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dstatでディスクレイテンシ取るやつ
class dstat_plugin(dstat):
def __init__(self):
self.nick = ('latency',)
self.type = 'd'
self.width = 4
self.scale = 34
self.diskfilter = re.compile('^(dm-[0-9]+|md[0-9]+|[hs]d[a-z]+[0-9]+)$')
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 = []
blockdevices = [os.path.basename(filename) for filename in glob.glob('/sys/block/*')]
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 self.vars
def extract(self):
for name in self.vars: self.set2[name] = (0, 0, 0, 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[3]),
self.set2[name][1] + long(l[6]),
self.set2[name][2] + long(l[7]),
self.set2[name][3] + long(l[10]),
)
for name in self.set2.keys():
if len(self.set1[name]) == 4:
read_ios = self.set2[name][0] - self.set1[name][0]
read_ticks = self.set2[name][1] - self.set1[name][1]
write_ios = self.set2[name][2] - self.set1[name][2]
write_ticks = self.set2[name][3] - self.set1[name][3]
total_ios = read_ios + write_ios
total_ticks = read_ticks + write_ticks
if total_ios > 0:
self.val[name] = (total_ticks / total_ios, )
else:
self.val[name] = (0, )
else:
self.val[name] = (0, )
if step == op.delay:
self.set1.update(self.set2)
@buty4649

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buty4649 commented Nov 10, 2014

dstat_disk_util.pyを改造して作った

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buty4649 commented Nov 10, 2014

~/.dstat とかにいれて、 dstat --disk-latency とかすると動く

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buty4649 commented Nov 10, 2014

/proc/diskstats から取っているので単位はms
see. https://www.kernel.org/doc/Documentation/iostats.txt

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