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#!/usr/bin/env python
# -*- python-mode -*-
"""Emulate iostat for NFS mount points using /proc/self/mountstats
"""
__copyright__ = """
Copyright (C) 2005, Chuck Lever <cel@netapp.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
import sys, os, time
Iostats_version = '0.2'
def difference(x, y):
"""Used for a map() function
"""
return x - y
NfsEventCounters = [
'inoderevalidates',
'dentryrevalidates',
'datainvalidates',
'attrinvalidates',
'vfsopen',
'vfslookup',
'vfspermission',
'vfsupdatepage',
'vfsreadpage',
'vfsreadpages',
'vfswritepage',
'vfswritepages',
'vfsreaddir',
'vfssetattr',
'vfsflush',
'vfsfsync',
'vfslock',
'vfsrelease',
'congestionwait',
'setattrtrunc',
'extendwrite',
'sillyrenames',
'shortreads',
'shortwrites',
'delay'
]
NfsByteCounters = [
'normalreadbytes',
'normalwritebytes',
'directreadbytes',
'directwritebytes',
'serverreadbytes',
'serverwritebytes',
'readpages',
'writepages'
]
class DeviceData:
"""DeviceData objects provide methods for parsing and displaying
data for a single mount grabbed from /proc/self/mountstats
"""
def __init__(self):
self.__nfs_data = dict()
self.__rpc_data = dict()
self.__rpc_data['ops'] = []
def __parse_nfs_line(self, words):
if words[0] == 'device':
self.__nfs_data['export'] = words[1]
self.__nfs_data['mountpoint'] = words[4]
self.__nfs_data['fstype'] = words[7]
if words[7] == 'nfs':
self.__nfs_data['statvers'] = words[8]
elif words[0] == 'age:':
self.__nfs_data['age'] = long(words[1])
elif words[0] == 'opts:':
self.__nfs_data['mountoptions'] = ''.join(words[1:]).split(',')
elif words[0] == 'caps:':
self.__nfs_data['servercapabilities'] = ''.join(words[1:]).split(',')
elif words[0] == 'nfsv4:':
self.__nfs_data['nfsv4flags'] = ''.join(words[1:]).split(',')
elif words[0] == 'sec:':
keys = ''.join(words[1:]).split(',')
self.__nfs_data['flavor'] = int(keys[0].split('=')[1])
self.__nfs_data['pseudoflavor'] = 0
if self.__nfs_data['flavor'] == 6:
self.__nfs_data['pseudoflavor'] = int(keys[1].split('=')[1])
elif words[0] == 'events:':
i = 1
for key in NfsEventCounters:
self.__nfs_data[key] = int(words[i])
i += 1
elif words[0] == 'bytes:':
i = 1
for key in NfsByteCounters:
self.__nfs_data[key] = long(words[i])
i += 1
def __parse_rpc_line(self, words):
if words[0] == 'RPC':
self.__rpc_data['statsvers'] = float(words[3])
self.__rpc_data['programversion'] = words[5]
elif words[0] == 'xprt:':
self.__rpc_data['protocol'] = words[1]
if words[1] == 'udp':
self.__rpc_data['port'] = int(words[2])
self.__rpc_data['bind_count'] = int(words[3])
self.__rpc_data['rpcsends'] = int(words[4])
self.__rpc_data['rpcreceives'] = int(words[5])
self.__rpc_data['badxids'] = int(words[6])
self.__rpc_data['inflightsends'] = long(words[7])
self.__rpc_data['backlogutil'] = long(words[8])
elif words[1] == 'tcp':
self.__rpc_data['port'] = words[2]
self.__rpc_data['bind_count'] = int(words[3])
self.__rpc_data['connect_count'] = int(words[4])
self.__rpc_data['connect_time'] = int(words[5])
self.__rpc_data['idle_time'] = int(words[6])
self.__rpc_data['rpcsends'] = int(words[7])
self.__rpc_data['rpcreceives'] = int(words[8])
self.__rpc_data['badxids'] = int(words[9])
self.__rpc_data['inflightsends'] = long(words[10])
self.__rpc_data['backlogutil'] = long(words[11])
elif words[1] == 'rdma':
self.__rpc_data['port'] = words[2]
self.__rpc_data['bind_count'] = int(words[3])
self.__rpc_data['connect_count'] = int(words[4])
self.__rpc_data['connect_time'] = int(words[5])
self.__rpc_data['idle_time'] = int(words[6])
self.__rpc_data['rpcsends'] = int(words[7])
self.__rpc_data['rpcreceives'] = int(words[8])
self.__rpc_data['badxids'] = int(words[9])
self.__rpc_data['backlogutil'] = int(words[10])
self.__rpc_data['read_chunks'] = int(words[11])
self.__rpc_data['write_chunks'] = int(words[12])
