Ways to Improve Performance

Profile-Based Optimization

Note that you could set SHLIB_FLOW_DATA to flow.data which is the same file as the default setting for FLOW_DATA. But, again, profile data will not be collected from shared libraries unless you explicitly set SHLIB_FLOW_DATA to some output file.

The following is a simple example for instrumenting, profiling, and optimizing a shared library:

$ cc +z

+I -c -O libcode.c

Create I-SOM files.

$ ld -b

-I libcode.o -o mylib.inst.sl

Create instrumented sl.

$ cc main.c mylib.inst.sl

Creat executablea.outile.

$ export SHLIB_FLOW_DATA=./flow.data

Specify output file for

 

profile data

Run instrumented executable

$ a.out

< input_file

$ ld -b

-P +pgm mylib.inst.sl \

with representative input data

Perform PBO.

libcode.o -o mylib.sl

Note that the name used in the database will be the output pathname specified when the instrumented library is linked (mylib.inst.sl in the example above), regardless of how the library might be moved or renamed after it is created.

Using PBO with ld -r

Beginning with the HP-UX 10.0 release, you can take greater advantage of PBO on merged object files created with the -rlinker option.

Briefly, ld -rcombines multiple .o files into a single .o file. It is often used in large product builds to combine objects into more manageable units. It is also often used in combination with the linker -hoption to hide symbols that may conflict with other subsystems in a large application. (See “Hiding Symbols with -h” on page 81 for more information on ld -h.)

In HP-UX 10.0, the subspaces in the merged .o file produced by ld -rare relocatable which allows for greater optimization.

The following is a simple example of using PBO with ld -r:

$ cc +I

-c file1.c file2.c

Create individual I-SOM files

$ ld -r

-I -o reloc.o file1.o file2.o Build relocatable, merged file.

$ cc +I

-o a.out reloc.o

Create instrumented executable file.

$ a.out

< input_file

Run instrumented executable with

 

 

representative input data.

$ ld -r

-P +pgm a.out -o reloc.o \

file1.o file2.o

Rebuild relocatable file for PBO.

$ cc +P

-o a.out reloc.o

Perform PBO on the final executable file.

Chapter 8

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Kenwood HP 9000 manual Using PBO with ld -r
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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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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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