CMake Scripting Of CTest

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Testing With CTest

In Testing With CTest, you learned how to use CTest to perfom simple testing. That page also describes how to use CTest to submit dashboards. The typical sequence of commands that dashboard contributor will do involves: 

cd /location/of/binary/Directory
rm -rf BinaryDirectory
mkdir BinaryDirectory
cd BinaryDirectory
ccmake /location/of/source/Directory
ctest -D Nightly

This is done on a typical UNIX system. On Windows system, the contributor needs to do something similar using Windows command interpreter, using something like Cygwin, or using a scripting language such as Perl, Python, or Tcl. Unfortunately none of these solutions is portable.

CTest Scripting

CTest has a built-in scripting mode, which significantly simplifies generating dashboards. Here is example of this script: 

SET (CTEST_SOURCE_DIRECTORY "C:/Hoffman/My Builds/CMake")
SET (CTEST_BINARY_DIRECTORY "C:/Hoffman/My Builds/CMakeVSNMake71")

SET (CTEST_CVS_COMMAND "C:/cygwin/bin/cvs.exe")
SET (CTEST_CVS_CHECKOUT  "${CTEST_CVS_COMMAND} -d
:pserver:hoffman@www.cmake.org:/cvsroot/CMake co -d
\"${CTEST_SOURCE_NAME}\" CMake")

# which ctest command to use for running the dashboard
SET (CTEST_COMMAND 
  "C:/Program Files/CMake/bin/ctest.exe -D Nightly"
  )

# what cmake command to use for configuring this dashboard
SET (CTEST_CMAKE_COMMAND 
  "C:/Program Files/CMake/bin/cmake.exe"
  )


####################################################################
# The values in this section are optional you can either
# have them or leave them commented out
####################################################################

# should ctest wipe the binary tree before running
SET (CTEST_START_WITH_EMPTY_BINARY_DIRECTORY TRUE)

# this is the initial cache to use for the binary tree, be careful to
escape
# any quotes inside of this string if you use it
SET (CTEST_INITIAL_CACHE "
MAKECOMMAND:STRING=nmake -i
CMAKE_MAKE_PROGRAM:FILEPATH=nmake
CMAKE_GENERATOR:INTERNAL=NMake Makefiles
BUILDNAME:STRING=Win32-nmake71
SITE:STRING=VOGON.kitware
CVSCOMMAND:FILEPATH=C:/cygwin/bin/cvs.exe
")

# set any extra environment variables here
SET (CTEST_ENVIRONMENT
)

This script defined all the information CTest needs to submit CMake dashboard on Windows XP computer using NMake build system. The syntax used is the same as in CMake. Also, most commands available in CMake are available here, except things that require generator, such as TRY_COMPILE, ADD_LIBRARY, etc.

The script can be run by executing: 

 ctest -S /path/to/script.cmake

or in this case: 

 c:/Program Files/CMake/bin/ctest -S

c:/Hoffman/DashboardScripts/vogon_cmake_nmake.cmake

Main Settings

Every CTest script has to contain the source and binary directory: 

 SET (CTEST_SOURCE_DIRECTORY "$ENV{HOME}/Dashboards/My

Testing/Insight") 

 SET (CTEST_BINARY_DIRECTORY "$ENV{HOME}/Dashboards/My

Testing/Insight-bin")

The "$ENV{HOME}" gets replaced by the environment variable "HOME", which on most systems points to user's home directory.

