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dstat_disk_util.py
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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)