110 lines
3.4 KiB
Markdown
110 lines
3.4 KiB
Markdown
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Libaio Native Libraries
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=======================
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ActiveMQ distributes a native library, used as a bridge between ActiveMQ
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and Linux libaio.
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`libaio` is a library, developed as part of the Linux kernel project.
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With `libaio` we submit writes to the operating system where they are
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processed asynchronously. Some time later the OS will call our code back
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when they have been processed.
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We use this in our high performance journal if configured to do so,
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please see ?.
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These are the native libraries distributed by ActiveMQ:
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- libActiveMQAIO32.so - x86 32 bits
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- libActiveMQAIO64.so - x86 64 bits
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When using libaio, ActiveMQ will always try loading these files as long
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as they are on the [library path](#using-server.library.path).
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Compiling the native libraries
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==============================
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In the case that you are using Linux on a platform other than x86\_32 or
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x86\_64 (for example Itanium 64 bits or IBM Power) you may need to
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compile the native library, since we do not distribute binaries for
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those platforms with the release.
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Install requirements
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--------------------
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> **Note**
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>
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> At the moment the native layer is only available on Linux. If you are
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> in a platform other than Linux the native compilation will not work
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The native library uses
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[autoconf](http://en.wikipedia.org/wiki/Autoconf) what makes the
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compilation process easy, however you need to install extra packages as
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a requirement for compilation:
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- gcc - C Compiler
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- gcc-c++ or g++ - Extension to gcc with support for C++
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- autoconf - Tool for automating native build process
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- make - Plain old make
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- automake - Tool for automating make generation
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- libtool - Tool for link editing native libraries
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- libaio - library to disk asynchronous IO kernel functions
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- libaio-dev - Compilation support for libaio
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- A full JDK installed with the environment variable JAVA\_HOME set to
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its location
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To perform this installation on RHEL or Fedora, you can simply type this
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at a command line:
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sudo yum install automake libtool autoconf gcc-c++ gcc libaio libaio-devel make
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Or on Debian systems:
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sudo apt-get install automake libtool autoconf gcc-g++ gcc libaio libaio-dev make
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> **Note**
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>
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> You could find a slight variation of the package names depending on
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> the version and Linux distribution. (for example gcc-c++ on Fedora
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> versus g++ on Debian systems)
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Invoking the compilation
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------------------------
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In the distribution, in the `native-src` directory, execute the shell
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script `bootstrap`. This script will invoke `automake` and `make` what
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will create all the make files and the native library.
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someUser@someBox:/messaging-distribution/native-src$ ./bootstrap
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checking for a BSD-compatible install... /usr/bin/install -c
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checking whether build environment is sane... yes
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checking for a thread-safe mkdir -p... /bin/mkdir -p
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...
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configure: creating ./config.status
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config.status: creating Makefile
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config.status: creating ./src/Makefile
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config.status: creating config.h
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config.status: config.h is unchanged
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config.status: executing depfiles commands
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config.status: executing libtool commands
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...
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The produced library will be at
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`./native-src/src/.libs/libActiveMQAIO.so`. Simply move that file over
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`bin` on the distribution or the place you have chosen on the [library
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path](#using-server.library.path).
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If you want to perform changes on the ActiveMQ libaio code, you could
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just call make directly at the `native-src` directory.
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