The system
module provides functionality related to the system as a whole,
not just this process.
Returns the amount of free memory available to the system, in bytes.
Returns the total amount of memory in the system, in bytes.
Returns a high-resolution time in seconds. It is useful for measuring intervals but not for determining the current clock time.
Returns the system load average over 1, 5, and 15 minutes. The load average is the average number of jobs in the run queue.
Returns the number of seconds since the system booted.