--- 1. Quick start guide
There is no need to configure or CMake.
You may need to change the CXX command in Makefile.include.
Then do the following.

To run the serial FMM example:
cd examples
make serial

To run the parallel FMM example:
cd examples
make parallel

To run the GROMACS wrapper example:
cd wrapper
make gromacs

To get the list of command line options:
./a.out --help

--- 2. Where are the important files?
Most of the source code is in the directory "include" in the form of header files.
Different versions of P2M,M2M,M2L,L2L,L2P,P2P kernel implementations are in "kernels".
File names and variable names are self-explanatory, and every line is commented.
The best documentation is most likely the code itself.

--- 3. What's in the directory "gpu"?
"gpu" is a completely independent code at the moment.
It will be integrated into the main code soon.
To run it:
cd gpu

--- 4. What's in Makefile.include?
This file is included from each Makefile in all subdirectories.
Most options of exafmm can be controlled from this file.

EQUATION : Type of equation to solve
BASIS : Type of multipole/local expansion basis
CXX : Type of compiler and options
LFLAGS : Linker options and preprocessor options (see comments)

--- 5. Why is there a CMakeLists.txt?
This project is not yet large enough to justify the use of CMake,
but we are just testing a few features of CMake.
You probably don't want to use this feature.

--- 6. Available features
Contorl both P and theta
Error optimization of theta
Mutual interaction for both P2P and M2L kernels
Laplace kernel
Cartesian, Spherical expansions
Dual tree traversal
Periodic boundary condition
Kahan summation
Task based threading with TBB, MTHREADS, and OpenMP
SIMD intrinsics for SSE, AVX, MIC, BG/Q, and SPARC

-- 7. Features that were removed
Skipping dipoles