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As discussed in this chapter s introduction, profiling an application determines how often each portion of the application executes and how it performs each time it executes The goal of most application profiling work is to identify the portions of your application that are the most resource intensive, either computationally or in terms of memory consumption Once you have this information, you can then look for ways to improve the performance of those functions or your entire application in those areas The gcov application, discussed in the first half of this chapter, is designed to provide general profiling information that tells you how often each basic block (sequence of uninterruptible, sequential statements) executes during one or more test runs of the application The GNU gprof application, designed for profiling, provides much more detailed analysis of your application and the functions it executes internally than gcov can provide.

The token PRIMARY KEY is included at the end of the column definition. A composite primary key is the unique combination of more than one column in the table. In order to define a composite primary key, you must use a table constraint instead of a column constraint. Setting a single column as the primary key within the column definition is called a column constraint. Defining the primary key (single or composite) outside of the column definition is referred to as a table constraint. The syntax for a table constraint for a primary key is as follows: CONSTRAINT constraint_name PRIMARY KEY (column [ ASC | DESC ] [ ,...n ] ) Table 4-6 details the arguments of this command. Table 4-6. Table Constraint,Primary Key Arguments

The GNU gprof application was inspired by the BSD Unix prof application (also found in many System III and System V Unix variants) Because GCC compilers are widely used on a variety of systems, the gprof application provides options to produce output in the file formats used by prof, in case prof is still supported and used on your computer s operating system The GNU gprof application provides several forms of profiling output: A flat profile: Shows the amount of time your application spends in each function, the number of times each function is called, the amount of time spent in profiling-related overhead in each function, and an estimation of the margin of error in the profiling data A call graph: Shows the relationships between all of the functions in your application.

constraint_name column [ ASC | DESC ] [ ,...n ]

The floodfill argument fills the inside of the shape that contains the specified point with the current fill color: convert -size 100x100 -stroke red -fill white -draw "rectangle 10,10 90,90" -fill black -draw "color 50,50 floodfill" xc:white output.png This gives you the result shown in Figure 7-50.

The unique name of the constraint to be added. The column or columns that make up the primary key must uniquely identify a single row in the table (no two rows can have the same values for all the specified columns). The ASC (ascending) and DESC (descending) options define the sorting order of the columns within the clustered or nonclustered index.

The call graph shows the calling sequence for the functions in your application, and also shows how much time is spent in each function and any other functions that it calls An annotated source code listing: Shows the number of times each line in the program s source code is executed..

Foreign key constraints establish and enforce relationships between tables and help maintain referential integrity, which means that every value in the foreign key column must exist in the corresponding column for the referenced table. Foreign key constraints also help define domain integrity, in that they define the range of potential and allowed values for a specific column or columns. Domain integrity defines the validity of values in a column. The basic syntax for a foreign key constraint is: CONSTRAINT constraint_name FOREIGN KEY (column_name) REFERENCES [ schema_name.] referenced_table_name [ ( ref_column ) ]

As with gcov, you can add the internal code to your application to produce profiling data by specifying a variety of options. These options tell the GCC compiler to automatically instrument each function so that your application produces profiling data that is automatically written to external files that can be displayed and analyzed by gprof. As you will see later in this section, the profiling options that are automatically available to you when using GCC compilers also enable you to write your own profiling routines. These routines will be inserted in your compiled code, which will be executed at the entry and exit points of each function in the application. This enables you to extend and customize the profiling functionality you get for free with the GCC compiler package. Not a bad deal.