-r Report memory and swap space utilization statistics
-x { pid | SELF | ALL } Report statistics for a given process. pid is the process identification number. The SELF keyword indicates that statistics are to be reported for the sar process itself, whereas the ALL keyword indicates that statistics are to be reported for all the system processes. All these statistics cannot be saved to a file. So this option will be ignored whenever -o option is used. Specifying multiple -x pid parameters on the command line will look at multiple independent processes. At the present time, no more than 256 processes can be monitored simultaneously.
-X { pid | SELF | ALL } Report statistics for the child processes of the process whose PID is pid . The SELF keyword indicates that statistics are to be reported for the child processes of the sar process itself, whereas the ALL keyword indicates that statistics are to be reported for all the child processes of all the system processes. All these statistics cannot be saved to a file. So this option will be ignored whenever -o option is used. Specifying multiple -X pid parameters on the command line will look at multiple independent processes. At the present time, no more than 256 processes can be monitored simultaneously.