Analyzing a Performance Data File in Software

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Analyzing a Performance Data File
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Figure 7 35: Performing a runtime analysis. Options Description With subroutines Indicates whether or not the PERFORMs are included in the analysis. By default, they are included. If they are not included, the runtime of each PERFORM is assigned to the program that makes the call. With internal Includes in the detailed analysis the instructions related to internal tables (COLLECT, tables APPEND, etc.). With technical DB Logs technical information about the database operations. This option takes a lot of info resource consumption, so it is not advisable except for in very specialized situations. With memory Logs the memory management information for the work processes. management Function module Only logs the calls to a single function module. Particular units Only logs the activity of a part of the program. These parts can be defined: Statically: the instructions SET RUN TIME ANALYZER ON and SET RUN TIME ANALYZER OFF are included to mark the area to be analyzed. Dynamically: in this case, the beginning and end of the analysis are defined by running, at the required moment, the option System Utilities Runtime analysis Switch on or System Utilities Runtime analysis Switch off. All Keeps a log of all the activity of the program. The performance data files are created at the operating system level in the instance data directory. These files might occupy a lot of storage space, so be sure to remove files which are no longer needed.
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Analyzing a Performance Data File
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On the initial ABAP runtime analysis screen, select the Runtime Analysis Other perf. File menu option or just click on the Perform. Files push button. The system will display a dialog box for selecting the user or object from which to select the trace corresponding to the performance data file. According to the previous selection, the system displays a list of the existing trace files. Select a file clicking in the check box next to it, then click on the Analyze button. The system then displays the Overview Runtime Analysis Evaluation screen including a bar chart with the total execution times and the statistics for the execution of some of the program actions. Figure 7 36 shows an example. 247
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Figure 7 36: Example of runtime evaluation analysis. By clicking on the available buttons, you can analyze several types of information. The following is a summary of these functions. Displayed Information Displays a list with the most "system expensive" instructions ordered by execution time. The list includes the program, number of executions, and type of instructions (ABAP, database, or R/3 system). Tables Displays the most important tables, the number of accesses, and the time needed for the accesses. It also indicates whether the table is included in any of the buffers. Group hit list Displays a list with the performed instructions classified by instruction type: PERFORM, MODULE, CALL FUNCTION, and so on. Call Hierarchy Presents a chronological listing with the flow of calls during the execution of a program or transaction. For a correct understanding of the output of the runtime analysis, it is important to know the difference between the terms Gross time and Net time: Gross time: the total time including the times of all the subcomponents (MODULE, PERFORM, CALL FUNCTION, CALL SCREEN, CALL TRANSACTION, CALL DIALOG, SUBMIT) Net time: the gross time minus the times of the subcomponents. It is possible to reduce the number of call types that the runtime analysis presents in the output listings by using a filter. This filter can be activated from the initial runtime analysis screen selecting the menu option Edit Display filter or by clicking on the Display filter icon. Button Hit list
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