AutoTVM considers >150 failures as an abnormal situation. Although I never check how reasonable this assumption is, I barely get >150 failures in several thousands of trials. I would say if you are tuning a common model (i.e., ResNet 50) on a common device (V100), then you shouldn’t get that many errors. Your setup or system environment may have problems.
As long as you have one or more config with error code 0, you should have at least one working config with >0 GFLOPs. One possible reason that you see 0.0 GFLOPs is that the throughput is less than 0.1 GFLOPs so it will show “0.0” in %.1f precision. Anyway, I suggest you taking a few failed configs to make a depth analysis.