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Usage: fib_cmdline num-of-sequence-values-to-print Running it with the command-line argument 8 displays the first eight values in the Fibonacci sequence: $ ./fib_cmdline 8 0 1 1 2 3 5 8 13 Note that the output of the program is still Fortran style, with one output statement per line. This is still pretty darn close to the C version used elsewhere in this book. The extensions used in this code are available during compilation because code compiled by gfortran allows the use of built-in extensions by default. This is known as conforming to the GNU Fortran standard, and even has its own command-line option, -std=gnu, which is active by default. gfortran supports its own GNU standard, and also supports the Fortran 95 standard, since gfortran is designed as a Fortran 95 compiler. To see what happens when trying to compile this code as standard Fortran 95 code, try using the -pedantic and -std=f95 options, which report violations of the Fortran 95 standard and the use of extensions, as in the following example: $ gfortran -o fib_cmdline fib_cmdline.f -pedantic -std=f95 /tmp/ccMQpqLo.o(.text+0x18): In function 'MAIN__': fib_cmdline.f: undefined reference to 'iargc_' /tmp/ccMQpqLo.o(.text+0x38):fib_cmdline.f: undefined reference to 'getarg_' collect2: ld returned 1 exit status This output identifies the iargc() and getarg() functions as not being part of the Fortran 95 standard. However, extensions such as these have been part of Fortran for quite a while, beginning with FORTRAN 77, and are detailed in each Fortran specification. gfortran actually provides a rich set of usable extensions that can significantly simplify Fortran development, especially the mathematical or scientific code for which Fortran is famous. For more information about the extensions to Fortran 95 that are provided by gfortran, see the later section titled gfortran Intrinsics and Extensions.

Keep your options open and feel free to experiment (in a test environment, of course) Ask questions and don t accept conventional wisdom at face value..

gfortran provides a rich set of command-line options. These options can be generally grouped into five different classes: Code generation: The type and characteristics of the output of compiling or preprocessing your Fortran programs (code generation) including warning messages Debugging: Options that can help in debugging your Fortran applications Directory search: Options that control the directories searched for precompiled subroutines or libraries Fortran dialect: The characteristics of the Fortran program you are compiling and the Fortran standard to which it conforms Warnings: The type and severity of warning messages that can be produced when using gfortran The following sections discuss each of the classes of command-line options in detail.

Negating a pixel is the process of inverting its value. ImageMagick can negate images with the negate command-line option. This is similar to the solarize option presented in 5 except that no threshold is applied to the decision to negate a given pixel. For this example, I ll show how to negate the picture shown in Figure 6-20.

In this next set of recipes, I ll demonstrate how to capture and evaluate query performance. This book has focused almost entirely on SQL Server 2005 s flavor of Transact-SQL, and hasn t touched on the various graphical interface tools much. I ll be breaking with this tradition in this chapter to briefly show you how to use SQL Profiler to capture query activity. Also, I ll demonstrate how to graphically display the actual or estimated execution plan of a query so that you can understand the decisions that SQL Server is making in order to generate the query result set. I ll also demonstrate several other Transact-SQL commands, which can be used to return detailed information about the query execution plan.

This section describes options that control gfortran code generation. Most of them have both positive and negative forms, such as -funderscoring and -fno-underscoring.

There are usually two branches of query performance tuning: proactive and reactive. Proactive query tuning usually occurs during development. You design the database, populate it with data, and then start building queries. You build the queries based on application and end-user requirements. For those queries that don t perform well, you can tune them before deploying out in the stored procedure or to the application developer. Reactive performance involves capturing poor performance after the code has already been deployed to production. Data changes over time, and so does the effectiveness of indexes and the queries that use them. Queries that once performed well may execute longer than they did originally. You may hear complaints from end-users, or you might actually seek out poorly performing queries yourself. One of the most valuable graphical interface tools in the SQL Server 2005 toolset is SQL Server Profiler. With SQL Server Profiler, you can monitor query activity as it occurs against your SQL

The options listed in this section are the default settings for gfortran, which means that these options are invoked unless explicitly disabled, even if they are not physically specified on the gfortran command line.

Server instance. There are many potential uses for this tool, but this recipe specifically demonstrates how to use SQL Server Profiler to capture high duration queries. In this recipe, SQL Server Profiler is launched and configured to capture high duration queries. Then, a query is executed in SQL Server Management Studio that will be captured in SQL Server Profiler: 1. The recipe begins by going to Start, Programs Microsoft SQL Server 2005 Performance Tools SQL Server Profiler. 2. Once in SQL Server Profiler, go to File New Trace. This brings up the Connect to Server dialog box (see Figure 28-1). It is here that you select the name of the SQL Server instance to connect to, and the authentication method (either Windows or SQL). When you re finished designating these values, click the Connect button.