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 • overlap
21
23 SYNOPSIS
24 llvm-profdata merge [options] [filename...]
25 DESCRIPTION
27 llvm-profdata merge takes several profile data files generated by PGO
28 instrumentation and merges them together into a single indexed profile
29 data file.
30 By default profile data is merged without modification. This means that
32 the relative importance of each input file is proportional to the num‐
33 ber of samples or counts it contains. In general, the input from a
34 longer training run will be interpreted as relatively more important
35 than a shorter run. Depending on the nature of the training runs it may
36 be useful to adjust the weight given to each input file by using the
37 -weighted-input option.
38 Profiles passed in via -weighted-input, -input-files, or via positional
40 arguments are processed once for each time they are seen.
41 OPTIONS
43 -help Print a summary of command line options.
44 -output=output, -o=output
46 Specify the output file name. Output cannot be - as the result‐
47 ing indexed profile data can't be written to standard output.
48 -weighted-input=weight,filename
50 Specify an input file name along with a weight. The profile
51 counts of the supplied filename will be scaled (multiplied) by
52 the supplied weight, where weight is a decimal integer >= 1.
53 Input files specified without using this option are assigned a
54 default weight of 1. Examples are shown below.
55 -input-files=path, -f=path
57 Specify a file which contains a list of files to merge. The en‐
58 tries in this file are newline-separated. Lines starting with
59 '#' are skipped. Entries may be of the form <filename> or
60 <weight>,<filename>.
61 -remapping-file=path, -r=path
63 Specify a file which contains a remapping from symbol names in
64 the input profile to the symbol names that should be used in the
65 output profile. The file should consist of lines of the form
66 <input-symbol> <output-symbol>. Blank lines and lines starting
67 with # are skipped.
68 The llvm-cxxmap tool can be used to generate the symbol remap‐
70 ping file.
71 -instr (default)
73 Specify that the input profile is an instrumentation-based pro‐
74 file.
75 -sample
77 Specify that the input profile is a sample-based profile.
78 The format of the generated file can be generated in one of
80 three ways:
81 -binary (default)
83 Emit the profile using a binary encoding. For instrumenta‐
85 tion-based profile the output format is the indexed binary for‐
86 mat.
87 -extbinary
89 Emit the profile using an extensible binary encoding. This op‐
91 tion can only be used with sample-based profile. The extensible
92 binary encoding can be more compact with compression enabled and
93 can be loaded faster than the default binary encoding.
94 -text
96 Emit the profile in text mode. This option can also be used with
98 both sample-based and instrumentation-based profile. When this
99 option is used the profile will be dumped in the text format
100 that is parsable by the profile reader.
101 -gcc
103 Emit the profile using GCC's gcov format (Not yet supported).
105 -sparse[=true|false]
107 Do not emit function records with 0 execution count. Can only be
108 used in conjunction with -instr. Defaults to false, since it can
109 inhibit compiler optimization during PGO.
110 -num-threads=N, -j=N
112 Use N threads to perform profile merging. When N=0, llvm-prof‐
113 data auto-detects an appropriate number of threads to use. This
114 is the default.
115 -failure-mode=[any|all]
117 Set the failure mode. There are two options: 'any' causes the
118 merge command to fail if any profiles are invalid, and 'all'
119 causes the merge command to fail only if all profiles are in‐
120 valid. If 'all' is set, information from any invalid profiles is
121 excluded from the final merged product. The default failure mode
122 is 'any'.
123 -prof-sym-list=path
125 Specify a file which contains a list of symbols to generate pro‐
126 file symbol list in the profile. This option can only be used
127 with sample-based profile in extbinary format. The entries in
128 this file are newline-separated.
129 -compress-all-sections=[true|false]
131 Compress all sections when writing the profile. This option can
132 only be used with sample-based profile in extbinary format.
133 -use-md5=[true|false]
135 Use MD5 to represent string in name table when writing the pro‐
136 file. This option can only be used with sample-based profile in
137 extbinary format.
138 -gen-partial-profile=[true|false]
140 Mark the profile to be a partial profile which only provides
141 partial profile coverage for the optimized target. This option
142 can only be used with sample-based profile in extbinary format.
143 -supplement-instr-with-sample=path_to_sample_profile
145 Supplement an instrumentation profile with sample profile. The
146 sample profile is the input of the flag. Output will be in in‐
147 strumentation format (only works with -instr).
148 -zero-counter-threshold=threshold_float_number
150 For the function which is cold in instr profile but hot in sam‐
151 ple profile, if the ratio of the number of zero counters divided
152 by the the total number of counters is above the threshold, the
153 profile of the function will be regarded as being harmful for
154 performance and will be dropped.
155 -instr-prof-cold-threshold=threshold_int_number
157 User specified cold threshold for instr profile which will over‐
158 ride the cold threshold got from profile summary.
159 -suppl-min-size-threshold=threshold_int_number
161 If the size of a function is smaller than the threshold, assume
162 it can be inlined by PGO early inliner and it will not be ad‐
163 justed based on sample profile.
