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The management of communication between workstations and local job processing, together with the notification of state updates, are performed on each Tivoli Workload Scheduler workstation by a series of management processes that are active while the engine is running. On fault-tolerant agents and domain managers these processes are based on the WebSphere Application Server infrastructure. This infrastructure is automatically installed with the workstation and allows Tivoli Workload Scheduler to:
For information on how to start and stop both the WebSphere Application Server infrastructure and the Tivoli Workload Scheduler processes on a workstation refer to Starting and stopping processes on a workstation. Except for manually starting and stopping the WebSphere Application Server and managing connection parameters when communicating across the Tivoli Workload Scheduler network, the WebSphere Application Server infrastructure is transparent when using Tivoli Workload Scheduler.
In this guide Tivoli Workload Scheduler processes or workstation processes are used to identify the following processes:netman
With the exception of standard agents, these processes are started in the following order on the Tivoli Workload Scheduler workstations:
The communication process between the monitoring agents and the event processing server is independent of the Tivoli Workload Scheduler network topology. It is based directly on the EIF port number of the event processor and the event information flows directly from the monitoring agents without passing through intermediate domain managers. A degree of fault-tolerance is guaranteed by local cache memories that temporarily store the event occurrences on the agents in case communication with the event processor is down.
The setup activities consist of launching the standard configuration file (TWS_home/jobmanrc in UNIX and TWS_home/jobmanrc.cmd in Windows) which contains settings that apply to all jobs running on the workstation. In addition, on UNIX workstations a local configuration script TWS_user/.jobmanrc is launched, if it exists in the home directory of the user launching the job. This local configuration file contains settings that apply only to jobs launched by the specific user.If any of these steps fail, the job ends in the FAIL state.
All processes, except jobman, run as the TWS_user. Jobman runs as root.
On standard agent workstations, the batchman process is not launched because this type of workstation does not manage job scheduling. These workstations only launch jobs under the direction of their domain manager. Locally on the workstation the management processes wait for a request to launch a job from the domain manager in LISTEN mode. When the request is received the job is launched locally and the result is sent back to the domain manager. For additional information on standard agent workstations refer to IBM® Tivoli® Workload Scheduler: Planning and Installation Guide.
Figure 3 shows the process tree on Tivoli Workload Scheduler workstations, other than standard agents, installed on UNIX:Figure 3. Process tree in UNIX
Figure 4 shows the process tree on Tivoli Workload Scheduler workstations, other than standard agents, installed on Windows:
On Windows platforms there is an additional service, the Tivoli Token Service, which enables Tivoli Workload Scheduler processes to be launched as if they were issued by the Tivoli Workload Scheduler user.
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