Quads & Seti

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Profile AlphaLaser
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Message 620083 - Posted: 16 Aug 2007, 5:35:52 UTC - in response to Message 619916.  
Last modified: 16 Aug 2007, 5:39:07 UTC

do you think 4gb is enough?


No idea/experience with servers. Currently I don't have alternatives to a Laptop so that's what I use. When I had been in the shop recently to ask about a new Laptop with a C2D, I was told not to exceed 2gig of RAM, because it's a 32bit CPU, which can't use a bigger amount properly. It may be different with quads(which I don't think) or for servers, no idea.

Happy crunching, Christoph


Actually, with 32bit addressing, the limit is 4GB total. Due to the way 32bit hardware was designed, only 2GB can be accessed by a single application (though there's not too many home machines-based software that actually needs that much other than some newer games).

However, ever since the Pentium Pro (the first Intel 686-class chip), a special memory addressing mode is available up to 36bit, which allows for a total of 64GB of addressable memory. Unfortunately, this requires an OS that supports this 'feature' (Linux fans will quickly point out that Linux supports this feature, some version of Windows did until Microsoft artificially limited it to 32bit addressing with later "patches"), and it still does nothing for the application barrier of 2GB.


I think the real concern is what's mentioned in this blog post, which is that memory addresses in the upper range get mapped to system resources besides RAM. Thus Windows does not make that memory available to programs. The limitation stems mostly from the memory being mapped for video.
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Profile Francois Piednoel
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Message 620144 - Posted: 16 Aug 2007, 8:08:03 UTC - in response to Message 620083.  

the Q6600 at its price is hard to ignore, and it can be a long term investement. by buying a Dual core, when the Quad is close in price!
its life span will be longer than a Dual Core.

if you look at one of my computer, it is running my own code, I am pretty happy of the performance of it :) Large scale demo soon.

who?
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Message 620150 - Posted: 16 Aug 2007, 8:16:10 UTC - in response to Message 620144.  

the Q6600 at its price is hard to ignore, and it can be a long term investement. by buying a Dual core, when the Quad is close in price!
its life span will be longer than a Dual Core.

if you look at one of my computer, it is running my own code, I am pretty happy of the performance of it :) Large scale demo soon.

who?


Who?.......
Just curious. Over the last weekend, I upgraded my phased quaddy to x64 crunching. Do your optimizations help in 64 bit? Or do they apply equally to 32 and 64 bit crunching?

"Freedom is just Chaos, with better lighting." Alan Dean Foster

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Message 621903 - Posted: 18 Aug 2007, 12:58:57 UTC - in response to Message 620028.  

As a rule of thumb, servers don't need fast processors. They need lots of memory and fast disks.

A dual-core processor is probably overkill for home, and certainly more than adequate for the office, even running resource hogs like Exchange.

... unless you're also crunching SETI.

If you also want to play with different configurations, I'd think about something that'd run VMware Server well.


Thanks Ned, took your advice on board. Decided to swap my main system's board & cpu into the server box & put quad in my system.

Windows Home Server has been released in Auz/NZ on 17th Aug & will be released here in the UK on 22nd Aug (hopefully).

So, again hopefully, should have server up & running by the end of Sept.

I have VMWare Server on network, but from what I have seen of WHS(scaled version of Server 2003 R2) I may have to upgrade my version of VMWare.

I am using version 1.0.1
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Message 622225 - Posted: 18 Aug 2007, 21:08:40 UTC

About 4 GB of RAM.

I have done some reading before I put together my C2D in June and what I learned is that Win. Xp will not work well with more then 3 GB of RAM. There are several articles on M$ website explaining why and how to make it work with server version of M$ OS. I have opted for a 2 GB kit (two 1 GB sticks) of DDR2. Bottom line is that whatever you decide to do about RAM, 4 GB is a waste of money for plain M$ OS. If you run sever version (M$ 2003 Sever?), then you will be able to take advantage of the 4 GB RAM.
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Message boards : Number crunching : Quads & Seti


 
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