计算CPU 百分比

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def get_vm_cpu_rate(self, uuid):
"""
get cpu rate
100 * diff_vm_cpu_time / (diff_sys_cpu_time * 1 * 1e9)
return cpurate%
"""
result = 0
vm_info = self.vms_info.get(uuid, None)
vm_info_before = self.vms_info_before.get(uuid, None)
if not vm_info or not vm_info_before:
return result
info = vm_info.get("cpu_mem_state_info", None)
info_before = vm_info_before.get("cpu_mem_state_info", None)
cpu_time = info[-1]
cpu_time_before = info_before[-1]
last = self.vms_info_timestamp
before = self.vms_info_before_timestamp
if cpu_time and cpu_time_before:
result = 100 * abs(cpu_time_before - cpu_time) / \
(abs(last - before) * 1 * 1e9)
return round(result, 2)