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Date:      Fri, 07 Jun 2013 22:32:13 -0400
From:      Mark Moellering <mark@msen.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Max top end computer for Freebsd to run on
Message-ID:  <51B297AD.40707@msen.com>
In-Reply-To: <51B2723E.8010200@gmx.de>
References:  <51ABAC4D.4040302@a1poweruser.com> <51B2723E.8010200@gmx.de>

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On 6/7/2013 7:52 PM, lokadamus@gmx.de wrote:
> On 02.06.2013 22:34, Fbsd8 wrote:
>> I'm a sub second speed freak. What is the max number of cpu's and 
>> memory size that Freebsd can handle? Can it handle 16 4ghz cpu's and 
>> 32gb of memory? I need a gaming server with some really big balls for 
>> hundreds of jails. Money is not a deciding factor here, horse power is.
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> Looks like there is set up to 128 maxcpu (or no limit) since FBSD 9.0.
> http://forums.freebsd.org/showthread.php?t=13261
>
> Memory i don't know.
> With 64Bit it should many ram avaible.
>
> Greeting
>
In theory, max RAM would be 18446744073709551616 bits (2^64)  I know it 
is possible to configure a system with 64 cores (4 x 16-core cpus).  
However, I haven't seen definitive tests on scaling that far.  Last I 
saw, somewhere in the 6 to 8 core range, you really hit the point of 
diminishing returns.  If you are doing lots of jails, I would suggest 
splitting up 'sets' of jails and limiting them to run on a group of 
specific cores.  In the above configuration, you could have 8 groups of 
8 cpu-cores, each handling a specific set of jails.

Good luck




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