# Faiyaz Ahmed <faiyaza@cs.princeton.edu>
# Copyright (C) 2004-2006 The Trustees of Princeton University
#
-# $Id: swapmon.py,v 1.11 2006/12/02 19:11:47 mlhuang Exp $
+# $Id$
#
import syslog
import socket
import time
-# util-vserver/python/vserver.py allows us to control slices directly
-# from Python
-from vserver import VServer
-
# bwlimit exports a few useful functions like run(), get_xid(), and get_slice()
import bwlimit
# Defaults
debug = False
verbose = 0
-datafile = "/var/lib/misc/swapmon.dat"
-
+DATAFILE = "/var/lib/misc/swapmon.dat"
+VERSION = "$Id$"
# Seconds between process analysis
period = 30
# Swap utilization at which the machine is rebooted
reboot_thresh = 95
-# Time to wait before checking slice again after reset
-reset_timeout = 15
-
-# Number of strikes before killing (strike, strike, kill)
-kill_thresh = 2
-
-# Time to wait before removing slice from kill queue (probation)
-kill_timeout = 120
-
# Don't email the same message more than once in the same emailtimeout interval
email_timeout = 1800
%(date)s %(hostname)s reboot
""".lstrip()
-# Message sent after a hog is reset
-reset_subject = "pl_mom reset slice %(slice)s on %(hostname)s"
-reset_body = \
-"""
-Sometime before %(date)s, swap space was
-nearly exhausted on %(hostname)s.
-
-Slice %(slice)s was reset since it was the largest consumer of
-physical memory at %(rss)s (%(percent)4.1f%%) (%(sz)s writable).
-
-Please reply to this message explaining the nature of your experiment,
-and what you are doing to address the problem.
-
-%(slice)s processes prior to reset:
-
-%(table)s
-
-%(date)s %(hostname)s reset %(slice)s
-""".lstrip()
-
# Message sent to system slices that should not be reset
alarm_subject = "pl_mom alarm slice %(slice)s on %(hostname)s"
alarm_body = \
%(date)s %(hostname)s reset %(slice)s
""".lstrip()
+def killsliverprocs(xid):
+ bwlimit.run("/usr/sbin/vkill -s 9 -c %s 0" % xid)
-class Reset:
- """
- Keeps track of state information for resets and kills
-
- resettimeleft - timeout before checking for next reset
- resetcount - number of strikes
- killtimeleft - time out before removing from kill queue
- {kill,reset}mail - Time of last email
- kill - State of kill. If slice is already being killed, wait before retry.
- """
-
- def __init__(self,name):
- self.name = name
- self.resettimeleft = reset_timeout
- self.resetcount = 0
- self.resetmail = 0
- self.killtimeleft = kill_timeout
- self.killmail = 0
-
- def __repr__(self):
- return self.name
-
- def update(self):
- # Count down for next check of reset slice.
- if self.resettimeleft > 0:
- self.resettimeleft -= 1
- if debug and verbose: print "%s has %s seconds in probation" \
- %(self.name, self.killtimeleft)
- if self.killtimeleft > 0:
- # Count down kill probation timer (killtimeleft)
- self.killtimeleft -= 1
- if self.killtimeleft == 1:
- print "%s is out of probation" % self.name
- else:
- # Once out of probation period (killtimeleft), remove strikes
- self.resetcount = 0
-
-
- # Check to see if a slice needs to be killed. If it has been killed more
- # than kill_thresh in the probation period (kill_timeout) send an email, kill the slice.
- def checkkill(self,params):
- if self.killtimeleft > 0 and self.resetcount >= kill_thresh:
- if debug:
- print kill_subject % params
- print kill_body % params
- try:
- pid = os.fork()
- if pid == 0:
- print "Slice %s is being killed." % self.name
- vserver = VServer(self.name)
- vserver.stop()
- os._exit(0)
- else:
- os.waitpid(pid,0)
- except Exception, err:
- print "Warning: Exception received while killing slice %s: %s" \
- % (self.name, err)
- if (time.time() - self.killmail) > email_timeout:
- slicemail(self.name, kill_subject % params, kill_body % params)
- print "Sending KILL email for slice %s" % self.name
- self.killmail = time.time()
- return True
- return False
-
- # Reset slice after checking to see if slice is out of timeout.
