6a171724b7
Summary: In preparing to utilize a new Intel instruction extension, I noticed problems with the existing build script in regard to the existing utilized extensions, either with USE_SSE or PORTABLE flags. * PORTABLE=0 was interpreted the same as PORTABLE=1. Now empty and 0 mean the same. (I guess you were not supposed to set PORTABLE= if you wanted non-portable--except that...) * The Facebook build script extensions would set PORTABLE=1 even if it's already set in a make var or environment. Now it does not override a non-empty setting, so use PORTABLE=0 for fully optimized build, overriding Facebook environment default. * Put in an explanation of the USE_SSE flag where it's used by build_detect_platform, and cleaned up some confusing/redundant associated logic. * If USE_SSE was set and expected intrinsics were not available, build_detect_platform would exit early but build would proceed with broken, incomplete configuration. Now warning is gracefully recovered. * If USE_SSE was set and expected intrinsics were not available, build would still try to use flags like -msse4.2 etc. which could lead to unexpected compilation failure or binary incompatibility. Now those flags are not used if the warning is issued. This should not break or change existing, valid build scripts. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5800 Test Plan: manual case testing Differential Revision: D17369543 Pulled By: pdillinger fbshipit-source-id: 4ee244911680ae71144d272c40aceea548e3ce88
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it specially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.