Configuring CPU Control

This section includes the following procedures:

• How to Control CPU Usage in the Voting Node on a Global Cluster

How to Control CPU Usage in the Voting Node on a Global Cluster

Perform this procedure to assign CPU shares to a resource group that will be executed in a global–cluster voting node.

If a resource group is assigned CPU shares, Oracle Solaris Cluster software performs the following tasks when it starts a resource of the resource group in a global–cluster voting node:

• Augments the number of CPU shares assigned to the voting node ( 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 voting node, 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-cluster voting nodes and the minimum number of CPUs available in the default processor set.

   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 shares available in the default processor set. The default value is 1.

   -p globalzoneshares=integer

   Sets the number of shares assigned to the voting node. 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 voting node.

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 Oracle 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 voting node 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 voting node, 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 -emM 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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