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# -*- coding: utf-8 -*- |
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__author__ = 'Kenny Freeman' |
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__email__ = '[email protected]' |
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__license__ = "ISCL" |
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__docformat__ = 'reStructuredText' |
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import re |
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import time |
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import traceback |
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import plumd |
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import plumd.plugins |
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from plumd.calc import Differential |
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from plumd.util import get_file_map |
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class DiskStats(plumd.plugins.Reader): |
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"""Plugin to measure various kernel metrics from /proc.""" |
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defaults = { |
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'poll.interval': 10, |
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'proc_path': '/proc', |
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'diskstats_dev_re': "dm-\d", |
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'diskstats_cols': ["r", "r_merge", "r_sector", "r_time", "w", "w_merge", |
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"w_sector", "w_time", "io_inprog", "io_time", |
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"io_weighted_time"] |
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} |
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def __init__(self, log, config): |
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"""Plugin to measure various kernel metrics from /proc. |
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:param log: A logger |
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:type log: logging.RootLogger |
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:param config: a plumd.config.Conf configuration helper instance. |
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:type config: plumd.config.Conf |
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""" |
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super(DiskStats, self).__init__(log, config) |
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config.defaults(DiskStats.defaults) |
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self.calc = Differential() |
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self.proc_file = fname = "{0}/diskstats".format(config.get('proc_path')) |
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self.diskstats_dev_re = re.compile(config.get('diskstats_dev_re')) |
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self.diskstats_cols = self.config.get('diskstats_cols') |
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def poll(self): |
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"""Poll for kernel metrics under /proc. |
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:rtype: ResultSet |
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""" |
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return plumd.ResultSet(self.check()) |
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def check(self): |
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"""Return disk io metrics from proc file diskstats. |
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:rtype: plumd.Result |
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""" |
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# times in ms |
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cols = self.diskstats_cols |
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result = plumd.Result("diskstats") |
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dat = {} |
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# read and process /proc/stat |
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try: |
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dat = get_file_map(self.proc_file, 2, 0) |
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except Exception as e: |
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tb = traceback.format_exc() |
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self.log.error("proc_diskstats: exception: {0}: {1}".format(e, tb)) |
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return result |
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ts = time.time() |
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for key, val in dat.items(): |
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if self.diskstats_dev_re.match(key): |
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continue |
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for mname in cols: |
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mval = int(val.popleft()) |
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mstr = "{0}.{1}".format(key, mname) |
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dval = self.calc.per_second(mstr, mval, ts) |
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result.add(plumd.Int(mstr, dval)) |
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return [result] |
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s4z /
plumd
