Ways to Improve Performance

Profile-Based Optimization

Instrumenting (+I/-I)

Although you can use the linker alone to perform PBO, the best optimizations result if you use the compiler as well; this section describes this approach.

To instrument an application (with C, C++, and FORTRAN), compile the source with the +I compiler command line option. This causes the compiler to generate a .o file containing intermediate code, rather than the usual object code. (Intermediate code is a representation of your code that is lower-level than the source code, but higher level than the object code.) A file containing such intermediate code is referred to as an I-SOMfile.

After creating an I-SOM file for each source file, the compiler invokes the linker as follows:

1.In 32-bit mode, instead of using the startup file /usr/ccs/lib/crt0.o, the compiler specifies a special startup file named /opt/langtools/lib/icrt0.o. When building a shared library, the compiler uses /usr/ccs/lib/scrt0.o. In 64-bit mode, the linker automatically adds

/usr.css/lib/pa20_64/fdp_init.o or

/usr.css/lib/pa20_64/fdp_init_sl.o to the link when detects that -I crt0.o is not changed.

2.The compiler passes the -Ioption to the linker, causing it to place instrumentation code in the resulting executable.

You can see how the compiler invokes the linker by specifying the -voption. For example, to instrument the file sample.c, to name the executable sample.inst, to perform level 2 optimizations (the compiler option -Ois equivalent to +O2), and to see verbose output (-v):

$ cc -v -o sample.inst +I -O sample.c /opt/langtools/lbin/cpp sample.c /var/tmp/ctm123 /opt/ansic/lbin/ccom /var/tmp/ctm123 sample.o -O2-I /usr/ccs/bin/ld /opt/langtools/lib/icrt0.o-u main -o \

sample.inst sample.o -I -lc

Notice in the linker command line (starting with /usr/ccs/bin/ld), the application is linked with /opt/langtools/lib/icrt0.o and the -Ioption is given.

To save the profile data to a file other than flow.data in the current working directory, use the FLOW_DATA environment variable as described in “Specifying a Different flow.data with FLOW_DATA”.

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Kenwood HP 9000 manual Instrumenting +I/-I
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HP 9000 specifications

The Kenwood HP 9000 is a cutting-edge home appliance designed for culinary enthusiasts seeking to elevate their cooking experience. This powerful kitchen machine stands out for its multi-functionality, combining the roles of a food processor, blender, and mixer into one sleek unit.

One of the flagship features of the Kenwood HP 9000 is its robust motor, which delivers exceptional performance across various tasks. With a powerful motor that operates at multiple speeds, users can tackle everything from kneading dough to finely chopping vegetables with ease. The variable speed control allows for precision, ensuring that every ingredient is processed to perfection according to individual preferences.

The HP 9000 comes equipped with a variety of attachments that enhance its versatility. Among these are a stainless-steel mixing bowl, a dough hook, a whisk, and multiple cutting blades. This extensive array of accessories means that users can whip up delightful pastries, create homemade pasta, or prepare smoothies with minimal hassle. Each attachment is designed for easy attachment and removal, making the transition between tasks seamless and efficient.

Another key characteristic of the Kenwood HP 9000 is its advanced safety features. The design incorporates mechanisms that prevent the machine from operating unless all components are securely in place. This not only gives users peace of mind while cooking but also ensures longevity for the appliance, reducing the risk of wear and tear over time.

In terms of design, the HP 9000 is both modern and aesthetically pleasing. Its ergonomic shape and compact size make it easy to store and use in various kitchen settings, while the high-quality materials used in its construction guarantee durability and longevity. The user interface is intuitive, with clearly labeled buttons that facilitate operation, ensuring that even novice cooks can navigate the machine effortlessly.

Additionally, the Kenwood HP 9000 features innovative technologies, such as an integrated digital timer and a pulse function for added control during food preparation. These features enhance cooking precision, allowing users to achieve consistent results every time.

In summary, the Kenwood HP 9000 is an exceptional kitchen appliance that combines power, versatility, and safety. With its advanced features and user-friendly design, it is an ideal choice for anyone looking to simplify their cooking process while achieving professional-level results. Whether you're whipping up a quick meal or tackling an elaborate recipe, the HP 9000 is a reliable companion that will inspire culinary creativity.
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