This file contains information about the system load. The first three numbers represent the number of active tasks on the system - processes that are actually running - averaged over the last 1, 5, and 15 minutes. The next entry shows the instantaneous current number of runnable tasks - processes that are currently scheduled to run rather than being blocked in a system call - and the total number of processes on the system. The final entry is the process ID of the process that most recently ran.
0.55 0.47 0.43 1/210 12437