CPU work queue empty

The CPU work queue is currently empty. This means that all of the hybrid2 WUs are in progress to finish that first hybrid2 set.A bit of poor planning on our part as we could watch all week as the CPU queue was draining and we don't have the next batch queued.I have code changes essentially ready for retooling the work generator, scheduler, and validator but Martin and I haven't had a chance to touch base yet. I expect we should get everything ready to go and rolling again within the next 24 hours.*note* plenty of cuda work remains. We attempted to cross the steams, in that we assigned some CPU work to the cuda side and it didn't go well for clients. Kicking cuda work over to CPUs would result in WUs that are a good 7 times longer. Some may not mind if they have crunched any of the really long tasks on Primegrid but it seems like a bad idea over all :)

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