1#!/usr/bin/env python 2# 3# Copyright 2017 - The Android Open Source Project 4# 5# Licensed under the Apache License, Version 2.0 (the "License"); 6# you may not use this file except in compliance with the License. 7# You may obtain a copy of the License at 8# 9# http://www.apache.org/licenses/LICENSE-2.0 10# 11# Unless required by applicable law or agreed to in writing, software 12# distributed under the License is distributed on an "AS IS" BASIS, 13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14# See the License for the specific language governing permissions and 15# limitations under the License. 16 17from metrics.metric import Metric 18 19 20class RamMetric(Metric): 21 22 COMMAND = "free -m" 23 # Fields for response dictionary 24 TOTAL = 'total' 25 USED = 'used' 26 FREE = 'free' 27 BUFFERS = 'buffers' 28 CACHED = 'cached' 29 30 def gather_metric(self): 31 """Finds RAM statistics in MB 32 33 Returns: 34 A dict with the following fields: 35 total: int representing total physical RAM available in MB 36 used: int representing total RAM used by system in MB 37 free: int representing total RAM free for new process in MB 38 buffers: total RAM buffered by different applications in MB 39 cached: total RAM for caching of data in MB 40 """ 41 # Run shell command 42 result = self._shell.run(self.COMMAND) 43 # Example stdout: 44 # total used free shared buffers cached 45 # Mem: 64350 34633 29717 556 1744 24692 46 # -/+ buffers/cache: 8196 56153 47 # Swap: 65459 0 65459 48 49 # Get only second line 50 output = result.stdout.splitlines()[1] 51 # Split by space 52 fields = output.split() 53 # Create response dictionary 54 response = { 55 self.TOTAL: int(fields[1]), 56 self.USED: int(fields[2]), 57 self.FREE: int(fields[3]), 58 # Skip shared column, since obsolete 59 self.BUFFERS: int(fields[5]), 60 self.CACHED: int(fields[6]), 61 } 62 return (response) 63