Willem Jan Withagen wrote:
And to just add something practical to this: recently lz4 compression has made
it into ZFS and has become the standard advice for compression.
It is considered the most efficient tradeoff between compression efficiency
and cpu-cycle consumption, and it is supposed to keep up with the throughput
that devices in the backingstore have. Not sure how that pans out with a full
SSD array, but opinions about that will be there soon as SSD are getting cheap
rapidly.
There are plenty of choices:
compression on | off | lzjb | gzip | gzip-[1-9] | zle | lz4
But using other compression algos is only recommended after due testing.
On the testing front, this will help
https://github.com/hyc/PolyZ
Then you only need to write your test code once, to a single API, and you can
evaluate all of the different compression libraries just by changing LD_PRELOAD.
This is what I used for our own compression evaluation...
http://symas.com/mdb/inmem/compress/
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-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
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