From owner-freebsd-hackers@FreeBSD.ORG  Sun Mar 25 16:38:25 2012
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Date: Sun, 25 Mar 2012 11:37:25 -0500
From: Joshua Isom <jrisom@gmail.com>
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Subject: Re: capping memory usage of buildworld (c++)
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On 3/25/2012 11:10 AM, Alfred Perlstein wrote:
> It's kind of insane how much memory the compiler uses these days.
>
> Any other options?

Switch to clang which uses less memory, or use a smaller jobs number. 
Memory use is inevitable, but the benefit is more efficient binaries.