1LLVM-PROFDATA(1) LLVM LLVM-PROFDATA(1)
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6 llvm-profdata - Profile data tool
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9 llvm-profdata command [args...]
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12 The llvm-profdata tool is a small utility for working with profile data
13 files.
14
16 · merge
17 · show
19
21 SYNOPSIS
22 llvm-profdata merge [options] [filename...]
23 DESCRIPTION
25 llvm-profdata merge takes several profile data files generated by PGO
26 instrumentation and merges them together into a single indexed profile
27 data file.
28 By default profile data is merged without modification. This means that
30 the relative importance of each input file is proportional to the num‐
31 ber of samples or counts it contains. In general, the input from a
32 longer training run will be interpreted as relatively more important
33 than a shorter run. Depending on the nature of the training runs it may
34 be useful to adjust the weight given to each input file by using the
35 -weighted-input option.
36 Profiles passed in via -weighted-input, -input-files, or via positional
38 arguments are processed once for each time they are seen.
39 OPTIONS
41 -help Print a summary of command line options.
42 -output=output, -o=output
44 Specify the output file name. Output cannot be - as the result‐
45 ing indexed profile data can't be written to standard output.
46 -weighted-input=weight,filename
48 Specify an input file name along with a weight. The profile
49 counts of the supplied filename will be scaled (multiplied) by
50 the supplied weight, where where weight is a decimal integer >=
51 1. Input files specified without using this option are assigned
52 a default weight of 1. Examples are shown below.
53 -input-files=path, -f=path
55 Specify a file which contains a list of files to merge. The
56 entries in this file are newline-separated. Lines starting with
57 '#' are skipped. Entries may be of the form <filename> or
58 <weight>,<filename>.
59 -instr (default)
61 Specify that the input profile is an instrumentation-based pro‐
62 file.
63 -sample
65 Specify that the input profile is a sample-based profile.
66 The format of the generated file can be generated in one of
68 three ways:
69 -binary (default)
71 Emit the profile using a binary encoding. For instrumenta‐
73 tion-based profile the output format is the indexed binary for‐
74 mat.
75 -text
77 Emit the profile in text mode. This option can also be used with
79 both sample-based and instrumentation-based profile. When this
80 option is used the profile will be dumped in the text format
81 that is parsable by the profile reader.
82 -gcc
84 Emit the profile using GCC's gcov format (Not yet supported).
86 -sparse[=true|false]
88 Do not emit function records with 0 execution count. Can only be
89 used in conjunction with -instr. Defaults to false, since it can
90 inhibit compiler optimization during PGO.
91 -num-threads=N, -j=N
93 Use N threads to perform profile merging. When N=0, llvm-prof‐
94 data auto-detects an appropriate number of threads to use. This
95 is the default.
96 EXAMPLES
98 Basic Usage
99 Merge three profiles:
100 llvm-profdata merge foo.profdata bar.profdata baz.profdata -output merged.profdata
102 Weighted Input
104 The input file foo.profdata is especially important, multiply its
105 counts by 10:
106 llvm-profdata merge -weighted-input=10,foo.profdata bar.profdata baz.profdata -output merged.profdata
108 Exactly equivalent to the previous invocation (explicit form; useful
110 for programmatic invocation):
111 llvm-profdata merge -weighted-input=10,foo.profdata -weighted-input=1,bar.profdata -weighted-input=1,baz.profdata -output merged.profdata
113
115 SYNOPSIS
116 llvm-profdata show [options] [filename]
117 DESCRIPTION
119 llvm-profdata show takes a profile data file and displays the informa‐
120 tion about the profile counters for this file and for any of the speci‐
121 fied function(s).
122 If filename is omitted or is -, then llvm-profdata show reads its input
124 from standard input.
125 OPTIONS
127 -all-functions
128 Print details for every function.
129 -counts
131 Print the counter values for the displayed functions.
132 -function=string
134 Print details for a function if the function's name contains the
135 given string.
136 -help Print a summary of command line options.
138 -output=output, -o=output
140 Specify the output file name. If output is - or it isn't speci‐
141 fied, then the output is sent to standard output.
142 -instr (default)
144 Specify that the input profile is an instrumentation-based pro‐
145 file.
146 -text Instruct the profile dumper to show profile counts in the text
148 format of the instrumentation-based profile data representation.
149 By default, the profile information is dumped in a more human
150 readable form (also in text) with annotations.
151 -topn=n
153 Instruct the profile dumper to show the top n functions with the
154 hottest basic blocks in the summary section. By default, the
155 topn functions are not dumped.
156 -sample
158 Specify that the input profile is a sample-based profile.
159 -memop-sizes
161 Show the profiled sizes of the memory intrinsic calls for shown
162 functions.
163
165 llvm-profdata returns 1 if the command is omitted or is invalid, if it
166 cannot read input files, or if there is a mismatch between their data.
167
169 Maintained by The LLVM Team (http://llvm.org/).
170
172 2003-2020, LLVM Project
1737 2020-08-01 LLVM-PROFDATA(1)