impressive. Didn´t expect such a big difference.Houdini wrote:It highly depends on the hardware, and in case of Large Pages, on the hash size used. Bigger hashes will benefit more from Large Pages.CheckersGuy wrote:How much stronger is Houdini with Numa and LP ?Houdini wrote:Correct, there is no need to turn off NUMA if you're running on a system with only a single NUMA node.
The NUMA support will only make a difference if Houdini detects at least 2 NUMA nodes (as reported by the appropriate Windows function).
You can find some real performance data for two systems (40-core dual Intel Xeon v4 and 24-core dual AMD Opteron 6174) in the User's Manual, see here: http://www.cruxis.com/chess/manual/houd ... ersion.htm