gcov-tool-6 - Online in the Cloud

PROGRAM:

NAME

gcov-tool - offline gcda profile processing tool

SYNOPSIS

gcov-tool [-v|--version] [-h|--help]

gcov-tool merge [merge-options] directory1 directory2
[-v|--verbose]
[-o| --output directory]
[-w|--weight w1,w2]

gcov-tool rewrite [rewrite-options] directory
[-v|--verbose]
[-o|--output directory]
[-s|--scale float_or_simple-frac_value]
[-n|--normalize long_long_value]

gcov-tool overlap [overlap-options] directory1 directory2
[-v|--verbose]
[-h|--hotonly]
[-f|--function]
[-F|--fullname]
[-o|--object]
[-t|--hot_threshold] float

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:

* 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.

-v
--verbose
Set the verbose mode.

-o directory
--output directory
Set the output profile directory. Default output directory name is merged_profile.

-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.

-v
--verbose
Set the verbose mode.

-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.

-n long_long_value
--normalize <long_long_value>
Normalize the profile. The specified value is the max counter value in the new
profile.

overlap
Computer 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.

-v
--verbose
Set the verbose mode.

-h
--hotonly
Only print info for hot objects/functions.

-f
--function
Print function level overlap score.

-F
--fullname
Print full gcda filename.

-o
--object
Print object level overlap score.

-t float
--hot_threshold <float>
Set the threshold for hot counter value.

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