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       llvm-profdata - Profile data tool


       llvm-profdata command [args…]


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


       · merge

       · show


       llvm-profdata merge [options] [filename…]

       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.

       Profiles  passed  in  via  -weighted-input,  -input-files, or via positional arguments are
       processed once for each time they are seen.

       -help  Print a summary of command line options.

       -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.

              Specify  an input file name along with a weight. The profile counts of the supplied
              filename 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.

       -input-files=path, -f=path
              Specify a file which contains a list of files to merge. The entries  in  this  file
              are  newline-separated.  Lines starting with ‘#’ are skipped. Entries may be of the
              form <filename> or <weight>,<filename>.

       -instr (default)
              Specify that the input profile is an instrumentation-based profile.

              Specify that the input profile is a sample-based profile.

              The format of the generated file can be generated in one of three ways:

              -binary (default)

              Emit the profile using a binary encoding.  For  instrumentation-based  profile  the
              output format is the indexed binary format.


              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.


              Emit the profile using GCC’s gcov format (Not yet supported).

              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.

       -num-threads=N, -j=N
              Use  N  threads to perform profile merging. When N=0, llvm-profdata auto-detects an
              appropriate number of threads to use. This is the default.

   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

          llvm-profdata merge -weighted-input=10,foo.profdata -weighted-input=1,bar.profdata -weighted-input=1,baz.profdata -output merged.profdata


       llvm-profdata show [options] [filename]

       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

              Print details for every function.

              Print the counter values for the displayed functions.

              Print details for a function if the function’s name contains the given string.

       -help  Print a summary of command line options.

       -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.

       -instr (default)
              Specify that the input profile is an instrumentation-based profile.

       -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

              Specify that the input profile is a sample-based profile.


       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.


       Maintained by The LLVM Team (


       2003-2018, LLVM Project