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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 )