164 EXAMPLES
166 Basic Usage
167 Merge three profiles:
168 llvm-profdata merge foo.profdata bar.profdata baz.profdata -output merged.profdata
170 Weighted Input
172 The input file foo.profdata is especially important, multiply its
173 counts by 10:
174 llvm-profdata merge -weighted-input=10,foo.profdata bar.profdata baz.profdata -output merged.profdata
176 Exactly equivalent to the previous invocation (explicit form; useful
178 for programmatic invocation):
179 llvm-profdata merge -weighted-input=10,foo.profdata -weighted-input=1,bar.profdata -weighted-input=1,baz.profdata -output merged.profdata
181
183 SYNOPSIS
184 llvm-profdata show [options] [filename]
185 DESCRIPTION
187 llvm-profdata show takes a profile data file and displays the informa‐
188 tion about the profile counters for this file and for any of the speci‐
189 fied function(s).
190 If filename is omitted or is -, then llvm-profdata show reads its input
192 from standard input.
193 OPTIONS
195 -all-functions
196 Print details for every function.
197 -counts
199 Print the counter values for the displayed functions.
200 -function=string
202 Print details for a function if the function's name contains the
203 given string.
204 -help Print a summary of command line options.
206 -output=output, -o=output
208 Specify the output file name. If output is - or it isn't speci‐
209 fied, then the output is sent to standard output.
210 -instr (default)
212 Specify that the input profile is an instrumentation-based pro‐
213 file.
214 -text Instruct the profile dumper to show profile counts in the text
216 format of the instrumentation-based profile data representation.
217 By default, the profile information is dumped in a more human
218 readable form (also in text) with annotations.
219 -topn=n
221 Instruct the profile dumper to show the top n functions with the
222 hottest basic blocks in the summary section. By default, the
223 topn functions are not dumped.
224 -sample
226 Specify that the input profile is a sample-based profile.
227 -memop-sizes
229 Show the profiled sizes of the memory intrinsic calls for shown
230 functions.
231 -value-cutoff=n
233 Show only those functions whose max count values are greater or
234 equal to n. By default, the value-cutoff is set to 0.
235 -list-below-cutoff
237 Only output names of functions whose max count value are below
238 the cutoff value.
239 -showcs
241 Only show context sensitive profile counts. The default is to
242 filter all context sensitive profile counts.
243 -show-prof-sym-list=[true|false]
245 Show profile symbol list if it exists in the profile. This op‐
246 tion is only meaningful for sample-based profile in extbinary
247 format.
248 -show-sec-info-only=[true|false]
250 Show basic information about each section in the profile. This
251 option is only meaningful for sample-based profile in extbinary
252 format.
253
255 SYNOPSIS
256 llvm-profdata overlap [options] [base profile file] [test profile file]
257 DESCRIPTION
259 llvm-profdata overlap takes two profile data files and displays the
260 overlap of counter distribution between the whole files and between any
261 of the specified functions.
262 In this command, overlap is defined as follows: Suppose base profile
264 file has the following counts: {c1_1, c1_2, ..., c1_n, c1_u_1, c2_u_2,
265 ..., c2_u_s}, and test profile file has {c2_1, c2_2, ..., c2_n, c2_v_1,
266 c2_v_2, ..., c2_v_t}. Here c{1|2}_i (i = 1 .. n) are matched counters
267 and c1_u_i (i = 1 .. s) and c2_v_i (i = 1 .. v) are unmatched counters
268 (or counters only existing in) base profile file and test profile file,
269 respectively. Let sum_1 = c1_1 + c1_2 + ... + c1_n + c1_u_1 + c2_u_2
270 + ... + c2_u_s, and sum_2 = c2_1 + c2_2 + ... + c2_n + c2_v_1 + c2_v_2
271 + ... + c2_v_t. overlap = min(c1_1/sum_1, c2_1/sum_2) +
272 min(c1_2/sum_1, c2_2/sum_2) + ... + min(c1_n/sum_1, c2_n/sum_2).
273 The result overlap distribution is a percentage number, ranging from
275 0.0% to 100.0%, where 0.0% means there is no overlap and 100.0% means a
276 perfect overlap.
277 Here is an example, if base profile file has counts of {400, 600}, and
279 test profile file has matched counts of {60000, 40000}. The overlap is
280 80%.
281 OPTIONS
283 -function=string
284 Print details for a function if the function's name contains the
285 given string.
286 -help Print a summary of command line options.
288 -o=output or -o output
290 Specify the output file name. If output is - or it isn't speci‐
291 fied, then the output is sent to standard output.
292 -value-cutoff=n
294 Show only those functions whose max count values are greater or
295 equal to n. By default, the value-cutoff is set to max of un‐
296 signed long long.
297 -cs Only show overlap for the context sensitive profile counts. The
299 default is to show non-context sensitive profile counts.
300
302 llvm-profdata returns 1 if the command is omitted or is invalid, if it
303 cannot read input files, or if there is a mismatch between their data.
304
306 Maintained by the LLVM Team (https://llvm.org/).
307
309 2003-2021, LLVM Project
31012 2021-05-17 LLVM-PROFDATA(1)