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Services: Work Processes Types
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Every work process is specialized in a particular task type: dialog, batch, update, enqueue, spool, message, or gateway. The last two types are somewhat different than the rest. In client/server terms, a work process is a service, and the computing system that is running the particular services is known as a server. For example, if the system is just providing dialog services, this is a dialog server, although commonly called an application server. The dispatcher assigns tasks to the free work processes, making optimal use of system resources and balancing the system load. The dispatcher knows and distributes accordingly the pending tasks according to the processing type of the defined processes. The difference among the various work processes only affects their mission or special services as assigned to the work processes through the dispatching strategy. Figure 2 6 shows the work processes from within R/3. To get to this screen, select Tools Administration Monitor System Monitoring Process Overview, or type /NSM50 in the command field.
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Figure 2 6: Displaying work process within R/3. Figure 2 7 shows the same work processes from the perspective of the Windows NT processes. If you look at the PID (process identification) numbers on both screens, you might notice that they are the same.
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Figure 2 7: Work processes as seen in the Windows NT Task Manager.
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The dialog work processes are in charge of the interactive tasks of the R/3 system. A dialog work process performs the dialog steps corresponding to the interactive user sessions. The jobs held by the dispatcher in the request queues after user input are assigned to the next free work process. The dialog work processes execute just one single dialog step at a time and become immediately free for the next user request (dialog step), which is assigned by the dispatcher. This means that the dialog work processes can be constantly switching between different user sessions. This type of processing allows a great deal of resource distribution; otherwise the system would need as many dialog work processes as the number of expected interactive users. It works exactly the same as multiuser operating systems. The SAP profile parameter that controls the number of interactive dialog work processes per instance is
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4 explains with greater detail the profile parameters. Depending on the type of business transactions the users are working on, a dialog work process can support from 5 to more than 10 simultaneous users each. This means that 10 dialog work processes could theoretically support approximately 100 users. However, this is just a rule of thumb. Tuning this parameter means that if users have to wait long to get a free work process, you should increase the parameter. This, however, has some limitations, such as the total number of processes running on the server and the availability of main memory. When there is a large number of concurrent interactive users expected in a SAP R/3 system, there will certainly be a number of application servers. Some of these application servers can become special dialog servers, containing a dispatcher process and a number of dialog work processes.
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Dialog Work Processes Dialog Step Data Flow Figure 2 8 shows the flow of a user request through the different components and processes. Initially, the user enters data into the screen fields and presses the Enter key. This data is received by the SAPGUI process and is converted to an internal format and immediately sent to the application server dispatcher (1).
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Figure 2 8: Data flow in dialog steps. The dispatcher checks whether there are available work processes for processing the dialog step. If there are not, the request goes to the request queues (2) until one becomes available. Once a dialog work process is available, the dispatcher sends the user data to the work process (3). Within the dialog work, the task handler is in charge of assigning the corresponding tasks to the internal components (dynpro or ABAP), using the SAP memory buffers, using the roll and page area for user context storage and switching, and finally sending a SQL request to the database (4). The database system sends the requested data back to the work process (5), which in turn passes it to the presentation server (6). The SAPGUI formats the data and fills up the screen for the user (7). The time it takes to get from step 1 (user request) to step 7 is known as response time. The response time is one of the main indicators of how healthy (well tuned) the system is. A SAP instance profile parameter controls the maximum allowed time for interactive execution of a dialog step:
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