libdirectio

Disable the filesystem buffer cache by preloading this library.1

To compile the library simply run make. You can pre-load it using the LD_PRELOAD environment variable in this way:

# export LD_PRELOAD=$FULL_PATH_OF_YOUR_LIBRARY/libdirectio.so.0.1

Then you can run your brand-new direct I/O benchmark (typically dd) for block devices.

To unload the library and restore the standard access simply run:

# unload LD_PRELOAD