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Builds from same configuration are not allowed to run on same agent concurrently as they will be using the same workspace to cause conflicts. However builds from different configurations can run on same agent as they will be using different workspaces. If you want to make sure agent run only one build in the same time across all configurations, you may add a resource and configure the master step of all involved configurations to use that resource. A detail explanation can be found here:
http://wiki.pmease.com/display/QB60/One ... +One+Agent
If I have two configurations that use the same workspace (because both are set to 'Use workspace directory of parent configuration'), can I expect them to not run on the same agent due to shared workspace?
They may run concurrently in this case unfortunately as QB only checks configuration id. QB does not check the actual workspace being used as it is difficult to assume if they are affecting with each other (assume the case if one workspace resides as sub folder under another).
Okay, thanks. I wrote a semaphore lock around the workspace to counter this, but I wanted to be sure that I wasn't encountering a bug.