Once I have done the OS changes required for Large Pages, can I undo the settings if I want to?
>Does the Large Page settings effect any other applications in a bad way?
>Once I have done the OS changes required for Large Pages, can I undo the settings if I want to?
Yes, it's simple
> Usually not
What do you mean? Do you have experiences of when this is not good?
I need doc for the SSE42 version. What does it mean "SSE"? How to install it? (I found nothing about it.)
The normal move time controls how long Rybka thinks in the average position. Lower values mean faster play. The exact mechanism is very specific to the type of time control.
The max move time controls how long Rybka thinks in critical positions.
If I remember in R3 recommended setting 50, how about in R4
> MultiPV_cp default 20000?
Avoids overflow on some GUI's, and 20000 is just about enough.
> If I remember in R3 recommended setting 50
It should be about the same for R4, but the 20000 setting is good enough.
1) Does Rybka use the usual "Affinity Mask" trick of allocating every other processor (assuming that one only specifies half the cpus to use) or
2) Does Rybka even use HT to its advantage and intelligently distributes smaller loads to HT cores
3) Or is everything as with Rybka 3 - e.g. its best to turn off HT in Bios or set the Affinity Mask every time by hand....
About Large Pages:
How much memory does one need to consistently and safely allocate 2 GB for Hash? Is it 6GB or better 12GB?
>How much memory does one need to consistently and safely allocate 2 GB for Hash? Is it 6GB or better 12GB?
Depends on the number of cores and tablebases you've got. On my 12 GB 12 core computers (117 GB of tablebases) I only get one or two engine starts with large pages. On my 32 GB 8 cores computer I get very many - in fact it never failed so far.
If I purchase the multi-processor Rybka (aka Deep Rybka), does it work on a single processor computer or (shudders) must I purchase both versions ?
With Deep Rybka 3 on, nothing else running, I have 4 processes (one per core) with a constant 100% CPU Usage.
With Deep Rybka 4 on, nothing else running, I have 4 processes (one per core) with an avarage 40% CPU Usage, and a 5% - 70% interval.
Any idea ?
Main Process Priority: Normal
Child Process Priority: Normal
To see if it helps.
By the way, my Rybka 3 is still 100% even with priority "low" for all processes, since there is nothing else running.
If I use Deep Rybka 4, then some other engine, then Rybka 4 again, it can't get to 100% CPU usage.
Probably Rybka 4 leaves some garbage around, with Windows 7, when you quit it.
Have you seen an explanation of the various engine parameters or is that yet to come from Vas?
For instance, why do you think your Process Priority choices might work better than the defaults?
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