This is a simple tool for displaying memory information including compression ratio and percentage of compressed memory in Linux kernel using zram. This tool works without zram, but in that case it displays only basic memory statistics.
LC_NUMERIC=en_GB.utf8 the output of
./zraminfo looks like this:
Physical memory: 4,111,052,800 bytes Buffers and cache: 599,769,088 bytes / 14.6% of physical memory Unallocated: 166,268,928 bytes / 4.0% of physical memory Compressed: 348,880,896 bytes / 8.5% of physical memory Decompressed size: 967,163,904 bytes / 20.5% of decompressed memory Compression ratio: 2.772
If zram is not familiar to you, see article in Wikipedia. If you are using recent Debian or Ubuntu, you can start using zram by installing zram-config:
sudo apt-get install zram-config