Performance problem for training images on MXNet

After running my MXNet application like this snippet:

I found out that the training speed is only 300 samples per second, and the usage of GPU looks very strange:

About two days later, I just noticed that there are some messages reported by MXNet:

After changing my command to:

the speed of training has changed to 690 samples per second, and the usage of GPU became much smoothly since it could use more CPUs to decode image now:

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