self.__rpc_data['reply_chunks'] = int(words[13])
self.__rpc_data['total_rdma_req'] = int(words[14])
self.__rpc_data['total_rdma_rep'] = int(words[15])
self.__rpc_data['pullup'] = int(words[16])
self.__rpc_data['fixup'] = int(words[17])
self.__rpc_data['hardway'] = int(words[18])
self.__rpc_data['failed_marshal'] = int(words[19])
self.__rpc_data['bad_reply'] = int(words[20])
elif words[0] == 'per-op':
self.__rpc_data['per-op'] = words
else:
op = words[0][:-1]
self.__rpc_data['ops'] += [op]
self.__rpc_data[op] = [long(word) for word in words[1:]]
def parse_stats(self, lines):
"""Turn a list of lines from a mount stat file into a
dictionary full of stats, keyed by name
"""
found = False
for line in lines:
words = line.split()
if len(words) == 0:
continue
if (not found and words[0] != 'RPC'):
self.__parse_nfs_line(words)
continue
found = True
self.__parse_rpc_line(words)
def is_nfs_mountpoint(self):
"""Return True if this is an NFS or NFSv4 mountpoint,
otherwise return False
"""
if self.__nfs_data['fstype'] == 'nfs':
return True
elif self.__nfs_data['fstype'] == 'nfs4':
return True
return False
def compare_iostats(self, old_stats):
"""Return the difference between two sets of stats
"""
result = DeviceData()
# copy self into result
for key, value in self.__nfs_data.iteritems():
result.__nfs_data[key] = value
for key, value in self.__rpc_data.iteritems():
result.__rpc_data[key] = value
# compute the difference of each item in the list
# note the copy loop above does not copy the lists, just
# the reference to them. so we build new lists here
# for the result object.
for op in result.__rpc_data['ops']:
result.__rpc_data[op] = map(difference, self.__rpc_data[op], old_stats.__rpc_data[op])
# update the remaining keys we care about
result.__rpc_data['rpcsends'] -= old_stats.__rpc_data['rpcsends']
result.__rpc_data['backlogutil'] -= old_stats.__rpc_data['backlogutil']
for key in NfsEventCounters:
result.__nfs_data[key] -= old_stats.__nfs_data[key]
for key in NfsByteCounters:
result.__nfs_data[key] -= old_stats.__nfs_data[key]
return result
def __print_data_cache_stats(self):
"""Print the data cache hit rate
"""
nfs_stats = self.__nfs_data
app_bytes_read = float(nfs_stats['normalreadbytes'])
if app_bytes_read != 0:
client_bytes_read = float(nfs_stats['serverreadbytes'] - nfs_stats['directreadbytes'])
ratio = ((app_bytes_read - client_bytes_read) * 100) / app_bytes_read
print
print 'app bytes: %f client bytes %f' % (app_bytes_read, client_bytes_read)
print 'Data cache hit ratio: %4.2f%%' % ratio
def __print_attr_cache_stats(self, sample_time):
"""Print attribute cache efficiency stats
"""
nfs_stats = self.__nfs_data
getattr_stats = self.__rpc_data['GETATTR']
if nfs_stats['inoderevalidates'] != 0:
getattr_ops = float(getattr_stats[1])
opens = float(nfs_stats['vfsopen'])
revalidates = float(nfs_stats['inoderevalidates']) - opens
if revalidates != 0:
ratio = ((revalidates - getattr_ops) * 100) / revalidates
else:
ratio = 0.0
data_invalidates = float(nfs_stats['datainvalidates'])
attr_invalidates = float(nfs_stats['attrinvalidates'])
print
print '%d inode revalidations, hitting in cache %4.2f%% of the time' % \
(revalidates, ratio)
print '%d open operations (mandatory GETATTR requests)' % opens
if getattr_ops != 0:
print '%4.2f%% of GETATTRs resulted in data cache invalidations' % \
((data_invalidates * 100) / getattr_ops)
def __print_dir_cache_stats(self, sample_time):
"""Print directory stats
"""
nfs_stats = self.__nfs_data
lookup_ops = self.__rpc_data['LOOKUP'][0]
readdir_ops = self.__rpc_data['READDIR'][0]
if self.__rpc_data.has_key('READDIRPLUS'):
readdir_ops += self.__rpc_data['READDIRPLUS'][0]
dentry_revals = nfs_stats['dentryrevalidates']
opens = nfs_stats['vfsopen']
lookups = nfs_stats['vfslookup']
getdents = nfs_stats['vfsreaddir']
