Ways to Improve Performance

Profile-Based Optimization

Specifying a Different Program Name (+pgm)

When retrieving a program's profile data from the flow.data file, the linker uses the program's basename as a lookup key. For instance, if a program were compiled as follows, the linker would look for the profile data under the name foobar:

$ cc -v -o foobar +P foo.o bar.o

/usr/ccs/bin/ld /usr/ccs/lib/crt0.o -u main -o foobar \ foo.o bar.o -P -lc

This works fine as long as the name of the program is the same during the instrumentation and optimization phases. But what if the name of the instrumented program is not the same as name of the final optimized program? For example, what if you want the name of the instrumented application to be different from the optimized application, so you use the following compiler commands?

$ cc

-O

+I

-o

prog.inst prog.c

Instrument prog.inst.

$ prog.inst <

input_file1

Profile it, storing the data

$ prog.inst <

input_file2

under the name prog.inst.

Optimize it, but name it prog.opt.

$ cc

+P

-o

prog.opt prog.c

The linker would be unable to find the program name prog.opt in the flow.data file and would issue the error message:

No profile data found for the program prog.opt in flow.data

To get around this problem, the compilers and linker provide the +pgm name option, which allows you to specify a program name to look for in the flow.data file. For instance, to make the above example work properly, you would include +pgm prog.inst on the final compile line:

$ cc +P -o prog.opt +pgm prog.inst prog.c

Like the +df option, the +pgm option is passed directly to the linker.

Selecting an Optimization Level with PBO

When -Pis specified, the code generator and linker perform profile-based optimizations on any I-SOM or regular object files found on the linker command line. In addition, optimizations will be performed according to the optimization level you specified with a compiler option when you instrumented the application. Briefly, the compiler optimization options are:

+O0

Minimal optimization. This is the default.

+O1

Basic block level optimization.

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Kenwood HP 9000 manual Selecting an Optimization Level with PBO, Specifying a Different Program Name +pgm
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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.

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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.

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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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