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# Defining Custom Execution Resource Groups

Execution resource groups define the resource requirements for execution modes. You can define custom execution resource groups using annotations in the model.

An execution resource group is a named configuration object that defines the resource requirements (threads and memory) for an execution mode. Each execution mode is associated with an execution resource group, which defines the resources that the model will consume when running in that mode.

Every app automatically supports the built-in `DEFAULT` resource group, which specifies 1 thread and no memory limit. In addition, you can use annotations in your model to define custom resource groups, which you can then reference from your custom execution mode definitions.

A resource group specifies both default and minimum values. The default values define the resource requirements that will apply unless an administrator overrides them in order to take advantage of the resources available at run time. The minimum values define the lowest allowable value for any such overrides. In many cases, the default and minimum values are the same. (For more information about overriding the resource requirements defined by a resource group, see the Xpress Insight Administrator Guide.)

Note: If you have a model that has not yet been migrated to use resource groups, you can continue to use it. Any execution modes that are defined using the deprecated `threads` annotation are implicitly mapped to automatically generated resource groups. For more information, see Defining Custom Execution Modes.
To define a custom resource group in your model, use an `insight.execresourcegroups.name` annotation, as in this example:

    (!@insight.execresourcegroups.mygroup.
      @descr My execution resource group
      @minthreads 1
      @defaultthreads 1
      @minmemory 1Gi
      @defaultmemory 2Gi
     !)

where:

`descr` | A description of the purpose of the resource group. The description must be no longer than 2048 characters.
`defaultthreads` | The default number of threads for the resource group. This must be an integer between 1 and 255, and it must be greater than or equal to the `minthreads` value.
`minthreads` | The minimum number of threads for the resource group. This must be an integer between 1 and 255, and it must be less than or equal to the `defaultthreads` value.
`defaultmemory` | The default amount of memory for the resource group, expressed using Kubernetes conventions (an integer followed by `Mi` or `Gi`).
`minmemory` | The minimum amount of memory for the resource group. This property defines the lowest value allowed if an administrator overrides the defaults, expressed using Kubernetes conventions (an integer followed by `Mi` or `Gi`.

Parent Topic Mosel Execution Modes

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