Ganglia metrics module that reads InfiniBand (mlx4/5) counters

A CMake build system is included with the package. Several variables should be specified to enable CMake to find the Ganglia metrics build infrastructure, etc.

• APR_ROOT_DIR: install prefix for apr-1 library
• LIBCONFUSE_ROOT_DIR: install prefix for the Confuse configuration file library
• GANGLIA_ROOT_DIR: install prefix for the Ganglia software
• GANGLIA_BUILD_ROOT_DIR: path to the directory used to build Ganglia (for finding libmetrics infrastructure)

If GANGLIA_BUILD_ROOT_DIR is not provided it is inferred to be ${GANGLIA_ROOT_DIR}/src. So for a typical install we do in /opt/shared/ganglia/<version> with source in /opt/shared/ganglia/<version>/src and APR and Confuse present in the OS:

$ mkdir build
$ cd build
$ cmake -DGANGLIA_ROOT_DIR=/opt/shared/ganglia/3.7.2 ..
-- The C compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Found APR: /usr/include/apr-1 (found version "1.4.8") 
-- Found libconfuse: /usr/include  
-- Found Ganglia: /opt/shared/ganglia/3.7.2/include  
-- Found GangliaMetric: /opt/shared/ganglia/3.7.2/src/libmetrics  
-- Configuring done
-- Generating done
-- Build files have been written to: /opt/shared/ganglia/add-ons/ganglia-ibcounters/build

The completed metrics module will be installed to the lib/ganglia or lib64/ganglia subdirectory of the GANGLIA_ROOT_DIR.

An example module configuration file, ibcounters.conf, is included. We install it in /etc/ganglia/conf.d.