As you may know, when using memcached on 32-bit servers, processes can only address 4GB of virtual memory making the memcached daemon handle only 2 or 3 Gb of memory.
If you want to address more memory, you need to launch multiple memcached daemons.
I wrote an rc script , mmemcached, for FreeBSD to manage this.
To use [...]

The dmidecode command gives you all informations available about your memory.
With the special parameter “-t 16″, you can see the maximum (physical) memory that your server can have:
$ dmidecode -t 16
# dmidecode 2.8
SMBIOS 2.4 present.

Handle 0×1000, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 32 [...]