Hi,
We have been using TFS 2013 build agents and build controllers for a long time then we upgraded to TFS 2015 update1. We had nighly builds taking 20 minutes to build a solution in sequence. We enabled Rolling builds and started to build in parallel. Build time was not affected too much. After 2 weeks of parallel builds, suddenly build which took 20 minutes, is now taking 70-80 minutes.
To provide some facts- build server is a virtual machine. Changed disks, virtual disk controller, doubled memory (no change), CPU utilization is not affected, disk defragmented, network checks, no improvement in build time. Build Agent and Build Controller were on the same machine and Controller service run by service use in domain. Event log on virtual build server shows Group Policy errors- "The processing of Group Policy failed. Group Policy settings will not be enforced until this event is resolved. View the event details for more information on this error.".AD team says this is not any issue.
It seemed like Build agent and Build controller were blocking the build process. So i separated Build Controller to a separate machine. Re-registered the services with TFS. And suddenly build times were back to baseline 20 mins! It seems to work! It worked for 2 days perfectly fine but build time was back to 70 mins!
Is there a solution to this problem? Has any one else had these kind of issues? Is there an issue with TFS 2015 update1 build agents and build controllers? Or is there an issue with running Build agent and controller services with network user or Domain service user? Build log doesnt give any information. Just the time taken by build steps.
We have other build agents too which are on virtual machines and running on TFS 2013 update 4 and has no such issues. Builds are not parallel and only one agent and controller running on same virtual machine.