- # Increment resetcount, check to see if larger than kill_thresh.
- def reset(self, params):
- # If its the first reset (came back after kill)
- # or if its been reset before
- # and we are out of the reset timeout.
- if self.resetcount == 0 or self.resettimeleft == 0:
- # Do we need to kill this slice? Check history first.
- if self.checkkill(params): return
- # Update counters
- self.resetcount += 1
- self.killtimeleft = kill_timeout
- self.resettimeleft = reset_timeout
- print "%s has %s seconds to die and has been reset %s times" \
- %(self.name, self.resettimeleft, self.resetcount)
- if debug:
- print reset_subject % params
- print reset_body % params
- try:
- pid = os.fork()
- if pid == 0:
- print "Resetting slice " + self.name
- vserver = VServer(self.name)
- vserver.stop()
- vserver.start(wait = False)
- os._exit(0)
- else:
- os.waitpid(pid,0)
- except Exception, err:
- print "Warning: Exception received while resetting slice %s:" \
- % self.name, err
- if (time.time() - self.resetmail) > email_timeout:
- slicemail(self.name, reset_subject % params, reset_body % params)
- print "Sending Reset email for slice %s" % self.name
- self.resetmail = time.time()
-
def usage():
print """
Usage: %s [OPTIONS]...
--system-slice=SLICE System slice that should not be reset
--status Print memory usage statistics and exit
-h, --help This message
-""".lstrip() % (sys.argv[0], debug, verbose, datafile, format_period(period))
+""".lstrip() % (sys.argv[0], debug, verbose, DATAFILE, format_period(period))
def slicestat(names = None):
"""
Get status of specified slices (if names is None or empty, all
slices). vsize, sz, and rss are in KiB. Returns
-
+ PID CONTEXT VSZ SZ RSS %MEM CMD
{xid: {'xid': slice_id,
- 'name': slice_name,
- 'procs': [{'pid': pid, 'xid': slice_id, 'user', username, 'cmd': command,
+ 'name': slice_name,
+ 'procs': [{'pid': pid, 'xid': slice_id, 'cmd': command,
'vsize': virtual_kib, 'sz': potential_kib, 'rss': physical_kib,
'pcpu': cpu_percent, 'pmem': mem_percent}]
- 'vsize': total_virtual_kib,
- 'sz': total_potential_kib,
- 'rss': total_physical_kib}}
+ 'vsize': total_virtual_kib,
+ 'sz': total_potential_kib,
+ 'rss': total_physical_kib}}
"""
# Mandatory fields. xid is a virtual field inserted by vps. Make
# sure cmd is last so that it does not get truncated
# automatically.
- fields = ['pid', 'xid', 'user', 'vsize', 'sz', 'rss', 'pcpu', 'pmem', 'cmd']
+ fields = ['pid', 'xid', 'vsize', 'sz', 'rss', 'pmem', 'cmd']
# vps inserts xid after pid in the output, but ps doesn't know
# what the field means.
# Eat the header line. vps depends on the header to figure out
# which column is the PID column, so we can't just tell ps not to
# print it.
- for line in bwlimit.run("/usr/sbin/vps -e -o " + ",".join(ps_fields))[1:]:
+ for line in bwlimit.run("/usr/sbin/vps -e -o " + ":16,".join(ps_fields))[1:]:
# Chomp newline
line = line.strip()
except ValueError:
