DFC project is a file cache software designed for faster access to frequently used files.
DFC project is a specialized file cache software that has been developed from DCS (Directory Content Service). It was created as an experimental service to allow data access through the shared memory mechanism of SysV IPC by Kevin M. Liang. DFC and DCS have both been extensively used and sponsored by him in a high-volume webserver environment.
DFC works by examining its configuration file for the list of directories; it then loads all regular files in these directories into shared memory areas. To access these cache files, programs utilize ftok(). The owner and group of the area are set after the original file, and the permissions are set at 0440.
Prior to accessing the shared memory areas, programs must first read the size of sizeof(off_t) bytes of the area to determine its full length, which is represented as:
0123................... |-T-|-------L---------|
T = L + sizeof(T)
To use this software, you need to have IPC support compiled into your kernel. In the latest update, permissions on the pidfile have been fixed.
Overall, DFC project is an efficient and reliable file cache solution that can help improve the performance of busy webserver environments.
DFC works by examining its configuration file for the list of directories; it then loads all regular files in these directories into shared memory areas. To access these cache files, programs utilize ftok(). The owner and group of the area are set after the original file, and the permissions are set at 0440.
Prior to accessing the shared memory areas, programs must first read the size of sizeof(off_t) bytes of the area to determine its full length, which is represented as:
0123................... |-T-|-------L---------|
T = L + sizeof(T)
To use this software, you need to have IPC support compiled into your kernel. In the latest update, permissions on the pidfile have been fixed.
Overall, DFC project is an efficient and reliable file cache solution that can help improve the performance of busy webserver environments.
What's New
Version 0.5: N/A