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Optimize default compile to compilation platform by default

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Summary:
This diff changes compile to optimize for native platform by default. This will automatically turn on crc32 optimizations for modern processors, which greatly improves rocksdb's performance.

I also did some more changes to compilation documentation.

Test Plan:
compile with `make`, observe -march=native
compile with `PORTABLE=1 make`, observe no -march=native

Reviewers: sdong, rven, yhchiang, MarkCallaghan

Reviewed By: MarkCallaghan

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D30225
This commit is contained in:
Igor Canadi
2014-12-15 11:29:41 +01:00
parent cef6f84393
commit 06eed650a0
5 changed files with 13 additions and 39 deletions
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INSTALL.md
+5 -11
View File
@@ -2,7 +2,7 @@
RocksDB's library should be able to compile without any dependency installed,
although we recommend installing some compression libraries (see below).
We do depend on newer gcc with C++11 support.
We do depend on newer gcc/clang with C++11 support.
There are few options when compiling RocksDB:
@@ -15,9 +15,9 @@ There are few options when compiling RocksDB:
* `make all` will compile our static library, and all our tools and unit tests. Our tools
depend on gflags. You will need to have gflags installed to run `make all`.
* if Intel SSE instruction set is supported, set USE_SSE=" -msse -msse4.2 " to make sure
SSE4.2 is used to speed up CRC32 when calculating data checksum.
* By default the binary we produce is optimized for the platform you're compiling on
(-march=native). If you want to build a portable binary, add 'PORTABLE=1' before
your make commands, like this: `PORTABLE=1 make static_lib`
## Dependencies
@@ -76,13 +76,7 @@ SSE4.2 is used to speed up CRC32 when calculating data checksum.
* Install via [homebrew](http://brew.sh/).
* If you're first time developer in MacOS, you still need to run: `xcode-select --install` in your command line.
* run `brew tap homebrew/dupes; brew install gcc47 --use-llvm` to install gcc 4.7 (or higher).
* Install zlib, bzip2 and snappy libraries for compression.
* Install gflags. We have included a script
`build_tools/mac-install-gflags.sh`, which should automatically install it (execute this file instead of runing using "source" command).
If you installed gflags by other means (for example, `brew install gflags`),
please set `LIBRARY_PATH` and `CPATH` accordingly.
* Please note that some of the optimizations/features are disabled in OSX.
We did not run any production workloads on it.
* run `brew install rocksdb`
* **iOS**:
* Run: `TARGET_OS=IOS make static_lib`. When building the project which uses rocksdb iOS library, make sure to define two important pre-processing macros: `ROCKSDB_LITE` and `IOS_CROSS_COMPILE`.