pass
- # vps sometimes prints ERR instead of a context ID if it
+ # vps sometimes prints ERR or the name of the slice
+ # instead of a context ID if it
# cannot identify the context of an orphaned (usually dying)
# process. Skip these processes.
- if type(proc['xid']) != int:
+ if (type(proc['xid']) != int) or (type(proc['vsize']) !=int):
continue
# Assign (pl_)sshd processes to slice instead of root
m = re.search(r"sshd: ([a-zA-Z_]+)", proc['cmd'])
+
if m is not None:
xid = bwlimit.get_xid(m.group(1))
if xid is not None:
proc['rss'] += 12
# Include additional page table overhead
- if proc['vsize'] > 4096:
- proc['rss'] += 4 * ((proc['vsize'] - 1) / 4096)
+ try:
+ if proc['vsize'] > 4096:
+ proc['rss'] += 4 * ((proc['vsize'] - 1) / 4096)
+ except: pass
if slices.has_key(proc['xid']):
slice = slices[proc['xid']]
slice['rss'] += proc['rss']
slices[proc['xid']] = slice
-
+
return slices
def memtotal():
"""
Returns total physical and swap memory on the system in KiB.
"""
-
mem = 0
swap = 0
-
meminfo = open("/proc/meminfo", "r")
for line in meminfo.readlines():
try:
elif name == "SwapTotal:":
swap = int(value)
meminfo.close()
-
return (mem, swap)
def swap_used():
"""
Returns swap utilization on the system as a whole percentage (0-100).
"""
-
total_swap = 0
total_used = 0
-
try:
swaps = open("/proc/swaps", "r")
# Eat header line
total_used += int(used)
except ValueEror, err:
pass
- except (IOError, KeyError), err:
- pass
+ except (IOError, KeyError), err: pass
- return 100 * total_used / total_swap
+ swapused = 100 * total_used / total_swap
+ if debug: print "%s percent swap used" % swapused
+ return swapused
def summary(slices = None, total_mem = None, total_swap = None):
"""
Return a summary of memory usage by slice.
"""
- if not slices:
- slices = slicestat()
+ if not slices: slices = slicestat()
slicelist = slices.values()
slicelist.sort(lambda a, b: b['sz'] - a['sz'])
if total_mem is None or total_swap is None:
100. * slice['rss'] / total_mem,
format_bytes(slice['sz'] * 1024, si = False),
100. * slice['sz'] / (total_mem + total_swap))
-
-
return table
+def formtable(slice, percent):
+ '''
+ Makes pretty message to email with human readable ps values.
+ '''
+ table = "%5s %10s %10s %10s %4s %4s %s\n\n" % \
+ ("PID", "VIRT", "SZ", "RES", '%CPU', '%MEM', 'COMMAND')
+ for proc in slice['procs']:
+ table += "%5s %10s %10s %10s %4.1f %s\n" % \
+ (proc['pid'],
+ format_bytes(proc['vsize'] * 1024, si = False),
+ format_bytes(proc['sz'] * 1024, si = False),
+ format_bytes(proc['rss'] * 1024, si = False),
+ proc['pmem'],
+ proc['cmd'])
+
+ prettytable = {'hostname': socket.gethostname(),
+ 'date': time.asctime(time.gmtime()) + " GMT",
+ 'table': table,
+ 'slice': slice['name'],
+ 'rss': format_bytes(slice['rss'] * 1024, si = False),
+ 'sz': format_bytes(slice['sz'] * 1024, si = False),
+ 'percent': percent}
+ return prettytable
+
+def readdat():
+ '''
+ Return dictionary of vps (slicestat) from datfile left behind by OOM
+ before rebooting. If none file, just grab the latest dict (slicestat)
+ and return that. If dat file found, means we rebooted, send an email to
+ pl_mom@pl.
