zstd provides compression similar to zlib but uses much less CPU. This looks like a big deal for MyRocks/MongoRocks. I think it can also be a big deal for WiredTiger.

For some perf results see http://smalldatum.blogspot.com/2016/09/zlib-vs-zstd-for-myrocks-running.html

For zstd see http://facebook.github.io/zstd/