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A PDG service is a long-running process that acts as a server for cooking work items. When a node is configured to use a PDG service, a cooking work item will submit the job to a pool of services. The first service that is available will retrieve the work item and perform its work.
PDG services avoids the overhead associated with starting a new process. Services can also perform optimizations specific to their jobs (for example, the HDA Processor service can create the necessary nodes exactly once, reusing the same nodes for each job and avoiding the time associated with creating the network). As a result, PDG services can vastly increase the speed of your jobs.
PDG Services panel
To open the PDG Services panel:
In the TOPs Tasks menu, select PDG Services.
Create a new Pane Tab and then from the panes menu select New Pane Tab Type ▸ TOPs ▸ PDG Services.
PDG Services list
Starts the selected PDG service.
Stops the selected PDG service.
When on, the selected service is automatically started by the first PDG graph cook where the service is used (if the service is not already running).
Shows whether the selected service is running or stopped.
Specifies the service node type for the selected PDG service.
Specifies the name of the selected PDG service.
Sets the number of instances that will be created for the service pool. More instances will result in faster cook times because more items will be able to be cooked in parallel.
Shows the owner of the service. Currently, a service can only be owned by the Houdini session.
Shows the name of the scheduler type that the service is associated with.
For some scheduler types, a service must be run with respect to a specific scheduler node. You can specify the scheduler node with this field.
MQ Server Log Level
Shows the logging level of the MQ server associated with the service.
MQ Server Log Directory
Shows the directory where the logging file for the MQ server will be stored.
Client Log Directory
Specifies the folder where service pool clients will write their log files.
Add PDG Service window
The service type associated with the registered service.
Controls the owner of the service. Currently, the service can only be owned by the Houdini session. This means that the lifetime of the service is associated with the current Houdini session. If the service is still running when Houdini is exited, the service will be shut down automatically.
Automatically Start Service
When on, the service is automatically started (if it’s not already running) during the first PDG cook where the service is used.
The number of clients that are created by the service.
The defined port configuration.
The port that the service will use is determined automatically.
The port that the service will use is a custom port you need to specify.
MQ Server Log Level
Controls what type of information is written to the MQ server’s log file.
No information will be logged.
Only errors will be logged.
Warnings and errors will be logged.
General status messages, warnings, and errors will be logged.
MQ Server Log Directory
Specifies the logging directory in which the MQ server will create its log file.
Client Logging Directory
Specifies the logging directory in which Clients within the service pool will create their log files.
Registers the service.
Cancels the service registration operation.
PDG Services nodes
These are the steps for using a PDG service with one of the supported node types.
Add a PDG service
In the PDG Services window, click Add Service located in the PDG Services list.
The Add PDG Service window appears.
In the Add PDG Service window, specify all the service details you want for the new service including configuring any nodes that you want to use the service.
For this step, please consult the node’s documentation for information on configuring the node to use the service.
The new registered service appears in the PDG Services list.
Also now when any associated configured nodes cook, they will use the new PDG services pool to cook their work items.
Start a PDG service
In the PDG Services window, select the service you want to start from the PDG Services list list.
Stop a PDG service
In the PDG Services window, select the service you want to stop from the PDG Services list list.
Remove a PDG service
In the PDG Services window, RMB-click+hold on the name of the service you want to remove.
Click the Remove Service RMB option that appears.
The selected service is removed from the PDG Services list.
You can re-register a PDG service at any time.