+ '''
+ try:
+ f = open(DATAFILE, "r+")
+ if verbose:
+ print "Loading %s" % DATAFILE
+ (v, slices) = pickle.load(f)
+ f.close()
+ # Check version of data file
+ if v != VERSION:
+ print "Not using old version '%s' data file %s" % (v, DATAFILE)
+ raise Exception
+
+ params = {'hostname': socket.gethostname(),
+ 'date': time.asctime(time.gmtime()) + " GMT",
+ 'table': summary(slices, total_mem, total_swap)}
+ if debug:
+ print rebooted_subject % params
+ print rebooted_body % params
+ else:
+ slicemail(None, rebooted_subject % params, rebooted_body % params)
+
+ # Delete data file
+ os.unlink(DATAFILE)
+ except Exception:
+ slices = slicestat()
+
+ return slices
+
+
+def writedat(slices):
+ """
+ Write (slices) to pickled datfile.
+ """
+ if verbose: print "Saving %s" % DATAFILE
+ f = open(DATAFILE, "w")
+ pickle.dump((VERSION, slices), f)
+ f.close()
+
+
def main():
# Defaults
- global debug, verbose, datafile
+ global debug, verbose, DATAFILE, VERSION
global period, change_thresh, reset_thresh, reboot_thresh, rss_min, system_slices
# All slices
names = []
+ timer = period
+ last_used = None
+ used = None
+ warned = []
+ emailed = {}
try:
longopts = ["debug", "verbose", "file=", "slice=", "status", "help"]
elif opt == "-v" or opt == "--verbose":
verbose += 1
elif opt == "-f" or opt == "--file":
- datafile = optval
+ DATAFILE = optval
elif opt == "-s" or opt == "--slice":
names.append(optval)
elif opt == "-p" or opt == "--period":
# Get total memory
(total_mem, total_swap) = memtotal()
-
- try:
- f = open(datafile, "r+")
- if verbose:
- print "Loading %s" % datafile
- (version, slices) = pickle.load(f)
- f.close()
- # Check version of data file
- if version != "$Id: swapmon.py,v 1.11 2006/12/02 19:11:47 mlhuang Exp $":
- print "Not using old version '%s' data file %s" % (version, datafile)
- raise Exception
-
- params = {'hostname': socket.gethostname(),
- 'date': time.asctime(time.gmtime()) + " GMT",
- 'table': summary(slices, total_mem, total_swap)}
-
- if debug:
- print rebooted_subject % params
- print rebooted_body % params
- else:
- slicemail(None, rebooted_subject % params, rebooted_body % params)
-
- # Delete data file
- os.unlink(datafile)
- except Exception:
- version = "$Id: swapmon.py,v 1.11 2006/12/02 19:11:47 mlhuang Exp $"
- slices = {}
+ slices = readdat()
# Query process table every 30 seconds, or when a large change in
# swap utilization is detected.
- timer = period
- last_used = None
- used = None
-
- # System slices that we have warned but could not reset
- warned = []
-
- # Slices that were reset
- resetlist = {}
while True:
used = swap_used()
-
- for resetslice in resetlist.keys():
- resetlist[resetslice].update()
+ if last_used is None: last_used = used
+
+ if used >= reboot_thresh:
+ # Dump slice state before rebooting
+ writedat(slices)
+ # Goodbye, cruel world
+ print "%d%% swap consumed, rebooting" % used
+ if not debug: bwlimit.run("/bin/sync; /sbin/reboot -f")
+ elif used >= reset_thresh:
+ # Try and find a hog
+ slicelist = slices.values()
+ # Puts largest on top.
+ slicelist.sort(lambda a, b: b['rss'] - a['rss'])
+ for slice in slicelist:
+ percent = 100. * slice['rss'] / total_mem
+ if slice['rss'] < rss_min: continue
+ print "%d%% swap consumed, slice %s is using %s (%d%%) of memory" % \
+ (used,
+ slice['name'],
+ format_bytes(slice['rss'] * 1024, si = False),
+ percent)
+ slice['procs'].sort(lambda a, b: b['rss'] - a['rss'])
+ # Make a pretty table.
