what should be memory size memcached for Django on Ubuntu Os?

A brief Description of system On i  need help for memcached size:-
1)Cpu :- i7 intel , 16 Gb Ram , Internal SATA Hard-disk :640 Gb , External Hardisk :-10 Tb, Os :- Ubuntu-32bit
2)Cpu- i2 intel core2duo , 4Gb Ram, Internal SATA Hard-disk: 320 Gb , External Hard-disk :- 2 Tb , Os:-Ubuntu-32bit
3)Cpu- i2 intel core2duo , 4Gb Ram, Internal SATA Hard-disk: 320 Gb , External Hard-disk :- 2 Tb , Os:-FreeBsd-7.0 (I am using FreeBsd with Lamson for mailing system)

Using Command line  :- memcached -d -m <memory size> -l 127.0.0.1 -p 11222
Anybody able to suggest memory size for Django, or for Dynamic python usage for high Performance computing

Regards
Vikash Ruhil

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