print
print '%d open operations (pathname lookups)' % opens
print '%d dentry revalidates and %d vfs lookup requests' % \
(dentry_revals, lookups),
print 'resulted in %d LOOKUPs on the wire' % lookup_ops
print '%d vfs getdents calls resulted in %d READDIRs on the wire' % \
(getdents, readdir_ops)
def __print_page_stats(self, sample_time):
"""Print page cache stats
"""
nfs_stats = self.__nfs_data
vfsreadpage = nfs_stats['vfsreadpage']
vfsreadpages = nfs_stats['vfsreadpages']
pages_read = nfs_stats['readpages']
vfswritepage = nfs_stats['vfswritepage']
vfswritepages = nfs_stats['vfswritepages']
pages_written = nfs_stats['writepages']
print
print '%d nfs_readpage() calls read %d pages' % \
(vfsreadpage, vfsreadpage)
print '%d nfs_readpages() calls read %d pages' % \
(vfsreadpages, pages_read - vfsreadpage),
if vfsreadpages != 0:
print '(%.1f pages per call)' % \
(float(pages_read - vfsreadpage) / vfsreadpages)
else:
print
print
print '%d nfs_updatepage() calls' % nfs_stats['vfsupdatepage']
print '%d nfs_writepage() calls wrote %d pages' % \
(vfswritepage, vfswritepage)
print '%d nfs_writepages() calls wrote %d pages' % \
(vfswritepages, pages_written - vfswritepage),
if (vfswritepages) != 0:
print '(%.1f pages per call)' % \
(float(pages_written - vfswritepage) / vfswritepages)
else:
print
congestionwaits = nfs_stats['congestionwait']
if congestionwaits != 0:
print
print '%d congestion waits' % congestionwaits
def __print_rpc_op_stats(self, op, sample_time):
"""Print generic stats for one RPC op
"""
if not self.__rpc_data.has_key(op):
return
rpc_stats = self.__rpc_data[op]
ops = float(rpc_stats[0])
retrans = float(rpc_stats[1] - rpc_stats[0])
kilobytes = float(rpc_stats[3] + rpc_stats[4]) / 1024
rtt = float(rpc_stats[6])
exe = float(rpc_stats[7])
# prevent floating point exceptions
if ops != 0:
kb_per_op = kilobytes / ops
retrans_percent = (retrans * 100) / ops
rtt_per_op = rtt / ops
exe_per_op = exe / ops
else:
kb_per_op = 0.0
retrans_percent = 0.0
rtt_per_op = 0.0
exe_per_op = 0.0
op += ':'
print '%s' % op.lower().ljust(15),
print ' ops/s\t\t Kb/s\t\t Kb/op\t\tretrans\t\tavg RTT (ms)\tavg exe (ms)'
print '\t\t%7.3f' % (ops / sample_time),
print '\t%7.3f' % (kilobytes / sample_time),
print '\t%7.3f' % kb_per_op,
print ' %7d (%3.1f%%)' % (retrans, retrans_percent),
print '\t%7.3f' % rtt_per_op,
print '\t%7.3f' % exe_per_op
def display_iostats(self, sample_time, which):
"""Display NFS and RPC stats in an iostat-like way
"""
sends = float(self.__rpc_data['rpcsends'])
if sample_time == 0:
sample_time = float(self.__nfs_data['age'])
if sends != 0:
backlog = (float(self.__rpc_data['backlogutil']) / sends) / sample_time
else:
backlog = 0.0
print
print '%s mounted on %s:' % \
(self.__nfs_data['export'], self.__nfs_data['mountpoint'])
print
print ' op/s\t\trpc bklog'
print '%7.2f' % (sends / sample_time),
print '\t%7.2f' % backlog
if which == 0:
self.__print_rpc_op_stats('READ', sample_time)
self.__print_rpc_op_stats('WRITE', sample_time)
elif which == 1:
self.__print_rpc_op_stats('GETATTR', sample_time)
self.__print_rpc_op_stats('ACCESS', sample_time)
self.__print_attr_cache_stats(sample_time)
elif which == 2:
self.__print_rpc_op_stats('LOOKUP', sample_time)
self.__print_rpc_op_stats('READDIR', sample_time)
if self.__rpc_data.has_key('READDIRPLUS'):
self.__print_rpc_op_stats('READDIRPLUS', sample_time)
self.__print_dir_cache_stats(sample_time)
elif which == 3:
self.__print_rpc_op_stats('READ', sample_time)
self.__print_rpc_op_stats('WRITE', sample_time)
self.__print_page_stats(sample_time)
#
# Functions
#
def print_iostat_help(name):
print 'usage: %s [ <interval> [ <count> ] ] [ <options> ] [ <mount point> ] ' % name
print
print ' Version %s' % Iostats_version
print
print ' Sample iostat-like program to display NFS client per-mount statistics.'
