How to Control CPU Usage in the Global Zone

Perform this procedure to assign CPU shares to a resource group that will be executed in a global zone.

If a resource group is assigned CPU shares, Sun Cluster performs the following tasks when it starts a resource of the resource group in a global zone:

• Augments the number of CPU shares assigned to the global zone ( zone.cpu-shares) with the specified number of CPU shares, if this has not already been done.

• Creates a project named SCSLM_resourcegroup_name in the global zone, if this has not already been done. This project is specific to the resource group, and is assigned the specified number of CPU shares (project.cpu-shares).

• Starts the resource in the SCSLM_resourcegroup_name project.

For more information about configuring the CPU control facility, see the rg_properties(5) man page.

1. Set the default scheduler for the system to be fair share scheduler (FSS).

   # dispadmin -d FSS

   FSS becomes the default scheduler on next reboot. To make this configuration take effect immediately, use the priocntl command.

   # priocntl -s -C FSS

   Using the combination of the priocntl and dispadmin commands ensures that FSS becomes the default scheduler immediately and remains so after reboot. For more information about setting a scheduling class, see the dispadmin(1M) and priocntl(1) man pages.

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   Note –

   If the FSS is not the default scheduler, your CPU shares assignment will not take effect.

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2. On each node to use CPU control, configure the number of shares for the global zone and the minimum number of CPUs available in the default processor set.

   Setting these parameters helps protect processes running in the global zone from competing for CPUs with processes running in non-global zones. If you do not assign a value to the globalzoneshares and defaultpsetmin properties, these properties take their default values.

   # clnode set [-p globalzoneshares=integer] \ [-p defaultpsetmin=integer] \ node

   -p defaultpsetmin=defaultpsetmininteger

   Sets the minimum number of CPU available in the default processor set. The default value is 1.

   -p globalzoneshares=integer

   Sets the number of shares assigned to the global zone. The default value is 1.

   node

   Specifies nodes on which properties are to be set.

   In setting these properties, you are setting properties for the global zone. If you do not set these properties, you cannot benefit from the RG_SLM_PSET_TYPE property in non-global zones.

3. Verify that you correctly set these properties.

   # clnode show node

   For the node you specify, the clnode command prints the properties set and the values that are set for these properties. If you do not set the CPU control properties with clnode, they take the default value.

4. Configure the CPU control facility.

   # clresourcegroup create -p RG_SLM_TYPE=automated \ [-p RG_SLM_CPU_SHARES=value] resource_group_name

   -p RG_SLM_TYPE=automated

   Enables you to control CPU usage and automates some steps to configure the Solaris OS for system resource management.

   -p RG_SLM_CPU_SHARES=value

   Specifies the number of CPU shares that are assigned to the resource group-specific project, project.cpu-shares and determines the number of CPU shares that are assigned to the global zone, zone.cpu-shares.

   resource_group_name

   Specifies the name of the resource group.

   In this procedure, you do not set the RG_SLM_PSET_TYPE property. In the global zone, this property takes the value default.

   This step creates a resource group. You could alternatively use the clresourcegroup set command to modify an existing resource group.

5. Activate the configuration change.

   # clresourcegroup online -M resource_group_name

   resource_group_name

   Specifies the name of the resource group.

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   Note –

   Do not remove or modify the SCSLM_resource_group_name project. You can add more resource control manually to the project, for example, by configuring the project.max-lwps property. For more information, see the projmod(1M) man page.

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