Good afternoon,
I'd like to know if it could be possible to combine several gcda files without using the lcov -a tracefile1 -a tracefile2 -o output.html.
Actually this is my spec:
compile my code on local server
excute tests on remote server 1 and 2
{
then copy the generated gcda on server1 on the local compilation server and generate the info file thanks to lcov
then copy the generated gcda on server2 on the local compilation server and generate the info file thanks to lcov
then combine both info files
}
The info file generation is actually quite long and I'd like to know if there is a possibility to combine gcdas from servers 1 and 2 without creating the info file.
And generate the info file only for the resulting gcdas?
Gcov as of now does not have any functionality to merge coverage reports.
I have a setup similar to yours and I use lcov to merge the tracefiles(or .info files).You can write scripts that will transfer the .gcda files from remote servers back to your local machine to generate the coverage report. There are other tools available that can solve your problem like TestWellCTC++,Rapicover,etc but they are not open source.
Gcov as of now has functionality to merge coverage reports:
$ gcov-tool merge path1 path2
(by default results will be stored in merged_profile folder).
To add to another answer, gcov can also merge coverage data from multiple runs with the help of gcov-tool:
$ gcov-tool merge dir1 dir2
(by default results will be stored into merged_profile folder).
Unfortunately gcov-tool allows merging only two profiles at a time but you can use gcov-tool-many to work around this.
Related
I am using gcov to find code coverage of my application while running functional test cases.
Issue: .gcda files are not getting created for few classes though those classes are being executed
Steps:
Compile Application code with gcov and verify .gcno files are generated for all classes
Create binary image of compiled code and deploy server using that binary
Use cross profiling while deploying server. Home directory structure for my source code was "/proj/QQ/scm/tools/jenkins/db_ws/FunctionTestCoverage/ccode/" and I used below mentioned gcov parameters for cross profiling
GCOV_PREFIX=/automation/testCoverage
GCOV_PREFIX_STRIP=7
Run Functional Test Cases to hit application code
.gcda files gets created for few classes only. It is not getting created for all classes which are being executed.
.gcda files are generating under directory structure "/automation/testCoverage/ccode"
I believe this should not be issue with cross profiling. suppose I have 5 directories in parallel then .gcda files are generating for 2 directories only.
What can be root cause for my issue where .gcda are generating for only few files and how to resolve this?
I have written a sample program using C++. I have written corresponding unit tests using GUNIT framework. I was successfully able to generate.gcda and .gcno files for every source file. I used (gcov -b -l -p -c *.gcno) command in the folder where the .gcno files were generated. I am using gcov 7.5.0 . When i ran this command i saw that it gave me a)Lines covergae in percentage b)Branches covered in percentage c)Taken atleast once . Next i ran (gcovr --html -o Filename.html -r /path_to_C_sourceFiles/ .) command to generate the html output for this data. In the html file i see that the branch covergae data is extracted from the taken atleast once data which was generated by the gcov. Why is the html not taking the branches covered percentage from the gcov data and displaying it as branch covergae. Taken atleast data given by the gcov tool is a reduced number when compared to branches percentage. What is this taken atleast once?
A branch is covered if it was taken at least once. If a branch is executed multiple times, it is not more covered. So gcovr primarily considers covered/uncovered status for lines and branches, whereas GCC's gcov tool shows execution counts and branch probabilities.
Having access to the branch probabilities can be useful. Not in the context of testing, but perhaps for low-level code optimization. If you need that data, you will likely want to look at the gcov files yourself.
However, the next version of gcovr (expected to be gcovr 4.3) will show branch counts (not percentages) in the HTML report:
For each line with branch coverage data, there will be a popup that shows full branch counts.
You can use this functionality right now if you install gcovr's development version:
pip install git+https://github.com/gcovr/gcovr.git
Good morning,
I've got a problem when using GCOV within my working environment.
Gcov is working very well when I run some tests cases (up to 1000) but no gcda are generated when running more tests.
This is how I use it.
I compile my code with gcov flags correctly set
I boot a test server containing the gcov libs, and the variables GCOV_PREFIX and GCOV__PREFIX_STRIP
I launch my regression on this server
Once finished I stop the server and now all the gcda files are generated
use lcov and genhtml to generate the test coverage and the report.
This works very well when I've got few tests to lauch (up to 1000 cases I guess), but if I run more tests, I don't get any gcda files anymore...
I could not find any documentation on this part, is there a buffer somewhere, where all the gcdas files are stored waiting for the server to be released?
Is it possible to parameter this setting?
Is there any documentation on this subject somewhere?
Thanks a lot for your help.
Regards,
Thomas
I am trying to create report using ant in jmeter, meaning the full report.
I downloaded ant and it is installed as expected.
first I want to understand if ant command need to perform after test plan ran in the past? meaning it is offline process that creates the html reports? after the test plan finished?
Or is it command that actually used to run the test plan and create the html, meaning I do not need to run jmeter before?.
I used this command
jmeter -n -t C:\JMETER\Framework\Test_Fragment\Kung_Fu.jmx -l C:\Users\stackoverflow\Desktop\Jmeter_reports\results22_05_2018.csv
to run jmeter from command line, and create csv, so do I need two commands? one for creating csv and one for the ant? and if I create the csv where can I find the jtl of the testplan.
Name of test plan kung_fu
name of csv results22_05_2018.csv
what are the processes to run he ant, since I rename the Kung_Fu.jmx to test.jmx and put it in extras folder and when I command ant, it says test.jtl is not found.
can someone give a full explanation about the whole process
Rename results22_05_2018.csv into results22_05_2018.jtl and copy it to "extras" folder of your JMeter installation
Execute the following command in "extras" folder of your JMeter installation:
ant -Dtest=results22_05_2018 xslt-report
HTML report will be available as results22_05_2018.html
For more details see:
build.xml - reference Ant build file, by default it:
looks for Test.jmx file in the current folder
executes it and stores the result into Test.jtl file
applies XSLT transformation to the Test.jtl file and generates HTML file out of it.
JMeter Ant Task
Five Ways To Launch a JMeter Test without Using the JMeter GUI
When i build my project for coverage testing with "--coverage -fprofile-arcs -ftest-coverage", and then move the build and source to the other user directory to execute testing. I will get so many problems such as "xxx/cc/cc/getopt_log.c:cannot open source file"
the details as the below:
Processing cs/CMakeFiles/cfa/__/src/base/fault_injection.c.gcda
/home/cov/build/xfcq/src/base/fault_injection.c:cannot open source file
the path of "/home/cov/build/xfcq/src/base/fault_injection.c" is the path of build environment, how to change it as the relative path or the path I specified.
I tried to use GCOV_PREFIX and GCOV_PREFIX_STRIP, these can't work well for me.
I also tried to add -b option for lcov, it does not also work well for me.
e.g., lcov --gcov-tool=/bin/gcov -d . -b xx/src -t "xfcq" -o test_cov.info
do you have idea to resolve it?
Well for using gcov coverage process you should never move the files after building your project, instead you should modify your automated build scripts to build everything to the desired location.
When you compile your project with the specified options it generates *.gcno files for each source file which are necessarily the flow chart like details of the relevant source file.
So, the object files are instrumented in such a way that they should trigger function(added by compiler to generate coverage info ) whenever any line of statement is executed to generate *.gcda files with all the execution information.
Note: I can see that you have specified three options in question (--coverage -fprofile-arcs -ftest-coverage) which is again wrong, as --coverage works as a replacement to the other two.
If you specify only --coverage then it will do for the compilation and the linking too.(remember to use it at both the places positively though)