#1) I have Windows 7 Home Premium 64-bit OS and am unable to complete the instructions for enabling "Large pages" because I don't have access to the "Local Group Policy Editor". Supposedly if I upgrade to Windows 7 Professional($69) or Windows 7 Ultimate($120) I will be able to use the group policy editor and therefore enable the use of "Large Pages". My question is before I spend $69 on an OS upgrade is there any possible way of using "Large pages'' without "Locking pages in memory"? Obviously this is a "WTF" question since "Large pages" was called a "new feature" during the beta-testing causing some to be more interested in buying Rybka 4(because of the so called 15% speed-up that was advertised).
#2) I decided to test out the new Rybka 4 by using it for analysis in some of my current correspondence games. Over the last two days I have been encountering a very annoying habit that Rybka 4 shares with Rybka 3(but worse). When I run infinite analysis the engine zips to a certain depth like 18-20 then stalls for hours on end before advancing to the next depth. This bad habit happens when I use the default settings and when I enable "Always score main move" and "Display upperbounds". It makes Rybka 4 almost impossible to use for analysis because it stalls at depth 18 whereas Stockfish or something better gets to depth 30 by the time Rybka 4 goes from 18-19. I guess this really isn't a question but a big "gripe/complaint".
Because of these two problems that I have encountered so far I would advise nobody who uses Windows 7 Home Premium/Starter 64bit to buy this engine if you plan to use it for deep analysis/correspondence chess until the problem is solved. For use on playchess playing blitz games and making "playchess" books this engine's 60-80 elo improvement is probably worth the money it costs.
#2) If you use sampled search, you will see what it is stalling on and you can check it out manually. Not a complete solution for sure, but better than just staring at the screen.
I begin to analyze a position with infinite analysis, I move up and down the lines while also switching from single to multi-pv. When I return to the root position the engine acts like it never did any of the work I just put it through and starts from scratch until about depth 18 and then it locks up and the kn/s count starts rising infinitely. The kn/s are normally about 350-400kn/s in the average middlegame and after about 2 hours of stalling on the same move the reported kn/s has risen to over 900. If I hit the stop button and then the go button the engine spits out a different line at a much higher depth but then stalls on that too. This is really weird stuff....
Windows 7 Pro x64
Intel I7-920 quad with 6gb RAM
Chessbase 12 GUI
Deep Rybka 4 SSE42 x64 with default options
> When Rybka 4 starts to suggest Bc5 make it look at Ka8
I've had it running now on this position over 3.5 hours. I'm using Aquarium 4. There seems to be no movement for over 2 hours and I haven't got past Bd6. Kn/s are frozen. Weird!
I have an HP quadcore AMD Phenom X4 9750 system.Came with Windows Vista Home premium 64 bit which I still use with Ryb3 and have no problems(that I can observe anyway).I use IA as well as play coresp games using time settings.
Bob,can I expect some kind of problems like you have encountered if/when I purchase and start using Ryb4?Must I also fool around with this page stuff you are writing about?I have no idea about these page problems being a novice.Perhaps it will not be necessary to do anything with my setup?Yes,no?
so maybe all that sounds painful, but consider this -- i hadn't done the maths, but while 15% doesn't sound like much at all, kullberg pointed out it's like overclocking a 3ghz chip to 3.45 ghz. since i have a 3ghz computer & i've never messed about w/ overclocking that sounded pretty cool to me...all in all i've come pretty much all the way round to large pages within 24 hours. not a huge deal, i agree, but since it's there you might as well get the most of it if you can.
> .If I do nothing,will I have a problem of anykind with this new Ryb4,i'm wondering?
No problem at all. I haven't tried it as well. I wonder if I will ever try it. :)
Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz, EM64T Family 6 Model 23 Stepping 7, GenuineIntel, level 6, revision 0x1707
4094 mb RAM, 1642 mb available, page size = 4096
Windows Server '03 x64
Process priority: NORMAL_PRIORITY_CLASS
Hash size set to 2048 mb
Nalimov path set to C:\autoTB\TB4;C:\autoTB\TB5;C:\autoTB\TB6
Nalimov usage set to never
Child Process Priority set to Normal
Always Score Main Move set to true
Use Large Pages set to true
Using large pages.
The key is to generate a copy of the engine with large pages set, so that you don't have to unload it and turn on hard pages and reload it. You also need to make sure that you don't have lots of other things running on your computer (look at task manager for this). If you do these two things, you should have enough non-fragmented space to put a 2GB hash into 4GB of memory, like I did a couple of minutes ago.
> Nalimov usage set to never
Thanks for posting your log and setup :)
If you enable Nalimov usage can you still get the Large Page option to work ?
How many gb of 6man Nalimov are in your config ?
> Alan, I'm looking for the best windows version for 64bit. I'm up grading from a full windows 98 disc, upgraded to Windows xp 32 bit , so I'm out of the loop for an upgrade to Windows 7. I thought Windows Xp pro had some unresolved security issues, or is it Window 7 Ultimate's xp mode that has the problem?
Ok, I'm not Alan, but jus go for Windows 7 Robert, it is quite good.
> I wonder if any of my old software from ChessOkey-dokey will still work? I'll find out!!!
I won't guarantee that :). Maybe it will run in the XP mode (which I don't like much :)).
> What about this issue with "large Pages"? Are you experiencing any problems with that?
I haven't tried that yet, I've got Large Pageophobia :)
> Because of these two problems that I have encountered so far I would advise nobody who uses Windows 7 Home Premium/Starter 64bit to buy this engine if you plan to use it for deep analysis/correspondence chess
The first problem costs only about 15 elo, so I don't think the disadvantage is that big (e.g. if Vas didn't add the feature, would you also be giving advice about not buying the engine?)
As for the second problem, just, force the move, let it reach a relative higher depth, and come back to the root, new amazing hash management should make Rybka reach the new depth in minutes instead of hours.
Bobby C (CB11 GUI)
bnc (CB12 GUI)
yanquis1972 (CB10 GUI)
I am starting to think it is a problem with multi-pv because I don't get any stalls at all until I start switching between pv's. I am also starting to think this is a CB GUI problem only but I am having a friend test this on some other GUI's that I don't have.
and i get to depth 21 when on pv 1 quite easy then tried pv 2 and it slowly went back up , starting 15 or 16 ....
then back to 1pv again , and I got to 19 in 45 sec then took 3.5min to reach d20 so I don't know if this is long or not ? maybe that is a normal value ?
then after that almost 7 minutes to go from d20 to 21 ... so no idea if this is normal or if in your case it takes much longer?
Core I5 750 Quad 2.67Ghz
Powered by mwForum 2.27.4 © 1999-2012 Markus Wichitill