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You can enable or disable hyperthreading by using a BIOS setting for the processor during the BIOS setup. You might want to disable hyperthreading when the performance for each virtual processor is important. The virtual machines' compute load on that logical processor is mapped to a thread of execution on the physical processor in the host server.
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These logical processors can be mapped to virtual machines on the server. But it contains only 16 logical processors with hyperthreading disabled. The reason is that the processor architecture is not visible to the guest applications.įor example, a server that has four sockets populated with quad-core processors and the ability to enable two hyperthreads per core contains 32 logical processors with hyperthreading enabled. In a virtualized environment, the compute capacity limit is based on the number of logical processors, not cores.
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(This licensing is not available for new agreements.) There are no limits under the Core-based Server Licensing model.
#MICROSOFT SQL SERVER 2016 EXPRESS LIMITS LICENSE#
*Enterprise Edition with Server + Client Access License (CAL) licensing is limited to 20 cores per SQL Server instance. Limited to lesser of 4 sockets or 24 cores Maximum compute capacity for a single instance (AS, RS)Įnterprise Edition: Core-based Licensing* Maximum compute capacity for a single instance (SQL ServerDatabase Engine) The following table specifies the compute capacity limits for a single instance of each edition of SQL Server: SQL Server edition In fact, deploying multiple instances of SQL Server on the same physical server is an efficient way to use the compute capacity of a physical server with more sockets and/or cores than the capacity limits allow. They do not constrain the server where the instance may be deployed. They represent the maximum compute capacity that a single instance will use. These limits apply to a single instance of SQL Server. The compute capacity of the two logical processors in the hyperthreaded core is greater than the compute capacity of the same core with hyperthreading disabled.Įach edition of SQL Server has two compute capacity limits:Ī maximum number of sockets (or physical processors or processor packages)Ī maximum number of cores as reported by the operating system The compute capacity of a logical processor from a single thread of a hyperthreaded core is less than the compute capacity of a logical processor from that same core with hyperthreading disabled. For example, if your computer has two quad-core processors with hyperthreading enabled and two threads per core, you have 16 logical processors: 2 processors x 4 cores per processor x 2 threads per core. Each thread of execution appears as a logical processor. Systems with more than one physical processor or systems with physical processors that have multiple cores and/or hyperthreads enable the operating system to execute multiple tasks simultaneously. A physical processor is the same as a processor package or a socket. It can consist of one or more logical processors.Ī physical processor can consist of one or more cores. The following definitions apply to the terms used in this article:Ī thread or logical processor is one logical computing engine from the perspective of SQL Server, the operating system, an application, or a driver.Ī core is a processor unit. When the mapping of cores to logical processors is: A core is mapped to one or two logical processors.One to many, it represents a multi-core chip installed in the socket.One to one, it represents a single-core chip installed in the socket.One to zero, it represents an empty socket.A socket is mapped to zero or more cores.Zero to many, it represents the absence of virtual machine on the host system.One to many, it represents an overcommit.One to zero, it represents an unbound logical processor not used by the guest operating systems.When the mapping of virtual processors to logical processors is: Zero or one virtual processor is mapped to zero or more logical processors.One or more virtual processors are allocated to exactly one virtual machine.A virtual machine (VM) has one or more virtual processors.