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Subject: Re: Memfast and chess performance

Author: Robert Hyatt

Date: 15:02:33 01/30/99

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On January 30, 1999 at 13:08:37, Enrique Irazoqui wrote:

>On January 30, 1999 at 12:44:17, Antonio Palma wrote:
>
>>But did you reboot and defragment memory ?
>
>I did reboot and load Memturbo. Is there any additional step needed to
>defragment memory? I assumed it was done automatically.
>
>>I tried on Fritz 5.32 and Nimzo 99 and it works.
>
>With Fritz 5.32 I got 289 long Fritzmarks instead of 290 and 254 short instead
>of 257, all with 192MB hashtables on a PII-400 with 256MB RAM. Rebel 10 went
>exactly at the same speed with 120MB hashtables.
>
>Enrique
>

I don't want to post a long post on computer architecture to explain why
this is a problem, but I certainly copy something I just wrote on the linux-smp
mailing list for anyone interested in the 'problem'.

In Enrique's case, he overlooked the point here...  when you load a program
into memory, sometimes you get a good physical memory layout.  Othertimes
you don't.  If the program runs under dos, this is a moot point pretty much
because memory is allocated linearly...  Under windows it is a different thing
completely.  And you sometimes get stuck into pages that map well into the
cache, other times you get stuck into a set of pages that map poorly into cache
and you get lots of overwrites...





>>On January 30, 1999 at 12:33:05, Enrique Irazoqui wrote:
>>
>>>On January 30, 1999 at 11:18:23, Antonio Palma wrote:
>>>
>>>>I have received e-mail of people interested about this ram defragmenter.
>>>>I am waiting in this newsgroup for the follow-up about fritzmark obtained and
>>>>the cpu to evaluate if this tool is really useful.
>>>
>>>I just tried it with Rebel 10, Fritz 5.32 and Junior 5, and I saw no improvement
>>>in speed at all. I already uninstalled it.
>>>
>>>Enrique
>>>
>>>>Regards
>>>>Antonio Palma



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