Pulling a image with dragonfly is actually slower

[JiaDong007]

Question

I am use docker registry,
When using Dragonfly to pull two nodes at the same time:
real 12m39.620s
user 0m2.326s
sys 0m0.892s

When not using Dragonfly to pull two nodes at the same time:
real 6m57.331s
user 0m0.475s
sys 0m0.432s

[allencloud]

The statistics you collected is reasonable. Your cluster scale is very small. When your cluster only has 2 nodes, the time is 2 times native pulling times.

Because the supernode will first download the image from registry. Then node will download image from supernode. Then real 12m39.620s is reasonable.

If you have lots of nodes in your cluster, the parallel downloading will consumes all the bandwidth of the registry, then use p2p could save your bandwidth and improve your efficiency. @JiaDong007

[allencloud]

I am closing this issue. I am not sure if my answer satisfies you. If you have further questions, please feel free to re-open this issue. Thanks. @JiaDong007

[JiaDong007]

Now i have 100 dfclient nodes,but i docker pull the same image in parallel ，them spend more than 20 minutes on average，some cost 1 hour.What is the reason? @allencloud