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# -*- coding: utf-8 -*- |
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"""Reader plugin to record vmstat metrics from /proc on linux.""" |
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import time |
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import plumd |
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from plumd.util import Differential |
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from plumd.util import get_file_list |
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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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class VmStat(plumd.Reader): |
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"""Plugin to measure various kernel metrics from /proc/vmstat.""" |
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defaults = { |
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'poll.interval': 10, |
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'proc_path': '/proc', |
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# awk '{ print "\"" $1 "\"," }' /proc/vmstat |
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'proc_vmstat_gauges': ["nr_free_pages", "nr_dirtied", "nr_written", |
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"numa_hit", "numa_miss", "numa_foreign", |
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"numa_interleave", "numa_local", "numa_other", |
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"pgpgin", "pgpgout", "pswpin", "pswpout", |
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"pgalloc_dma", "pgalloc_dma32", "pgalloc_normal", |
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"pgalloc_movable", "pgfree", "pgactivate", |
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"pgdeactivate", "pgfault", "pgmajfault", |
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"slabs_scanned", "kswapd_inodesteal", |
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"kswapd_low_wmark_hit_quickly", |
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"kswapd_high_wmark_hit_quickly", |
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"drop_pagecache", "drop_slab", |
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"numa_pte_updates", "numa_huge_pte_updates", |
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"numa_hint_faults", "numa_hint_faults_local", |
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"numa_pages_migrated", "pgmigrate_success", |
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"pgmigrate_fail", "compact_migrate_scanned", |
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"compact_free_scanned", "compact_isolated", |
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"compact_stall", "compact_fail", |
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"compact_success"], |
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'proc_vmstat_rates': [] |
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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/vmstat. |
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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(VmStat, self).__init__(log, config) |
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self.config.defaults(VmStat.defaults) |
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self.calc = Differential() |
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self.proc_file = "{0}/vmstat".format(config.get('proc_path')) |
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self.gauges = self.config.get('proc_vmstat_gauges') |
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self.rates = self.config.get('proc_vmstat_rates') |
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def poll(self): |
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"""Poll for kernel metrics under proc file vmstat. |
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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 metrics from /proc/vmstat. |
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:rtype: plumd.Result |
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""" |
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# what metrics do we want to record? |
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result = plumd.Result("vmstat") |
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# read the proc file |
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dat = {} |
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with open(self.proc_file, 'r') as f: |
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# get a list of values: metric, val, metric, val, etc |
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vals = f.read().strip().split() |
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# every second item starting at 0, every second item starting at 1 |
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# take that and put into a dict |
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dat = dict(zip(vals[0::2], vals[1::2])) |
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# timestamp for Differential calculations |
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ts = time.time() |
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# now, we have a list of items to record, just need to record them |
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for i, metric in enumerate(self.gauges): |
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if metric in dat: |
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result.add(plumd.Int(metric, dat[metric])) |
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else: |
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self.log.warn("vmstat: unknown metric {0}".format(metric)) |
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del(self.gauges[i]) |
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# and the rates as well, if any |
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for i, metric in enumerate(self.rates): |
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if metric in dat: |
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mval = self.calc.per_second(metric, int(dat[metric]), ts) |
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result.add(plumd.Float(metric, mval)) |
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else: |
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self.log.warn("vmstat: unknown metric {0}".format(metric)) |
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del(self.rates[i]) |
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return [result] |
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s4z /
plumd
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