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feedback(1) General Commands Manual feedback(1) NAME feedback - Generate an optimization feedback file using pixie and prof SYNOPSIS feedback [ prof-options ] [ -o feedback-file ] [ -v ] objfile [ obj- file-arguments ] FLAGS The feedback command accepts the following prof(1) options and any un- ambiguous abbreviations: -asm, -clock megahertz, -{e|E}xclude proce- dure_name, -feedback filename, -heavy, -invocations, -lines, -merge filename, -numbers, -{o|O}nly procedure_name, -procedures, -quit n, -testcoverage, -truecycles [0,1,2], -zero. The feedback command ignores all other options in order to pro- vide compatiblility with older versions of the feedback command. An option argument following an option not recognized by this or older versions of the feedback command will be treated as the objfile argument. Specifies the name of the feedback file. This can also be specified by the -feedback option of prof. You should use only one of these options to specify a feedback file, not both. Causes the pixie, application, and prof commands to be printed as they are invoked. PARAMETERS Specifies the executable of the application for which a feedback file is to be generated. A pixie-instrumented version of this executable will be executed with the current working directory and environment variables. The feedback file that is generated will reflect the behav- ior of one execution of the instrumented objfile. Specify the argu- ments that will cause the behavior that you want to have optimized when the compiler uses the feedback file. DESCRIPTION The feedback command invokes pixie to add profiling code to an object file. The object file generated by pixie is executed to obtain profil- ing information. The feedback command then invokes prof to analyze the profiling information. If the output of objfile needs to be redirected, but not the output of the feedback utility, the redirection characters need to have sh(1) syntax and be within quotes. If objfile is multi-threaded, the LD_LI- BRARY_PATH environment variable needs to include the current working directory. EXAMPLES Send the profiling information to the standard output: $ feedback myprog Write a binary formatted performance profile to the file myprog.feedback, which then helps a subsequent re- compilation optimize the program: $ feedback -feedback myprog.feedback myprog $ cc -O -feedback myprog.feedback -o myprog myprog.c FILES Object with profiling code. Generated by pixie. Basic block addresses. Generated by pixie. Basic block counts. Generated by myprog.pixie. Note: Run pixie and prof independently if alternative names are needed. RELATED INFORMATION cc(1), pixie(5), prof(1) delim off feedback(1)