Ways to Improve Performance

Profile-Based Optimization

Using The flow.data File

By default, the code generator and linker look for the flow.data file in the current working directory. In other words, the flow.data file created during the profiling phase should be located in the directory where you relink the program.

Specifying a Different flow.data File with +df

What if you want to use a flow.data file from a different directory than where you are linking? Or what if you have renamed the flow.data file

—for example, if you have multiple flow.data files created for different input sets? The +df option allows you to override the default +P behavior of using the file flow.data in the current directory. The compiler passes this option directly to the linker.

For example, suppose after collecting profile data, you decide to rename flow.data to prog.prf. You could then use the +df option as follows:

$ cc -v -o prog +P +df prog.prf prog.o /usr/ccs/bin/ld /usr/ccs/lib/crt0.o -u main -o prog \

+df prog.prf prog.o -P -lc

The +df option overrides the effects of the FLOW_DATA environment variable.

Specifying a Different flow.data with FLOW_DATA

The FLOW_DATA environment variable provides another way to override the default flow.data file name and location. If set, this variable defines an alternate file name for the profile data file.

For example, to use the file /home/adam/projX/prog.data instead of flow.data, set FLOW_DATA:

$ FLOW_DATA=/home/adam/projX/prog.data

Bourne and Korn shell

$ export FLOW_DATA

 

$ setenv FLOW_DATA

/home/adam/projX/prog.data

C shell

Interaction between FLOW_DATA and +df

If an application is linked with +df and -P, the FLOW_DATA environment variable is ignored. In other words, +df overrides the effects of FLOW_DATA.

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HP 9000 specifications

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