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Control Build Concurrency with Resources
As explained in Working with Resources section, one can define resources in grid page to control how many steps can run concurrently. Specifically, if resource requirement is applied to master step, the whole build will be queued when the requirement is not satisfied. You may also refer to the resource management tutorial on how to control the build concurrency.
Concurrency of Builds of the Same Configuration
Concurrency of builds of the same configuration is also affected by workspaces. QuickBuild guarantees that a workspace is only used by one build at a time. Assume that step1 and step2 belongs to build1 and build2 respectively. If step1 and step2 both matches the single same node, the second step will wait until the first step finishes. Specifically if the waiting step is of master step, the whole build will be put into queue for waiting.