Xen is fast and completely free.

Xen的速度很快而且是完全免费的。

youdao

Support for Xen virtualization

支持Xen 虚拟化技术

youdao

Figure 1 shows the Xen architecture.

图1显示了Xen的架构。

youdao

Within this time we managed to create a new Xen instance, boot it, and run the application that rendered the page you are viewing.

FORBES: Super Elastic Clouds: Is it Time to Remove the OS From Cloud Computing Stacks?

Using open source virtualization technologies like KVM and Xen, ULAP is managed with the EUCALYPTUS and OpenStack cloud management platforms.

FORBES: How Cloud Computing Can Boost Developing Nations

But if you take into account the use of open source products like Xen and KVM in massive data centers, web server farms, and by web application providers like Google and Salesforce.com, the CPUs running open source virtualization likely dwarfs the commercial market.

FORBES: Red Hat At $1 Billion