通过Python获取系统iops示例代码的方法

#!/usr/bin/python

import os, time, math

run_tests = 3

devices = os.listdir('/sys/block/')
check_devices = []

reads = {}
writes = {}

for dev in devices:
  if dev.startswith('md') or dev.startswith('sd') or dev.startswith('hd'):
    check_devices.append(dev)
    reads[dev] = []
    writes[dev] = []

check_devices = sorted(check_devices)

for t in range(run_tests + 1):
  for dev in check_devices:
    file_data = open('/sys/block/%s/stat' % dev).readline().strip().split(' ')
    clean = []
    for num in file_data:
      if num != '':
        clean.append(int(num))

    reads[dev].append(clean[0])
    writes[dev].append(clean[4])
  print reads[dev]
  print writes[dev]

  time.sleep(1)



print "Device  Read  Write"
print "--------------------------------------"
for dev in check_devices:
  clean_reads = []
  reads[dev].reverse()
  for test, result in enumerate(reads[dev]):
    if test > 0:
      clean_reads.append(float(reads[dev][test - 1] - result))

  rops = int(math.ceil(sum(clean_reads) / len(clean_reads)))

  clean_writes = []
  writes[dev].reverse()
  for test, result in enumerate(writes[dev]):
    if test > 0:
      clean_writes.append(float(writes[dev][test - 1] - result))

  wops = int(math.ceil(sum(clean_writes) / len(clean_writes)))

  print "%s %s %s" % (dev.ljust(13), repr(rops).ljust(11), repr(wops))