Zram is great but beware of the Ubuntu zram-config-0.5 package as its woefully out of date.

Checks the bugs on Ubuntu with zram and advise do it yourself or adopt and hack what I did.

github.com/StuartIanNaylor/zram-swap-config

In fact went block wear crazy with zram as any old zram drive
github.com/StuartIanNaylor/zramdrive
Logs
github.com/StuartIanNaylor/log2zram

zram has been multi stream since kernel 3.15 and its pure nuts to continue to create per core divided partitions and a whole lot more that zram-config-0.5 package does.
You can try mine but prob needs more than just my objections on launchpad.net/ubuntu/+source/zram-config/+bugs

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