This folder has the source code for both the cp -r implementation,
using both the POSIX AIO and the kernel AIO.
Requirements
------------
* g++ version >= 4.8
* python 2.7 (to generate workloads)
* libaio
* librt
Compiling the source
---------------------
Run make in the given folder. This should generate two executables in the same folder:
posix-cp and kernel-cp
To run cp -r with kernel AIO :
./kernel-cp <source> <destination>
To run cp -r for POSIX AIO :
./posix-cp <source> <destination>
To remove executables :
make clean
Generating Workloads
---------------------
To automatically set up a directory tree with required depth and for particular file size(in KB).
1) Create the root of the directory tree
mkdir <root>
2) python workload.py <root> <num_files> <depth> <file_size>
Notes
-----
* The kernel-cp will currently work only for file-sizes that are multiples of the block
size. This is a restriction of using the O_DIRECT flag.
* If your kernel-cp fails with EAGAIN, you may need to increase the queue size via
1) echo 131072 > /proc/sys/fs/aio-max-nr
2) Change the Q_MAX defined at the top of kernel-cp.c to 65536