print
print ' The <interval> parameter specifies the amount of time in seconds between'
print ' each report. The first report contains statistics for the time since each'
print ' file system was mounted. Each subsequent report contains statistics'
print ' collected during the interval since the previous report.'
print
print ' If the <count> parameter is specified, the value of <count> determines the'
print ' number of reports generated at <interval> seconds apart. If the interval'
print ' parameter is specified without the <count> parameter, the command generates'
print ' reports continuously.'
print
print ' Options include "--attr", which displays statistics related to the attribute'
print ' cache, "--dir", which displays statistics related to directory operations,'
print ' and "--page", which displays statistics related to the page cache.'
print ' By default, if no option is specified, statistics related to file I/O are'
print ' displayed.'
print
print ' If one or more <mount point> names are specified, statistics for only these'
print ' mount points will be displayed. Otherwise, all NFS mount points on the'
print ' client are listed.'
def parse_stats_file(filename):
"""pop the contents of a mountstats file into a dictionary,
keyed by mount point. each value object is a list of the
lines in the mountstats file corresponding to the mount
point named in the key.
"""
ms_dict = dict()
key = ''
f = file(filename)
for line in f.readlines():
words = line.split()
if len(words) == 0:
continue
if words[0] == 'device':
key = words[4]
new = [ line.strip() ]
else:
new += [ line.strip() ]
ms_dict[key] = new
f.close
return ms_dict
def print_iostat_summary(old, new, devices, time, ac):
for device in devices:
stats = DeviceData()
stats.parse_stats(new[device])
if not old:
stats.display_iostats(time, ac)
else:
old_stats = DeviceData()
old_stats.parse_stats(old[device])
diff_stats = stats.compare_iostats(old_stats)
diff_stats.display_iostats(time, ac)
def iostat_command(name):
"""iostat-like command for NFS mount points
"""
mountstats = parse_stats_file('/proc/self/mountstats')
devices = []
which = 0
interval_seen = False
count_seen = False
for arg in sys.argv:
if arg in ['-h', '--help', 'help', 'usage']:
print_iostat_help(name)
return
if arg in ['-v', '--version', 'version']:
print '%s version %s' % (name, Iostats_version)
return
if arg in ['-a', '--attr']:
which = 1
continue
if arg in ['-d', '--dir']:
which = 2
continue
if arg in ['-p', '--page']:
which = 3
continue
if arg == sys.argv[0]:
continue
if arg in mountstats:
devices += [arg]
elif not interval_seen:
interval = int(arg)
if interval > 0:
interval_seen = True
else:
print 'Illegal <interval> value'
return
elif not count_seen:
count = int(arg)
if count > 0:
count_seen = True
else:
print 'Illegal <count> value'
return
# make certain devices contains only NFS mount points
if len(devices) > 0:
check = []
for device in devices:
stats = DeviceData()
stats.parse_stats(mountstats[device])
if stats.is_nfs_mountpoint():
check += [device]
devices = check
else:
for device, descr in mountstats.iteritems():
stats = DeviceData()
stats.parse_stats(descr)
if stats.is_nfs_mountpoint():
devices += [device]
if len(devices) == 0:
print 'No NFS mount points were found'
return
old_mountstats = None
sample_time = 0.0
if not interval_seen:
print_iostat_summary(old_mountstats, mountstats, devices, sample_time, which)
return
if count_seen:
while count != 0:
print_iostat_summary(old_mountstats, mountstats, devices, sample_time, which)
old_mountstats = mountstats
time.sleep(interval)
sample_time = interval
mountstats = parse_stats_file('/proc/self/mountstats')
count -= 1
else:
while True:
print_iostat_summary(old_mountstats, mountstats, devices, sample_time, which)
old_mountstats = mountstats
time.sleep(interval)
sample_time = interval
mountstats = parse_stats_file('/proc/self/mountstats')
#
# Main
#
prog = os.path.basename(sys.argv[0])
try:
iostat_command(prog)
except KeyboardInterrupt:
print 'Caught ^C... exiting'
sys.exit(1)
sys.exit(0)
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