Monitoring the System Work Processes in Software

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Monitoring the System Work Processes
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To display the status of the work processes of the application server where you are logged on to, select Tools Administration Monitor System monitoring Process overview (transaction code SM50). Administrators should regularly monitor the system processes to determine if the number and configuration is appropriate. The process overview offers only a snapshot of the processes, so you have to press the Refresh button to get a better view of what's going on. Notice that you can only display the processes of your local system. To display other server processes, call the server monitoring transaction explained in the previous section and, from a selected server on the list, select the Processes function.
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Monitoring the System Work Processes The SAP work processes correspond to operating system processes. You could also monitor these processes from the operating system. In fact, the field PID matches exactly to the Process Id of the underlying operating system. With a UNIX command such as ps eaf \ grep dw, you can see the SAP processes. On Windows NT systems you can see the processes from the Task Manager as disp+work. The SAP runtime directory (/usr/sap/<SID>/SYS/exe/run) contains some monitor programs which allow you to see some of the work processes and the dispatcher from the operating system. Refer to the section entitled "SAP R/3 Directory Structure" in Chap. 4 for more information. The work process overview presents detailed information in different columns. Notice that in order to see all the available columns you might have to scroll horizontally using the scrolling buttons on the bottom part of the screen. The columns in the work process overview screen show the following information: No. Refers to the internal ID number of a process. It is useful for identifying messages in the system log belonging to a work process. Ty. It's the type of work process. 2 explains in detail each of the SAP work process types. On this screen, you can find the following types: DIA. Dialog work processes, in charge of executing interactive dialog steps UPD. Update work process for executing U1 update components (refer to the section entitled "Updating Process Concepts" later in this chapter). In charge of critical updates on the database UP2. Update work process for executing U2 update components. In charge of performing secondary updates on the database ENQ. Enqueue work process in charge of setting and releasing lock objects BTC. Background work processes, in charge of executing background jobs SPO. Spool work process in charge of the SAP spooling system (formatting and printing) PID. Process identification number of the work process which matches the PID of the operating system process. Status. Shows the current state of the work process. Observe that the process overview screen always offers a snapshot of the processes. So, upon pressing the Refresh icon, it can change. Possible process status are Running. The process is executing a system request. Waiting. The process is idle and waiting for any system request. Hold. The process is held by a single user. Although a Hold state can be normal, having too many processes in hold state affects the system performance. Killed or Complet. The process has been aborted with the Restart option set to No. Stopped. Due to system or application error, the process has stopped and could not restart automatically. When the process overview displays many processes with status waiting, it means that the system load is low. When this happens, the SAP dispatcher will try to allocate the same work process for a user, and thus avoid rolling in and out the user contexts. Reason. This column displays a mnemonic code displaying the reason for a work process with a hold status. Some of the reasons can be activities performed by the lock mechanism, the update process, debugging, CPIC tasks, or RFC requests. If the reason columns display Priv, it means that a work process has been reserved for a private use in a particular ABAP transaction requiring a large paging storage. This mechanism prevents the rolling in and out of the user contexts and the ABAP paging. Start. This column has either the values Yes or No and indicates whether the work process will be automatically restarted in the event of an abnormal termination. Normally, this field is set to Yes but you can switch the restart status by selecting the function Restart after error from the Process menu. 350
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Monitoring the System Work Processes Err. Contains the number of times a work process has terminated abnormally. Sem. This column can contain the number of the semaphore on which a work process is waiting. Normally, this field is empty. However if you notice that a semaphore number appears often, it might indicate some performance problems in the system and might need some parameter adjustments. CPU. Contains in number of seconds the CPU time consumed by a work process. Time. Indicates the elapsed execution time used by the work process for the dialog step that it is currently processing. This column usually contains a small figure. When it displays a large figure, it might indicate that the process is being held in a debugging session. Program. This column contains the ABAP program that is currently executing. Client. Indicates the SAP system client where the session is being executed. User. Contains the user ID whose request is being processed. Action. Under this field the system shows the actions being performed by the running program. These actions are the same as those recorded by the system performance monitor which is activated by default with the profile parameter stat / level. This column might display actions such as sequential read, insert, or direct read. Table. This column displays the name of the tables being accessed, if any. There is more detailed information available from the process overview screen which you can display by selecting the work processes and then clicking on the Detail info button on the application toolbar. With this option, in addition to all the information from the overview screen, the system displays statistical information about the work process such as the memory, development environment, and database usage. From the process overview display, you can perform additional options by selecting them from the menu item Process. You can terminate a work process with or without generating a core dump file in the operating systems, which can be used for debugging. Before canceling a work process, you should select the menu function Restart after error, either with options Yes or No, to indicate whether the process which is to be canceled should restart or not, after being manually terminated. By selecting a work process and then selecting the Process Trace Active components option from the menu, you can activate a trace and choose what is to be traced in the work process, which is stored in the so called low level developer traces files (dev files). Figure 10 3 shows the available tracing options for the work processes, where you can decide the level of tracing information to get.
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