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class dstat_plugin(dstat):
"""
ZFS on Linux L2ARC (Level 2 Adjustable Replacement Cache)
Data is extracted from /proc/spl/kstat/zfs/arcstats
"""
def __init__(self):
self.name = 'ZFS L2ARC'
self.nick = ('size', 'hit', 'miss', 'hit%', 'read', 'write')
self.vars = ('l2_size', 'l2_hits', 'l2_misses', 'hit_rate', 'l2_read_bytes', 'l2_write_bytes')
self.types = ('b', 'd', 'd', 'p', 'b', 'b')
self.scales = (1024, 1000, 1000, 1000, 1024, 1024)
self.counter = (False, True, True, False, True, True)
self.open('/proc/spl/kstat/zfs/arcstats')
def extract(self):
for l in self.splitlines():
if len(l) < 2: continue
l[0].split()
name = l[0]
if name in self.vars:
self.set2[name] = long(l[2])
for i, name in enumerate (self.vars):
if self.counter[i]:
self.val[name] = (self.set2[name] - self.set1[name]) * 1.0 / elapsed
else:
self.val[name] = self.set2[name]
probes = self.val['l2_hits'] + self.val['l2_misses']
if probes > 0 :
self.val['hit_rate'] = self.val['l2_hits'] / probes * 100.0
else:
self.val['hit_rate'] = 0
if step == op.delay:
self.set1.update(self.set2)
# vim:ts=4:sw=4:et
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