Author: Slater Wold
Date: 03:54:42 12/01/01
Go up one level in this thread
On November 30, 2001 at 23:32:40, Robert Hyatt wrote: >On November 30, 2001 at 12:18:20, Slater Wold wrote: > >>On November 30, 2001 at 11:59:01, Robert Hyatt wrote: >> >>>On November 30, 2001 at 02:31:18, Slater Wold wrote: >>> >>>>On November 29, 2001 at 21:21:33, K. Burcham wrote: >>>> >>>>> >>>>> >>>>>Mr Hyatt. i have read the posts here about deep fritz and its kns increase with >>>>>two processors. >>>>> >>>>>from the info i have seen with my dual machine, i have become curious about >>>>>something. below are the examples with difference in hardware. >>>>> >>>>>program A on single processor 1500 mhz 1400 kns >>>>>program A on dual processor 3000 mhz 2000 kns >>>>> >>>>>program B on single processor 1500 mhz 1400 kns >>>>>program B on dual processor 3000 mhz 1400 to 1500 kns >>>>> >>>>> >>>>>my question is only about the chess software. not the hardware. not the ram. >>>>>not the hash. >>>>> >>>>>is it possible with these smp programs that something else going on in the chess >>>>>software, that you can comment on. in other words if this kns is accurate and a >>>>>true value (that deep fritz is giving us), then is it possible the program is >>>>>doing something else with this second processor that will not show a kns >>>>>increase but will add to its strength. the reason for this question is that when >>>>>i run task manager in windows 2000, it shows that the program is using the >>>>>second processor with deep fritz as much as my other smp programs (90 to 100%) >>>>>but it shows no increase in kns. >>>>> >>>>>kburcham >>>> >>>>No. Because it's not solving the problem any quicker either. >>> >>> >>>For the record, if you run crafty, you will _always_ see both cpus running >>>at 100%. But it is possible that one thread is in a spin-lock waiting on >>>the other to release something, or that one is spinning waiting on work. >>> >>>IE just because a cpu is busy doesn't mean it is busy doing something >>>_useful_. :) >> >>Speaking of which, did you know Crafty reports the wrong CPU usage time in >>Windows? It always says that I am using like 90% when task manager (along with >>other utilities) say it's using 100%. >> > >I have seen this, but since I don't run windows here, I have never been able >to track it down. If you are interested, I can tell you how the timing stuff >works and perhaps get it right... Sure. Send me an e-mail. I'd do whatever I can. > > > > >>I also checked the memory paging in Crafty between 3xxMB ram and 7xxMB RAM. I >>am guessing Crafty does the global lock, because it did extremly well. Better >>than any others tested. > > >Not sure what you mean by "global lock"... Locking the memory. I've seen a lot of SMP programs swap over a MB a sec because the memory is not being locked. Almost a must in Windows 2000. Anyone who's interested, can run an SMP program on a Windows 2000 machine, and press ALT+TAB to go to another running program. See how much memory Windows 2000 swaps in order to do this. At times it can be > 3MB/sec. perfmon will report this.
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