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78dfceef4b
Add a "-j" option to llvm-profdata to control the number of threads used.
Auto-detect NumThreads when it isn't specified, and avoid spawning threads when
they wouldn't be beneficial.
I tested this patch using a raw profile produced by clang (147MB). Here is the
time taken to merge 4 copies together on my laptop:
No thread pool: 112.87s user 5.92s system 97% cpu 2:01.08 total
With 2 threads: 134.99s user 26.54s system 164% cpu 1:33.31 total
Changes since the initial commit:
- When handling odd-length inputs, call ThreadPool::wait() before merging the
last profile. Should fix a race/off-by-one (see r275937).
Differential Revision: https://reviews.llvm.org/D22438
llvm-svn: 275938
204 lines
5.3 KiB
ReStructuredText
204 lines
5.3 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:: -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:: -sample
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Specify that the input profile is a sample-based profile.
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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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