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### Author: Dag Wieers <dag$wieers,com>
class dstat_plugin(dstat):
"""
Percentage of bandwidth utilization for block devices.
Displays percentage of CPU time during which I/O requests were issued
to the device (bandwidth utilization for the device). Device saturation
occurs when this value is close to 100%.
"""
def __init__(self):
self.nick = ('util', )
self.type = 'f'
self.width = 4
self.scale = 34
self.diskfilter = re.compile('^(dm-\d+|md\d+|[hsv]d[a-z]+\d+)$')
self.open('/proc/diskstats')
self.cols = 1
def discover(self, *objlist):
ret = []
for l in self.splitlines():
if len(l) < 13: continue
if l[3:] == ['0',] * 11: continue
name = l[2]
ret.append(name)
for item in objlist: ret.append(item)
if not ret:
raise Exception, "No suitable block devices found to monitor"
return ret
def vars(self):
ret = []
if op.disklist:
varlist = op.disklist
else:
varlist = []
for name in self.discover:
if self.diskfilter.match(name): continue
if name not in blockdevices(): continue
varlist.append(name)
# if len(varlist) > 2: varlist = varlist[0:2]
varlist.sort()
for name in varlist:
if name in self.discover:
ret.append(name)
return ret
def name(self):
return [sysfs_dev(name) for name in self.vars]
def extract(self):
for name in self.vars: self.set2[name] = (0, )
for l in self.splitlines():
if len(l) < 13: continue
if l[5] == '0' and l[9] == '0': continue
name = l[2]
if l[3:] == ['0',] * 11: continue
if name in self.vars:
self.set2[name] = ( self.set2[name][0] + long(l[12]), )
for name in self.set2.keys():
self.val[name] = (
(self.set2[name][0] - self.set1[name][0]) * 1.0 * hz / elapsed / 1000,
)
if step == op.delay:
self.set1.update(self.set2)