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### Author: Dag Wieers <dag$wieers,com>
class dstat_plugin(dstat):
"""
Percentage of bandwidth utilization for block devices.
Displays percentage of CPU time during which I/O requests were issued
to the device (bandwidth utilization for the device). Device saturation
occurs when this value is close to 100%.
"""
def __init__(self):
self.nick = ('util', )
self.type = 'f'
self.width = 4
self.scale = 34
self.diskfilter = re.compile('^([hsv]d[a-z]+\d+|cciss/c\d+d\d+p\d+|dm-\d+|md\d+|mmcblk\d+p\d0|VxVM\d+)$')
self.open('/proc/diskstats')
self.cols = 1
self.struct = dict( tot_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 basename(self, disk):
"Strip /dev/ and convert symbolic link"
if disk[:5] == '/dev/':
# file or symlink
if os.path.exists(disk):
# e.g. /dev/disk/by-uuid/15e40cc5-85de-40ea-b8fb-cb3a2eaf872
if os.path.islink(disk):
target = os.readlink(disk)
# convert relative pathname to absolute
if target[0] != '/':
target = os.path.join(os.path.dirname(disk), target)
target = os.path.normpath(target)
print('dstat: symlink %s -> %s' % (disk, target))
disk = target
# trim leading /dev/
return disk[5:]
else:
print('dstat: %s does not exist' % disk)
else:
return disk
def vars(self):
ret = []
if op.disklist:
varlist = list(map(self.basename, 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 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(
tot_ticks = int(l[12])
)
for name in self.vars:
self.val[name] = ( (self.set2[name]['tot_ticks'] - self.set1[name]['tot_ticks']) * 1.0 * hz / elapsed / 1000, )
if step == op.delay:
self.set1.update(self.set2)
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