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Updated TUNING (markdown)

Jason Volk 2020-09-09 02:59:43 -07:00
parent 91a3b86d10
commit df61f39da4
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TUNING.md

@ -49,7 +49,7 @@ Construct probes information about block devices using `sysfs(5)`. It must acqui
- **RocksDB must support parallel Direct-IO reads.**
Construct takes advantage of features incrementally between RocksDB v5.18 through <del>v6.10.2 (and beyond)</del>*. Unfortunately many distributions ship with RocksDB v5.17.2 (including Ubuntu 20.04) which lacks several features that maximize performance. When Construct is built with `--with-included-rocksdb` it defaults to v6.6.4 (matching Debian stable) which is recommended if possible. At the time of this writing, parallel Direct-IO reads have only recently landed in the RocksDB master branch and not any tagged release. This feature is significant enough for our workload that we preemptively advise configuring with the next tagged release `--with-included-rocksdb=v6.XX.X` once it is available to maximize peformance.
* **RocksDB 6.10.1 and 6.10.2 have a bug and cannot be used.** Please check for 6.10.3 or 6.11, otherwise you must use an older version.
* **RocksDB 6.10.1 through 6.11.X have a bug and cannot be used.** Please check for 6.12, otherwise you must use an older version.
### Optimizing Dynamic Memory