Commit fcacb40d authored by A. Unique TensorFlower's avatar A. Unique TensorFlower Committed by TensorFlower Gardener
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FirstReadyManager for scheduling nodes in VirtualScheduler. 

The current FIFOManager may yield inefficient scheduling; _Recv pushed to the
FIFO blocks other nodes that can run before _Recv due to the node order in FIFO.
FirstReadyManager picks a node with the earliest time_ready in the queue,
avoiding this problem.

Also, fixed VirtualPlacer to properly set device when Node's device name does not
include job name and to set GPU:0 as default device.

PiperOrigin-RevId: 168418455
parent 7e47624f
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