January 2006 - CLN-list

A good PC hardware for CLN ?
by Fabrice Marchant 14 Feb '06

14 Feb '06

Hi ! I used CLN lib on linux debian Woody and try now libcln3 on debian Sarge ( on a Athlon T-Bird 1GHz 400Mo RAM ). I think to buy a more recent PC computer. What kind of PC for CLN - processor INTEL or AMD - to execute speedly integer computations ? Is motherboard worthy ? Thank you for your help. Fabrice

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how to assign cl_I type to structure number
by mahesh ram 06 Feb '06

06 Feb '06

i am r.seetaram, M.Tech, C.S. i have faced the following problem: cl_I val=10; struct node { cl_I data; struct node * link; }; struct node * start=NULL; start = (struct node *) malloc(sizeof(struct node)); start->data = value; // error in this line; --------------------------------- Yahoo! Autos. Looking for a sweet ride? Get pricing, reviews, & more on new and used cars.

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Re: Re: A good PC hardware for CLN ?
by Fabrice Marchant 28 Jan '06

28 Jan '06

> 1. Re: A good PC hardware for CLN ? (Joerg Arndt) > 2. Re: A good PC hardware for CLN ? (Richard B. Kreckel) Thank you very much for your answers. > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 24 Jan 2006 16:33:40 +0100 > From: Joerg Arndt <jj(a)suse.de> > I invariably recommend AMD64 these days (socket 939). > > My off the shelf 2.2GHz system is on par with a 3.6GHz intel > equivalent (EMT64(?), ex-pen-sive!) for the interesting stuff. System > is 2-3.5 times faster than Athlon at same clock. Memory throughput is > a dream. > > The timings given (by Granlund) are a true eye opener: > http://swox.com/doc/x86-timing.pdf > > Today's intel 64bit cores are a lousy hack at best. > > Alternative architectures (PPC) might be fine but are surely > much more expensive. I'll follow you and the document : AMD64 ! Are dual core useful ? I looked at the prices (France) in this cheap store : http://www.ldlc.com/navigation/cat.html?sscat=140025&constructeur=C00000080… I noticed on this page : - AMD Athlon 64 3700+ - 2.2 GHz, Cache L2 1 Mo Socket 939 0.09 micron - Core San-Diego (version boîte) 259,01 euros and - AMD Athlon 64 X2 Dual-Core 3800+ Socket 939 0.09 micron (version boîte) 338,99 euros. > > Message: 2 > Date: Tue, 24 Jan 2006 22:45:39 +0100 > From: "Richard B. Kreckel" <kreckel(a)ginac.de> > Even without x86-64 Assembler code, the use of 64 bit Digits gives an > very impressive performance gain. If you buy such a machine, make sure > to run int in 64 bit userland if arbitrary precision arithmetic is > important for what you're doing. Please, what does 64 bit userland mean ? Maybe recompiling your .cc sources for 64 bits will improve the speed too ? Does g++3.3 is able to produce such code ? Arbitrary precision arithmetic is a fun stuff and then very important to soften the hard life ! Sorry for my poor english language. When I wrote : "Is the motherboard worthy ?", that didn't had any meaning. I meant : "Is the motherboard important for speed too ?". I wonder if processor cache size is important for integer computations with CLN ? ( I focus on integers. ) And RAM amount ? Dual channel ? Can we forget hard drive perfs, hoping a huge RAM avoids to swap ? Regards Fabrice

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