[GENERAL] postgre on virtual machine

[Georgi Ivanov]

Hi,
Is there any specific reason one should/should not run postgre on virtual
machine for production ?
Is there any special tuning for virtual environment ?
Client of mine is running 8.4 on  virtual machine (VMWare ) so I'm wandering
if there is anything special I can tune to speed up a bit.
Also if I must choose between more RAM and more virtual cores what should I
choose ?