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Rong Xu
bf0230910c
In LTO or Thin-lto mode (though linker plugin), the module names are of temp file names which are different for different compilations. Using SourceFileName avoids the issue. This should not change any functionality for current PGO as all the current callers of getPGOFuncName() is before LTO. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350579 91177308-0d34-0410-b5e6-96231b3b80d8
234 lines
6.3 KiB
ReStructuredText
234 lines
6.3 KiB
ReStructuredText
llvm-profdata - Profile data tool
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=================================
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SYNOPSIS
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--------
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:program:`llvm-profdata` *command* [*args...*]
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DESCRIPTION
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-----------
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The :program:`llvm-profdata` tool is a small utility for working with profile
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data files.
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COMMANDS
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--------
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* :ref:`merge <profdata-merge>`
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* :ref:`show <profdata-show>`
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.. program:: llvm-profdata merge
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.. _profdata-merge:
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MERGE
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-----
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SYNOPSIS
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^^^^^^^^
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:program:`llvm-profdata merge` [*options*] [*filename...*]
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DESCRIPTION
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^^^^^^^^^^^
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:program:`llvm-profdata merge` takes several profile data files
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generated by PGO instrumentation and merges them together into a single
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indexed profile data file.
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By default profile data is merged without modification. This means that the
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relative importance of each input file is proportional to the number of samples
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or counts it contains. In general, the input from a longer training run will be
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interpreted as relatively more important than a shorter run. Depending on the
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nature of the training runs it may be useful to adjust the weight given to each
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input file by using the ``-weighted-input`` option.
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Profiles passed in via ``-weighted-input``, ``-input-files``, or via positional
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arguments are processed once for each time they are seen.
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OPTIONS
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^^^^^^^
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.. option:: -help
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Print a summary of command line options.
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.. option:: -output=output, -o=output
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Specify the output file name. *Output* cannot be ``-`` as the resulting
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indexed profile data can't be written to standard output.
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.. option:: -weighted-input=weight,filename
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Specify an input file name along with a weight. The profile counts of the
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supplied ``filename`` will be scaled (multiplied) by the supplied
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``weight``, where where ``weight`` is a decimal integer >= 1.
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Input files specified without using this option are assigned a default
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weight of 1. Examples are shown below.
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.. option:: -input-files=path, -f=path
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Specify a file which contains a list of files to merge. The entries in this
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file are newline-separated. Lines starting with '#' are skipped. Entries may
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be of the form <filename> or <weight>,<filename>.
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.. option:: -remapping-file=path, -r=path
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Specify a file which contains a remapping from symbol names in the input
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profile to the symbol names that should be used in the output profile. The
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file should consist of lines of the form ``<input-symbol> <output-symbol>``.
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Blank lines and lines starting with ``#`` are skipped.
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The :doc:`llvm-cxxmap <llvm-cxxmap>` tool can be used to generate the symbol
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remapping file.
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.. option:: -instr (default)
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Specify that the input profile is an instrumentation-based profile.
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.. option:: -sample
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Specify that the input profile is a sample-based profile.
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The format of the generated file can be generated in one of three ways:
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.. option:: -binary (default)
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Emit the profile using a binary encoding. For instrumentation-based profile
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the output format is the indexed binary format.
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.. option:: -text
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Emit the profile in text mode. This option can also be used with both
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sample-based and instrumentation-based profile. When this option is used
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the profile will be dumped in the text format that is parsable by the profile
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reader.
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.. option:: -gcc
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Emit the profile using GCC's gcov format (Not yet supported).
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.. option:: -sparse[=true|false]
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Do not emit function records with 0 execution count. Can only be used in
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conjunction with -instr. Defaults to false, since it can inhibit compiler
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optimization during PGO.
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.. option:: -num-threads=N, -j=N
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Use N threads to perform profile merging. When N=0, llvm-profdata auto-detects
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an appropriate number of threads to use. This is the default.
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EXAMPLES
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^^^^^^^^
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Basic Usage
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+++++++++++
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Merge three profiles:
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::
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llvm-profdata merge foo.profdata bar.profdata baz.profdata -output merged.profdata
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Weighted Input
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++++++++++++++
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The input file `foo.profdata` is especially important, multiply its counts by 10:
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::
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llvm-profdata merge -weighted-input=10,foo.profdata bar.profdata baz.profdata -output merged.profdata
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Exactly equivalent to the previous invocation (explicit form; useful for programmatic invocation):
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::
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llvm-profdata merge -weighted-input=10,foo.profdata -weighted-input=1,bar.profdata -weighted-input=1,baz.profdata -output merged.profdata
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.. program:: llvm-profdata show
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.. _profdata-show:
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SHOW
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----
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SYNOPSIS
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^^^^^^^^
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:program:`llvm-profdata show` [*options*] [*filename*]
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DESCRIPTION
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^^^^^^^^^^^
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:program:`llvm-profdata show` takes a profile data file and displays the
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information about the profile counters for this file and
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for any of the specified function(s).
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If *filename* is omitted or is ``-``, then **llvm-profdata show** reads its
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input from standard input.
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OPTIONS
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^^^^^^^
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.. option:: -all-functions
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Print details for every function.
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.. option:: -counts
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Print the counter values for the displayed functions.
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.. option:: -function=string
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Print details for a function if the function's name contains the given string.
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.. option:: -help
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Print a summary of command line options.
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.. option:: -output=output, -o=output
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Specify the output file name. If *output* is ``-`` or it isn't specified,
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then the output is sent to standard output.
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.. option:: -instr (default)
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Specify that the input profile is an instrumentation-based profile.
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.. option:: -text
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Instruct the profile dumper to show profile counts in the text format of the
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instrumentation-based profile data representation. By default, the profile
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information is dumped in a more human readable form (also in text) with
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annotations.
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.. option:: -topn=n
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Instruct the profile dumper to show the top ``n`` functions with the
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hottest basic blocks in the summary section. By default, the topn functions
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are not dumped.
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.. option:: -sample
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Specify that the input profile is a sample-based profile.
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.. option:: -memop-sizes
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Show the profiled sizes of the memory intrinsic calls for shown functions.
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.. option:: -value-cutoff=n
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Show only those functions whose max count values are greater or equal to ``n``.
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By default, the value-cutoff is set to 0.
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.. option:: -list-below-cutoff
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Only output names of functions whose max count value are below the cutoff
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value.
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EXIT STATUS
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-----------
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:program:`llvm-profdata` returns 1 if the command is omitted or is invalid,
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if it cannot read input files, or if there is a mismatch between their data.
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