可能重复:
GUID 和 UUID 之间有什么区别吗?
GUID 和 UUID 之间有什么区别,我应该使用哪个来实现真正的唯一性?
更新:在我选择的算法中,我还需要哪些东西来实现唯一性?
1) MAC address of network card
2) 128 bits (isn't 64 bits enough?)
3) What if I have a multicore machine on the same MAC address. Isn't there a chance of duplicates?