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### Author: David Nicklay <david-d$nicklay,com>
### Modified from disk-util: Dag Wieers <dag$wieers,com>
class dstat_plugin(dstat):
"""
Read and Write average wait times of block devices.
Displays the average read and write wait times of block devices
"""
def __init__(self):
self.nick = ('rawait', 'wawait')
self.type = 'f'
self.width = 4
self.scale = 1
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 = 1
self.struct = dict( rd_ios=0, wr_ios=0, rd_ticks=0, wr_ticks=0 )
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)
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 l in self.splitlines():
if len(l) < 13: continue
if l[5] == '0' and l[9] == '0': continue
if l[3:] == ['0',] * 11: continue
name = l[2]
if name not in self.vars: continue
self.set2[name] = dict(
rd_ios = int(l[3]),
wr_ios = int(l[7]),
rd_ticks = int(l[6]),
wr_ticks = int(l[10]),
)
for name in self.vars:
rd_tput = self.set2[name]['rd_ios'] - self.set1[name]['rd_ios']
wr_tput = self.set2[name]['wr_ios'] - self.set1[name]['wr_ios']
if rd_tput:
rd_wait = ( self.set2[name]['rd_ticks'] - self.set1[name]['rd_ticks'] ) * 1.0 / rd_tput
else:
rd_wait = 0
if wr_tput:
wr_wait = ( self.set2[name]['wr_ticks'] - self.set1[name]['wr_ticks'] ) * 1.0 / wr_tput
else:
wr_wait = 0
self.val[name] = ( rd_wait, wr_wait )
if step == op.delay:
self.set1.update(self.set2)
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