:program:`llvm-profdata` command [args...]
The :program:`llvm-profdata` tool is a small utility for working with profile data files.
.. program:: llvm-profdata merge
:program:`llvm-profdata merge` [options] [filename...]
:program:`llvm-profdata merge` takes several profile data files generated by PGO instrumentation and merges them together into a single indexed profile data file.
By default profile data is merged without modification. This means that the
relative importance of each input file is proportional to the number of samples
or counts it contains. In general, the input from a longer training run will be
interpreted as relatively more important than a shorter run. Depending on the
nature of the training runs it may be useful to adjust the weight given to each
input file by using the -weighted-input option.
.. option:: -help Print a summary of command line options.
.. option:: -output=output, -o=output Specify the output file name. *Output* cannot be ``-`` as the resulting indexed profile data can't be written to standard output.
.. option:: -weighted-input=weight,filename Specify an input file name along with a weight. The profile counts of the input file will be scaled (multiplied) by the supplied ``weight``, where where ``weight`` is a decimal integer >= 1. Input files specified without using this option are assigned a default weight of 1. Examples are shown below.
.. option:: -instr (default) Specify that the input profile is an instrumentation-based profile.
.. option:: -sample Specify that the input profile is a sample-based profile. The format of the generated file can be generated in one of three ways: .. option:: -binary (default) Emit the profile using a binary encoding. For instrumentation-based profile the output format is the indexed binary format. .. option:: -text Emit the profile in text mode. This option can also be used with both sample-based and instrumentation-based profile. When this option is used the profile will be dumped in the text format that is parsable by the profile reader. .. option:: -gcc Emit the profile using GCC's gcov format (Not yet supported). .. option:: -sparse[=true|false] Do not emit function records with 0 execution count. Can only be used in conjunction with -instr. Defaults to false, since it can inhibit compiler optimization during PGO.
Merge three profiles:
llvm-profdata merge foo.profdata bar.profdata baz.profdata -output merged.profdata
The input file foo.profdata is especially important, multiply its counts by 10:
llvm-profdata merge -weighted-input=10,foo.profdata bar.profdata baz.profdata -output merged.profdata
Exactly equivalent to the previous invocation (explicit form; useful for programmatic invocation):
llvm-profdata merge -weighted-input=10,foo.profdata -weighted-input=1,bar.profdata -weighted-input=1,baz.profdata -output merged.profdata
.. program:: llvm-profdata show
:program:`llvm-profdata show` [options] [filename]
:program:`llvm-profdata show` takes a profile data file and displays the information about the profile counters for this file and for any of the specified function(s).
If filename is omitted or is -, then llvm-profdata show reads its
input from standard input.
.. option:: -all-functions Print details for every function.
.. option:: -counts Print the counter values for the displayed functions.
.. option:: -function=string Print details for a function if the function's name contains the given string.
.. option:: -help Print a summary of command line options.
.. option:: -output=output, -o=output Specify the output file name. If *output* is ``-`` or it isn't specified, then the output is sent to standard output.
.. option:: -instr (default) Specify that the input profile is an instrumentation-based profile.
.. option:: -text Instruct the profile dumper to show profile counts in the text format of the instrumentation-based profile data representation. By default, the profile information is dumped in a more human readable form (also in text) with annotations.
.. option:: -sample Specify that the input profile is a sample-based profile.
:program:`llvm-profdata` returns 1 if the command is omitted or is invalid, if it cannot read input files, or if there is a mismatch between their data.