how to examine the already usage amount of varnish cache memory or file

[Xianzhe Wang]

In order to test my varnish sever, I wanna to know how:
many bytes the total cache objects(alive, not out of date) have taken?  Is
my cache storage file empty or full?
So are there any order can show this information?

Thanks a lot for help.

Regards,
Shawn
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