Second thing we need is the command that perform initial configuration of the project. For example, if the project uses CMake, then the command would be something like: 

 SET (CTEST_CMAKE_COMMAND "/usr/local/bin/cmake")

That assumes that CMake is installed in /usr/local. Similarly to setting up CMake command, we need to setup the way CTest will be called. Let say in your case you run CTest using: 

 ctest -D Nightly

Then the command in the CTest script should be: 

 SET (CTEST_COMMAND "/usr/local/bin/ctest -D Nightly")

The final important piece we need is the initial cache that CMake uses to configure the project. This should be minimal set of settings that will allow the system to test certain aspect of the project. Example initial cache would be: 

SET (CTEST_INITIAL_CACHE "
//Name of generator.
CMAKE_GENERATOR:INTERNAL=Visual Studio 7

//Name of the build
BUILDNAME:STRING=Win32-vs70

//Name of the computer/site where compile is being run
SITE:STRING=DASH2.kitware

//Build VTK with shared libraries.
BUILD_SHARED_LIBS:BOOL=ON

//Path to the CVS
CVSCOMMAND:FILEPATH=C:/cygwin/bin/cvs.exe

//ITK TCL and Python wrapping
ITK_CSWIG_TCL:BOOL=ON
ITK_CSWIG_PYTHON:BOOL=ON
")

This will set the generator to be "Visual Studio 7", it will use shared libraries and turn on TCL and Python wrapping. Also, in the cache we can set the SITE and BUILDNAME variables, which will be used to display the testing results on the dashboard.

This is it. The CTest script can now be tested using: 

 ctest -S /path/to/script/script.cmake -V

The -V argument tells CTest to be extra verbose when doing dashboard.

More Settings

The main settings will generate dashboard for most systems. There are however issues in certain setups.

Most dashboard contributors want to start dashboard and not touch those systems for months. The problem is that the binary directory of the project will grow larger and larger. Common practice therefore is to wipe out binary directory every time dashboard is run. We can achieve this in CTest script by setting: CTEST_START_WITH_EMPTY_BINARY_DIRECTORY: 

 SET (CTEST_START_WITH_EMPTY_BINARY_DIRECTORY TRUE)

Now CTest will wipe out the binary tree every time. Make sure that the source tree is not equal to binary tree.

Second useful option is setting of environment in which CTest runs. Let say you have Cygwin, Borland, Visual Studio, and Intel compiler on your Windows system and you do not want to have system's global PATH pointing to various directories (Borland and Cygwin use "make", which one should be used). Now you want to do Borland dashboard. You can set environment variables using CTEST_ENVIRONMENT: 

 SET (CTEST_ENVIRONMENT

"PATH=c:/WINDOWS/system32\;c:/WINDOWS\;c:/Programs/Borland/Bcc55/Bin"

Note that CTEST_ENVIRONMENT can accept multiple environment variables. For example: 

 SET (CTEST_ENVIRONMENT
   "DISPLAY=:0"
   "GLIBCPP_FORCE_NEW=1"
   "CC=gcc-3.4"
   "CXX=g++-3.4"
 )

Another useful thing to do is to perform extra update on external repository. For example, VTK dashboard need to update VTK data. This can be achieved using CTEST_EXTRA_UPDATES_*. This also requires the CTEST_CVS_COMMAND to be set. An example of extra update is: 

 SET (CTEST_CVS_COMMAND "/usr/bin/cvs")
 SET (CTEST_EXTRA_UPDATES_1 "$ENV{HOME}/Dashboards/MyTests/VTKData"

"-dAP")

There can be up to ten CTEST_EXTRA_UPDATES_* settings: CTEST_EXTRA_UPDATES_1, CTEST_EXTRA_UPDATES_2, ..., CTEST_EXTRA_UPDATES_10.

Advanced Settings

When performing complex dashboards setups, some more CMake/CTest knowledge is needed. This section will describe solutions to some common CTest problems.

Doing memory checking using Valgrind or similar product can take significant amount of time. There are two improvements the dashboard contributor can do to make dashboard more useful. First one is to submit partial results. This can be achieved by breaking down the CTest run into individual runs: 

 SET (CTEST_COMMAND 
   "/usr/local/bin/ctest -D NightlyStart"
   "/usr/local/bin/ctest -D NightlyUpdate"
   "/usr/local/bin/ctest -D NightlyConfigure"
   "/usr/local/bin/ctest -D NightlyBuild"
   "/usr/local/bin/ctest -D NightlyTest"
   "/usr/local/bin/ctest -D NightlySubmit"
   "/usr/local/bin/ctest -D NightlyMemCheck"
   "/usr/local/bin/ctest -D NightlySubmit"
   )

The first six CTest commands will perform standard Nightly dashboard. The last two will perform only Memory checking and submission. This the whole dashboard submission will be there except the memory checking. Once the memory checking is completed, it will be submitted.

