Computing service with configurable virtualization control levels and accelerated launches

A computer-implemented method, comprising:

• in response to one or more programmatic requests from a client of a virtualized computing service of a provider network, (a) provisioning a single-tenant host for one or more virtual machines of the client and (b) determining that oversubscription of processing units of the single-tenant host is permitted;
• in response to a first launch request from the client, launching a first virtual machine on the single-tenant host, wherein the first virtual machine is configured to utilize up to a first count of processing units;
• and
• in response to a second launch request from the client, launching a second virtual machine on the single-tenant host, wherein the second virtual machine is configured to utilize up to a second count of processing units, wherein a total count of processing units allotted to virtual machines running on the single-tenant host exceeds a processing unit capacity of the single-tenant host, and wherein the total count includes the first count and the second count.

A system, comprising:

• one or more computing devices;
• wherein the one or more computing devices include instructions that upon execution on or across the one or more computing devices cause the one or more computing devices to:
• in response to one or more programmatic requests from a client of a virtualized computing service of a provider network, (a) provision a single-tenant host for one or more virtual machines of the client and (b) determine that oversubscription of processing units of the single-tenant host is permitted;
• in response to a first launch request from the client, launch a first virtual machine on the single-tenant host, wherein the first virtual machine is configured to utilize up to a first count of processing units;
• and
• in response to a second launch request from the client, launch a second virtual machine on the single-tenant host, wherein the second virtual machine is configured to utilize up to a second count of processing units, wherein a total count of processing units allotted to virtual machines running on the single-tenant host exceeds a processing unit capacity of the single-tenant host, and wherein the total count includes the first count and the second count.

One or more non-transitory computer-accessible storage media storing program instructions that when executed on or across one or more processors cause the one or more processors to:

• in response to one or more programmatic requests from a client of a virtualized computing service of a provider network, (a) provision a single-tenant host for one or more virtual machines of the client and (b) determine that oversubscription of processing units of the single-tenant host is permitted;
• in response to a first launch request from the client, launch a first virtual machine on the single-tenant host, wherein the first virtual machine is configured to utilize up to a first count of processing units;
• and
• in response to a second launch request from the client, launch a second virtual machine on the single-tenant host, wherein the second virtual machine is configured to utilize up to a second count of processing units, wherein a total count of processing units allotted to virtual machines running on the single-tenant host exceeds a processing unit capacity of the single-tenant host, and wherein the total count includes the first count and the second count.