Currently, VMware ESX 3.0 supports up to four processors dedicated to a single virtual machine, Microsoft Virtual Server 2005 R2 does not support multiple processors for a virtual machine, and XenEnterprise 3.1 supports up to 32 processors per Linux virtual machine guest. However, look for multi-processor support in Microsoft's upcoming hypervisor in Server Longhorn, codename "Viridian," and Windows guest multi-processor support in XenEnterprise 3.2.
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