Date: Fri, 26 Dec 2008 12:12:57 -0500 From: Tim Kellers <timothyk@wallnet.com> To: Michel Talon <talon@lpthe.jussieu.fr> Cc: freebsd-questions@freebsd.org Subject: Re: Dell 2850 use 32 or 64 bit? Message-ID: <49551099.5070902@wallnet.com> In-Reply-To: <20081226144759.GA3715@lpthe.jussieu.fr> References: <20081226144759.GA3715@lpthe.jussieu.fr>
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Michel Talon wrote: > Tim Kellers wrote: > >> Thanks for the reply. I already know it is 64 bit capable. I 'm >> interested in finding out if their are measurable performance advantages >> to running it using 64 v 32 bit FreeBSD. >> > > For the type of use of the OP (databases, etc.) i don't know, but > for scientific computations we observe a massive performance advantage > running in 64 bits mode (by this i mean more than 20%, i have seen some > Maple formal computations run 100% faster). The only problem with > 64 bits mode is that some ports may have problems, but, as far as i > know, these ports are more desktop oriented than server oriented. For a > server i don't see a reason to run in 32 bits mode. Contrary to > some frequent assertions the increase in size of binaries is > extremely limited as can easily be checked. This is very largely > compensated by the increase in the number of registers. The possibility > of using more than 4 gigs memory is just one advantage of 64 bits mode, > and by the way, very few of our machines have more than 4 gigs memory, > and they don't lack it at all. > > > Thanks, that was exactly what I needed to know. There won't be any Desktop apps on this machine and optimal performance is what I am after. Tim
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