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其實cloud service早就發現你呢啲人bitching about vm performance
所以佢哋都出咗bare metal hosting
你要effectively use cloud
首先你要有一個完善嘅scaling system
cloud嘅賣點係flexibility同scalability 乜傳統嘅server可以做到on perm change hardware咩
你用cloud 可以從1c 1g ram 或者等一分鐘+reboot就變成4c 8g ram
當然 scaleable嘅代價係 你要預咗啲野因爲無得effectively bin packing所以要畀貴啲
有啲人嘅需求可能就係咁少嘅spec就應付到 譬如你行個wp 得個php同maraidb係唔駛scaling
但係呢個fixed spec 用vps同cloud比可以係1:2嘅差價...
所以有啲人會話cloud佢係雞肋: 點解cloud咁overpriced
而且理論上bare metal同vps今時今日已經無乜差距
95% bare metal performance with some context switch overhead in host machine