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From: "Edward Sanford Sutton, III" <mirror176@cox.net>
To: freebsd-questions@freebsd.org
Date: Wed, 29 Jul 2009 01:50:22 -0700
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Subject: How to get SystemMemorySize?
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Something like the following should use the power of sysctl. physmem and 
usermem in place of realmem may be of use too. Just wish I knew proper values 
nad logic to tweak kern.ipc.shmmax and similar paramaters.

int realmem;
char* realmem_mib_name = "hw.realmem";
return(sysctlbyname(usermem_mib_name, &realmem, &len, 0, 0))