ESX，KVM和QEMU之間的區別

Question

ESX，KVM和QEMU之間的主要區別是什麼？

Answer 1

Qemu是一個開源的用戶空間虛擬機監視器。它使用二進制翻譯來運行客戶指令。

Pros : 
1) Has support of helpers which help a lot in debugging 
2) Can be used to run guest of a different ISA. (You can emulate an ARM guest on x86 desktop) 
3) Does not need hardware support 
4) code is available. you can modify it for debugging 

缺點：

1) Slow 

KVM是其在Linux內核中實現一個開源虛擬機監視器。 Qemu可以使用/ dev/kvm接口在KVM上運行guest虛擬機。

Pros: 
1) very fast 
2) code is available in the kernel tree. you can modify it for debugging 

Cons: 
1) needs hardware support 
2) Requires a user level software for interfacing (generally qemu) 

VMX是VMWare的虛擬機監視器。 VMX的源代碼不是免費的。但它支持用戶空間以及硬件支持的仿真。

Pros : 
1) Very easy to use. GUI is good. 
2) Fast and configurable. 

Cons : 
1) Cannot modify it to obtain more information about the guest.