Add megacache to index (#3279) #3964

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 15s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	52m 59s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	22m 27s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	34m 3s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	23m 20s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	20m 41s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	22m 40s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	17m 10s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	23m 1s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	18m 15s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	18m 20s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	32m 53s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	34m 29s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	55m 8s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	30m 14s
pytorch_tutorial_build_manager	22m 19s
	7h 23m 14s

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