I have a matrix project to build different C# projects/solutions. There is one git repository for all solutions.
The matrix job is configured for Git to checkout the master branch to a local directory, and then invokes a downstream project for each matrix element (solution). That downstream project has not Git configuration, and simply builds the solution using MSBuild. What I am observing (looking at the console output for the Matrix build job instance) is the matrix job performs the git checkout, which takes about 4 minutes. It then says "Triggering <matrix element>", but that downstream project doesn't show up in the build list for another 4-5 minutes. Based on noticing that the content of the checkout directory is changing (total size differences) during the period between when it says "Triggering ..." and when that downstream job actually starts, my guess is that another git checkout is occurring behind the scenes. Obviously, this adds a significant amount of time to the total length of the matrix build. The builds of each solution take under 1 minute. So for the 7 solutions, I would expect the length of time to be 4+(7*1) or roughly 11 minutes, but with the 4-5 minute delay between each matrix element, it takes (4*7) + (7*1) or roughly 30 minutes. Our CI/CD processes are maturing, and the lengthy delay between checkin at deploy to staging is now slowing us down. Can anyone provide me guidance on what is going on behind the scenes (nothing in any Jenkins log that I can find), or tell me how I can configure the matrix job "properly" to not do this? This has run fast, sometimes - but I think perhaps it stopped working after updating plugins, or may somehow be related to the plugins installed - I just don't know where to start to look. The git section of the matrix job has: - Additional Behaviors : Checkout to a subdirectory: C:\Build\Source\WebPortal\Master\Dev - Advanced sub-module behavior: Recursively update submodules (checked) - Prune stale remote-tracking branches (not sure this is necessary?) Here is the console log for the matrix job: Started by user < <http://autobuild.blueport.com/user/bmoffat>me> [EnvInject] - Loading node environment variables. Building in workspace C:\Tools\Jenkins\jobs\BuildAllWebPortals\workspace > C:\Tools\Git\cmd\git.exe rev-parse --is-inside-work-tree Fetching changes from the remote Git repository > C:\Tools\Git\cmd\git.exe config remote.origin.url <our git repository url> Pruning obsolete local branches Fetching upstream changes from <our git repository url> > C:\Tools\Git\cmd\git.exe --version > C:\Tools\Git\cmd\git.exe fetch --tags --progress <our git repository url> > +refs/heads/master:refs/remotes/origin/master --prune > C:\Tools\Git\cmd\git.exe rev-parse "origin/master^{commit}" Checking out Revision b18aa8cff0aa9da9166f740877845cef27b612ff (origin/master) > C:\Tools\Git\cmd\git.exe config core.sparsecheckout > C:\Tools\Git\cmd\git.exe checkout -f b18aa8cff0aa9da9166f740877845cef27b612ff > C:\Tools\Git\cmd\git.exe rev-list b18aa8cff0aa9da9166f740877845cef27b612ff > C:\Tools\Git\cmd\git.exe remote > C:\Tools\Git\cmd\git.exe submodule init > C:\Tools\Git\cmd\git.exe submodule sync > C:\Tools\Git\cmd\git.exe config --get remote.origin.url > C:\Tools\Git\cmd\git.exe submodule update --init --recursive Email was triggered for: Before Build Sending email for trigger: Before Build Sending email to: <distribution list> Triggering MobileASI <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=MobileASI/> MobileASI <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=MobileASI/> completed with result SUCCESS Triggering Furniture <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=Furniture/> Furniture <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=Furniture/> completed with result SUCCESS Triggering RetailPortal <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=RetailPortal/> RetailPortal <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=RetailPortal/> completed with result SUCCESS Triggering MobileLeons <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=MobileLeons/> MobileLeons <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=MobileLeons/> completed with result SUCCESS Triggering Leons <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=Leons/> Leons <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=Leons/> completed with result SUCCESS Triggering MobileVCF <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=MobileVCF/> MobileVCF <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=MobileVCF/> completed with result SUCCESS Triggering RetailTool <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=RetailTool/> RetailTool <http://autobuild.blueport.com/job/BuildAllWebPortals/Portal=RetailTool/> completed with result SUCCESS No emails were triggered. 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