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### Author: Dag Wieers <dag$wieers,com>
class dstat_plugin(dstat):
"""
Number of read and write transactions per device.
Displays the number of read and write I/O transactions per device.
"""
def __init__(self):
self.nick = ('#read', '#writ' )
self.type = 'd'
self.width = 5
self.scale = 1000
self.diskfilter = re.compile('^([hsv]d[a-z]+\d+|cciss/c\d+d\d+p\d+|dm-\d+|md\d+|mmcblk\d+p\d0|VxVM\d+)$')
self.open('/proc/diskstats')
self.cols = 2
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
elif not op.full:
varlist = ('total',)
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 + ['total'] or name in op.diskset:
ret.append(name)
return ret
def name(self):
return ['dsk/'+sysfs_dev(name) for name in self.vars]
def extract(self):
for name in self.vars: self.set2[name] = (0, 0)
for l in self.splitlines():
if len(l) < 13: continue
if l[3] == '0' and l[7] == '0': continue
if l[3:] == ['0',] * 11: continue
name = l[2]
if not self.diskfilter.match(name):
self.set2['total'] = ( self.set2['total'][0] + int(l[3]), self.set2['total'][1] + int(l[7]) )
if name in self.vars and name != 'total':
self.set2[name] = ( self.set2[name][0] + int(l[3]), self.set2[name][1] + int(l[7]))
for diskset in self.vars:
if diskset in op.diskset:
for disk in op.diskset[diskset]:
if re.match('^'+disk+'$', name):
self.set2[diskset] = ( self.set2[diskset][0] + int(l[3]), self.set2[diskset][1] + int(l[7]) )
for name in self.set2:
self.val[name] = list(map(lambda x, y: (y - x) / elapsed, self.set1[name], self.set2[name]))
if step == op.delay:
self.set1.update(self.set2)
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