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llvm-profdata - Profile data tool

SYNOPSIS

:program:`llvm-profdata` command [args...]

DESCRIPTION

The :program:`llvm-profdata` tool is a small utility for working with profile data files.

COMMANDS

.. program:: llvm-profdata merge

MERGE

SYNOPSIS

:program:`llvm-profdata merge` [options] [filename...]

DESCRIPTION

: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.

OPTIONS

.. 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.

EXAMPLES

Basic Usage

Merge three profiles:

llvm-profdata merge foo.profdata bar.profdata baz.profdata -output merged.profdata

Weighted Input

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

SHOW

SYNOPSIS

:program:`llvm-profdata show` [options] [filename]

DESCRIPTION

: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.

OPTIONS

.. 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.

EXIT STATUS

: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.