385 lines
12 KiB
ReStructuredText
385 lines
12 KiB
ReStructuredText
llvm-profdata - Profile data tool
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=================================
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.. program:: llvm-profdata
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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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* :ref:`overlap <profdata-overlap>`
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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
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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 ``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
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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
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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:: --extbinary
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Emit the profile using an extensible binary encoding. This option can only
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be used with sample-based profile. The extensible binary encoding can be
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more compact with compression enabled and can be loaded faster than the
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default binary encoding.
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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
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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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.. option:: --failure-mode=[any|all]
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Set the failure mode. There are two options: 'any' causes the merge command to
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fail if any profiles are invalid, and 'all' causes the merge command to fail
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only if all profiles are invalid. If 'all' is set, information from any
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invalid profiles is excluded from the final merged product. The default
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failure mode is 'any'.
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.. option:: --prof-sym-list=<path>
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Specify a file which contains a list of symbols to generate profile symbol
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list in the profile. This option can only be used with sample-based profile
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in extbinary format. The entries in this file are newline-separated.
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.. option:: --compress-all-sections=[true|false]
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Compress all sections when writing the profile. This option can only be used
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with sample-based profile in extbinary format.
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.. option:: --use-md5=[true|false]
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Use MD5 to represent string in name table when writing the profile.
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This option can only be used with sample-based profile in extbinary format.
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.. option:: --gen-partial-profile=[true|false]
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Mark the profile to be a partial profile which only provides partial profile
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coverage for the optimized target. This option can only be used with
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sample-based profile in extbinary format.
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.. option:: --supplement-instr-with-sample=<file>
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Supplement an instrumentation profile with sample profile. The sample profile
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is the input of the flag. Output will be in instrumentation format (only works
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with -instr).
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.. option:: --zero-counter-threshold=<float>
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For the function which is cold in instr profile but hot in sample profile, if
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the ratio of the number of zero counters divided by the the total number of
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counters is above the threshold, the profile of the function will be regarded
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as being harmful for performance and will be dropped.
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.. option:: --instr-prof-cold-threshold=<int>
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User specified cold threshold for instr profile which will override the cold
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threshold got from profile summary.
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.. option:: --suppl-min-size-threshold=<int>
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If the size of a function is smaller than the threshold, assume it can be
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inlined by PGO early inliner and it will not be adjusted based on sample
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profile.
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.. option:: --debug-info=<path>
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Specify the executable or ``.dSYM`` that contains debug info for the raw profile.
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When ``-debug-info-correlate`` was used for instrumentation, use this option
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to correlate the raw profile.
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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
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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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.. option:: --showcs
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Only show context sensitive profile counts. The default is to filter all
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context sensitive profile counts.
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.. option:: --show-prof-sym-list=[true|false]
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Show profile symbol list if it exists in the profile. This option is only
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meaningful for sample-based profile in extbinary format.
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.. option:: --show-sec-info-only=[true|false]
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Show basic information about each section in the profile. This option is
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only meaningful for sample-based profile in extbinary format.
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.. program:: llvm-profdata overlap
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.. _profdata-overlap:
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OVERLAP
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-------
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SYNOPSIS
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^^^^^^^^
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:program:`llvm-profdata overlap` [*options*] [*base profile file*] [*test profile file*]
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DESCRIPTION
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^^^^^^^^^^^
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:program:`llvm-profdata overlap` takes two profile data files and displays the
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*overlap* of counter distribution between the whole files and between any of the
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specified functions.
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In this command, *overlap* is defined as follows:
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Suppose *base profile file* has the following counts:
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{c1_1, c1_2, ..., c1_n, c1_u_1, c2_u_2, ..., c2_u_s},
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and *test profile file* has
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{c2_1, c2_2, ..., c2_n, c2_v_1, c2_v_2, ..., c2_v_t}.
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Here c{1|2}_i (i = 1 .. n) are matched counters and c1_u_i (i = 1 .. s) and
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c2_v_i (i = 1 .. v) are unmatched counters (or counters only existing in)
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*base profile file* and *test profile file*, respectively.
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Let sum_1 = c1_1 + c1_2 + ... + c1_n + c1_u_1 + c2_u_2 + ... + c2_u_s, and
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sum_2 = c2_1 + c2_2 + ... + c2_n + c2_v_1 + c2_v_2 + ... + c2_v_t.
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*overlap* = min(c1_1/sum_1, c2_1/sum_2) + min(c1_2/sum_1, c2_2/sum_2) + ...
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+ min(c1_n/sum_1, c2_n/sum_2).
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The result overlap distribution is a percentage number, ranging from 0.0% to
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100.0%, where 0.0% means there is no overlap and 100.0% means a perfect
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overlap.
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Here is an example, if *base profile file* has counts of {400, 600}, and
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*test profile file* has matched counts of {60000, 40000}. The *overlap* is 80%.
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OPTIONS
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^^^^^^^
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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
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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:: --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 max of unsigned long long.
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.. option:: --cs
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Only show overlap for the context sensitive profile counts. The default is to show
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non-context sensitive profile counts.
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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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