The second thing is to add special flags to make the CTest only test subset of tests: 

 SET (CTEST_COMMAND
   ...
   "/usr/local/bin/ctest -D NightlyMemCheck -I 0,,17"
   "/usr/local/bin/ctest -D NightlySubmit"
   )

The "-I 0,,17" will tell CTest to only run memory checking of every 17th test.

Let say you do not want to require the source of the project to be available. This is useful if the dashboards are performed on the temporary drive that can get erased. The following setting will checkout the source tree of CMake out of CVS repository before the testing is performed: 

 SET (CTEST_CVS_CHECKOUT
   "${CTEST_CVS_COMMAND} -q -z3
    -d :pserver:anoncvs@www.cmake.org:/cvsroot/CMake
    co -d \"CMake\" -D yesterday CMake")

Another useful feature is to backup source tree before performing dashboard. This way if the build fails, you can restore the old tree. This is useful when you require the source tree to be in good condition. This option has to be used in combination with CTEST_CVS_CHECKOUT. To turn this feature on, add this to CTest script: 

 SET (CTEST_BACKUP_AND_RESTORE TRUE)

When setting up Continuous dashboard, the CTest has to be run periodically to check if there were any changes in the source. When the change appears, the full dashboard is tested. This can be achieved by running CTest from system scheduler or some script, or by using Continuous feature of CTest script. First of all, make sure that CTEST_COMMAND is using Continuous model: 

 SET (CTEST_COMMAND 
   "C:/Program Files/CMake20/bin/ctest.exe -D Continuous"
   )

Also, if the number of tests is high, you may want to only run subset of tests: 

 SET (CTEST_COMMAND 
   "C:/Program Files/CMake20/bin/ctest.exe -D Continuous -I ,,3"
   )

Now set the continuous parameters: 

 SET (CTEST_CONTINUOUS_DURATION 600)
 SET (CTEST_CONTINUOUS_MINIMUM_INTERVAL 10)
 SET (CTEST_START_WITH_EMPTY_BINARY_DIRECTORY_ONCE 1)

The CTEST_CONTINUOUS_DURATION is the duration of Continuous testing in minutes. In this case it will run Continuous dashboards for 10 hours. If it starts at 8 AM, the last continuous will be done around 6 PM. The CTEST_CONTINUOUS_MINIMUM_INTERVAL is the minimum interval between Continuous checks. In this case it will perform check every 10 minutes. CTEST_START_WITH_EMPTY_BINARY_DIRECTORY_ONCE will remove binary tree once the first Continuous is run. This way Continuous tests will take less time, since it will only rebuild modified files.

Available Variables

When running CTest scripts, there are several variables available that can simplify writing CTest scripts. These variable include:

Variable Description
CTEST_SCRIPT_DIRECTORY Location of directory in which the CTest script is
CTEST_SCRIPT_NAME Name of the CTest script
CTEST_SCRIPT_ARG The extra arguments passed to CTest -S. For example, when running: 
ctest -S /home/scripts/mysystem.cmake,Experimental

then the CTEST_SCRIPT_ARG will be set to Experimental. Then this can be used inside the script: 

SET(MODEL Nightly)
IF(${CTEST_SCRIPT_ARGS} MATCHES Experimental)
  SET(MODEL Experimental)
ENDIF(${CTEST_SCRIPT_ARGS} MATCHES Experimental)
SET (CTEST_COMMAND
    "/usr/local/bin/ctest -D ${MODEL}")

Now we can specify Nighlty or Experimental without editing CTest script.


Conclusion

CTest scripts can significantly simplify dashboard contribution. Using simple template script with slight modification, the whole cluster of various systems can submit dashboards.

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