+ params = formtable(slice, percent)
+ # Match slice name against system slice patterns
+ is_system_slice = filter(None,
+ [re.match(pattern, slice['name']) for pattern in system_slices])
- if last_used is None:
- last_used = used
-
- if verbose:
- print "%d%% swap consumed" % used
-
- if used >= reboot_thresh:
- # Dump slice state before rebooting
- if verbose: print "Saving %s" % datafile
- f = open(datafile, "w")
- pickle.dump((version, slices), f)
- f.close()
-
- # Goodbye, cruel world
- print "%d%% swap consumed, rebooting" % used
- if not debug: bwlimit.run("/bin/sync; /sbin/reboot -f")
-
- elif used >= reset_thresh:
- if debug: print "Memory used = %s" %(used)
- # Try and find a hog
- slicelist = slices.values()
- slicelist.sort(lambda a, b: b['rss'] - a['rss'])
- for slice in slicelist:
- percent = 100. * slice['rss'] / total_mem
- if slice['rss'] < rss_min: continue
- print "%d%% swap consumed, slice %s is using %s (%d%%) of memory" % \
- (used,
- slice['name'],
- format_bytes(slice['rss'] * 1024, si = False),
- percent)
-
- slice['procs'].sort(lambda a, b: b['rss'] - a['rss'])
- table = "%5s %10s %10s %10s %4s %4s %s\n\n" % \
- ("PID", "VIRT", "SZ", "RES", '%CPU', '%MEM', 'COMMAND')
- for proc in slice['procs']:
- table += "%5s %10s %10s %10s %4.1f %4.1f %s\n" % \
- (proc['pid'],
- format_bytes(proc['vsize'] * 1024, si = False),
- format_bytes(proc['sz'] * 1024, si = False),
- format_bytes(proc['rss'] * 1024, si = False),
- proc['pcpu'],
- proc['pmem'],
- proc['cmd'])
-
- params = {'hostname': socket.gethostname(),
- 'date': time.asctime(time.gmtime()) + " GMT",
- 'table': table,
- 'slice': slice['name'],
- 'rss': format_bytes(slice['rss'] * 1024, si = False),
- 'sz': format_bytes(slice['sz'] * 1024, si = False),
- 'percent': percent}
-
- # Match slice name against system slice patterns
- is_system_slice = filter(None,
- [re.match(pattern, slice['name']) for pattern in system_slices])
-
- if is_system_slice:
# Do not reset system slices, just warn once
- if slice['name'] not in warned:
- warned.append(slice['name'])
- if debug:
- print alarm_subject % params
- print alarm_body % params
+ if is_system_slice:
+ if slice['name'] not in warned:
+ warned.append(slice['name'])
+ print "Warning slice " + slice['name']
+ if debug:
+ print alarm_subject % params
+ print alarm_body % params
+ else:
+ slicemail(slice['name'], alarm_subject % params,
+ alarm_body % params)
else:
- print "Warning slice " + slice['name']
- slicemail(slice['name'], alarm_subject % params,
- alarm_body % params)
- else:
- # Reset slice
- if not resetlist.has_key(slice['name']):
- resetlist[slice['name']] = Reset(slice['name'])
- resetlist[slice['name']].reset(params)
- slices = slicestat(names)
+ # Reset slice
+ if not debug:
+ if emailed.get(slice['name'], (time.time() + email_timeout + 1)) > (time.time() + email_timeout):
+ slicemail(slice['name'], kill_subject % params, kill_body % params)
+ emailed[slice['name']] = time.time()
+ else:
+ print kill_subject % params
+ print kill_body % params
+ print "Killing procs in %s" % slice['name']
+ killsliverprocs(slice['xid'])
+ # wait period before recalculating swap. If in danger, recalc.
if timer <= 0 or used >= (last_used + change_thresh):
if used >= (last_used + change_thresh):
print "%d%% swap consumed, %d%% in last %d seconds" % \
- (used, used - last_used, period - timer)
+ (used, used - last_used, period - timer)
# Get slice state
slices = slicestat(names)
# Reset timer
timer = period
# Keep track of large changes in swap utilization
last_used = used
-
timer -= 1
time.sleep(1)
git://git.onelab.eu / mom.git / blobdiff