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### Author: Dag Wieers <dag@wieers.com>
class dstat_plugin(dstat):
"""
Top most expensive I/O process
Displays the name of the most expensive I/O process
"""
def __init__(self):
self.name = 'most expensive'
self.vars = ('i/o process',)
self.type = 's'
self.width = 22
self.scale = 0
self.pidset1 = {}
def check(self):
if not os.access('/proc/self/io', os.R_OK):
raise Exception, 'Kernel has no per-process I/O accounting, use at least 2.6.20'
def extract(self):
self.output = ''
self.pidset2 = {}
self.val['usage'] = 0.0
for pid in proc_pidlist():
try:
### Reset values
if not self.pidset2.has_key(pid):
self.pidset2[pid] = {'rchar:': 0, 'wchar:': 0}
if not self.pidset1.has_key(pid):
self.pidset1[pid] = {'rchar:': 0, 'wchar:': 0}
### Extract name
name = proc_splitline('/proc/%s/stat' % pid)[1][1:-1]
### Extract counters
for l in proc_splitlines('/proc/%s/io' % pid):
if len(l) != 2: continue
self.pidset2[pid][l[0]] = int(l[1])
except IOError:
continue
except IndexError:
continue
read_usage = (self.pidset2[pid]['rchar:'] - self.pidset1[pid]['rchar:']) * 1.0 / elapsed
write_usage = (self.pidset2[pid]['wchar:'] - self.pidset1[pid]['wchar:']) * 1.0 / elapsed
usage = read_usage + write_usage
# if usage > 0.0:
# print '%s %s:%s' % (pid, read_usage, write_usage)
### Get the process that spends the most jiffies
if usage > self.val['usage']:
self.val['usage'] = usage
self.val['read_usage'] = read_usage
self.val['write_usage'] = write_usage
self.val['pid'] = pid
self.val['name'] = getnamebypid(pid, name)
if step == op.delay:
self.pidset1 = self.pidset2
if self.val['usage'] != 0.0:
self.output = '%-*s%s %s' % (self.width-11, self.val['name'][0:self.width-11], cprint(self.val['read_usage'], 'd', 5, 1024), cprint(self.val['write_usage'], 'd', 5, 1024))
### Debug (show PID)
# self.output = '%*s %-*s%s %s' % (5, self.val['pid'], self.width-17, self.val['name'][0:self.width-17], cprint(self.val['read_usage'], 'd', 5, 1024), cprint(self.val['write_usage'], 'd', 5, 1024))
def showcsv(self):
return '%s / %d:%d' % (self.val['name'], self.val['read_usage'], self.val['write_usage'])
# vim:ts=4:sw=4:et
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