This node registers an instance of one of the available PDG service types with the PDG Services panel. Once a service has been registered, it can be used by the PDG graph.
You can also create PDG services directly in the PDG Services panel.
Open PDG Service Panel
Opens the PDG Services panel.
Determines when this node will generate work items. You should generally leave this set to “Automatic” unless you know the node requires a specific generation mode, or that the work items need to be generated dynamically.
All Upstream Items are Generated
This node will generate work items once all of the input nodes have generated their work items.
All Upstream Items are Cooked
This node will generate work items once all of the input nodes have cooked their work items.
Each Upstream Item is Cooked
This node will generate work items each time a work item in an input node is cooked.
The generation mode is selected based on the generation mode of the input nodes. If any of the input nodes are generating work items when their inputs cook, this node will be set to Each Upstream Item is Cooked. Otherwise, it will be set to All Upstream Items are Generated.
Create Service During
Determines when the service is created.
Creates the service during the cook stage in the same process as the Houdini session.
Creates the service when the work item is generating.
Copy Inputs to Outputs
When on, work items in this node copy input files to their output file list.
Service Already Exists
Determines how the node operates when the specified service (as defined by the Name parameter) already exists.
The node does nothing and the work item will successfully cook.
The node reports a warning and the work item will successfully cook.
The node reports an error and the work item will fail.
Determines which type of service to create. A service can belong to either the Houdini session or to a scheduler.
The service belongs to the Houdini session.
The service belongs to the scheduler specified in the Scheduler field.
The scheduler that the service belongs to. When creating a service scheduler, you are required to provide a value for this parameter.
This parameter is only available when Owner is set to Scheduler.
Determines the type of service to create.
ROP Fetch Service
The service is a ROP Fetch service.
The service is a Python service.
The service is an HDA Processor service.
Specifies the name of the service. The service Name is used as the service’s unique identifier. As such, there cannot be any other registered services with the same name.
See also Service Already Exists.
Automatically Start Service
When on, if the service is not already running, then the service will be automatically started before it’s required by a PDG cook. Services are automatically started during the pre-cook step.
Specifies the number of clients that are created by the service. Each client can process one work item at a time.
Determines which port the service will use for communication between Houdini, the MQ Server, and the service clients.
Use the automatically determined port.
Use the custom port number specified by the integer field.
MQ Server Log Level
Controls what type of information is written to the MQ server’s log file.
No information is written to the log.
Only errors are written to the log.
Warnings and errors are written to the log.
General status messages, warnings, and errors are written to the log.
MQ Server Log Directory
Specifies the logging directory in which the MQ server will create its log file.
Client Log Directory
Specifies the logging directory in which clients within the service pool will create their log files.
TOP Scheduler Override
This parameter overrides the TOP scheduler for this node.
Work Item Label
Determines how the node should label its work items. This parameter allows you to assign non-unique label strings to your work items which are then used to identify the work items in the attribute panel, task bar, and scheduler job names.
Use Default Label
The work items in this node will use the default label from the TOP network, or have no label if the default is unset.
Inherit From Upstream Item
The work items inherit their labels from their parent work items.
The work item label is set to the Label Expression custom expression which is evaluated for each item.
Node Defines Label
The work item label is defined in the node’s internal logic.
When on, this parameter specifies a custom label for work items created by this node. The parameter can be an expression that includes references to work item attributes or built-in properties. For example,
$OS: @pdg_frame will set the label of each work item based on its frame value.
Work Item Priority
This parameter determines how the current scheduler prioritizes the work items in this node.
Inherit From Upstream Item
The work items inherit their priority from their parent items. If a work item has no parent, its priority is set to 0.
The work item priority is set to the value of Priority Expression.
Node Defines Priority
This parameter specifies an expression for work item priority. The expression is evaluated for each work item in the node.
This parameter is only available when Work Item Priority is set to Custom Expression.