gcov-tool(1)
gcc-7.3.0 1
GCOV-TOOL(1) GNU GCOV-TOOL(1)
NAME
gcov-tool - offline gcda profile processing tool
SYNOPSIS
gcov-tool [-v|--version] [-h|--help]
gcov-tool merge [merge-options] directory1 directory2
[-o|--output directory]
[-v|--verbose]
[-w|--weight w1,w2]
gcov-tool rewrite [rewrite-options] directory
[-n|--normalize long_long_value]
[-o|--output directory]
[-s|--scale float_or_simple-frac_value]
[-v|--verbose]
gcov-tool overlap [overlap-options] directory1 directory2
[-f|--function]
[-F|--fullname]
[-h|--hotonly]
[-o|--object]
[-t|--hot_threshold] float
[-v|--verbose]
DESCRIPTION
gcov-tool is an offline tool to process gcc's gcda profile
files.
Current gcov-tool supports the following functionalities:
* merge two sets of profiles with weights.
* read one set of profile and rewrite profile contents.
One can scale or normalize the count values.
Examples of the use cases for this tool are:
* Collect the profiles for different set of inputs, and
use this tool to merge them. One can specify the weight
to factor in the relative importance of each input.
* Rewrite the profile after removing a subset of the gcda
files, while maintaining the consistency of the summary
and the histogram.
* It can also be used to debug or libgcov code as the
tools shares the majority code as the runtime library.
Note that for the merging operation, this profile generated
offline may contain slight different values from the online
merged profile. Here are a list of typical differences:
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GCOV-TOOL(1) GNU GCOV-TOOL(1)
* histogram difference: This offline tool recomputes the
histogram after merging the counters. The resulting
histogram, therefore, is precise. The online merging
does not have this capability -- the histogram is merged
from two histograms and the result is an approximation.
* summary checksum difference: Summary checksum uses a
CRC32 operation. The value depends on the link list
order of gcov-info objects. This order is different in
gcov-tool from that in the online merge. It's expected
to have different summary checksums. It does not really
matter as the compiler does not use this checksum
anywhere.
* value profile counter values difference: Some counter
values for value profile are runtime dependent, like
heap addresses. It's normal to see some difference in
these kind of counters.
OPTIONS
-h
--help
Display help about using gcov-tool (on the standard
output), and exit without doing any further processing.
-v
--version
Display the gcov-tool version number (on the standard
output), and exit without doing any further processing.
merge
Merge two profile directories.
-o directory
--output directory
Set the output profile directory. Default output
directory name is merged_profile.
-v
--verbose
Set the verbose mode.
-w w1,w2
--weight w1,w2
Set the merge weights of the directory1 and
directory2, respectively. The default weights are 1
for both.
rewrite
Read the specified profile directory and rewrite to a
new directory.
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GCOV-TOOL(1) GNU GCOV-TOOL(1)
-n long_long_value
--normalize <long_long_value>
Normalize the profile. The specified value is the
max counter value in the new profile.
-o directory
--output directory
Set the output profile directory. Default output
name is rewrite_profile.
-s float_or_simple-frac_value
--scale float_or_simple-frac_value
Scale the profile counters. The specified value can
be in floating point value, or simple fraction value
form, such 1, 2, 2/3, and 5/3.
-v
--verbose
Set the verbose mode.
overlap
Compute the overlap score between the two specified
profile directories. The overlap score is computed
based on the arc profiles. It is defined as the sum of
min (p1_counter[i] / p1_sum_all, p2_counter[i] /
p2_sum_all), for all arc counter i, where p1_counter[i]
and p2_counter[i] are two matched counters and
p1_sum_all and p2_sum_all are the sum of counter values
in profile 1 and profile 2, respectively.
-f
--function
Print function level overlap score.
-F
--fullname
Print full gcda filename.
-h
--hotonly
Only print info for hot objects/functions.
-o
--object
Print object level overlap score.
-t float
--hot_threshold <float>
Set the threshold for hot counter value.
-v
--verbose
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GCOV-TOOL(1) GNU GCOV-TOOL(1)
Set the verbose mode.
SEE ALSO
gpl(7), gfdl(7), fsf-funding(7), gcc(1), gcov(1) and the
Info entry for gcc.
COPYRIGHT
Copyright (c) 2014-2017 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation
License, Version 1.3 or any later version published by the
Free Software Foundation; with the Invariant Sections being
"GNU General Public License" and "Funding Free Software",
the Front-Cover texts being (a) (see below), and with the
Back-Cover Texts being (b) (see below). A copy of the
license is included in the gfdl(7) man page.
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU
software. Copies published by the Free Software Foundation raise
funds for GNU development.
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