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mirror_zfs/cmd/arcstat.in
Alexander Motin 792a6ee462
Update arc_summary and arcstat outputs 
Recent ARC commits added new statistic counters, such as iohits,
uncached state, etc.  Represent those.  Also some of previously
reported numbers were confusing or even made no sense.  Cleanup
and restructure existing reports.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:  Alexander Motin <mav@FreeBSD.org>
Sponsored by:   iXsystems, Inc.
Issue #14115 
Issue #14123
Issue #14243 
Closes #14320
2023-01-05 09:29:13 -08:00

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#!/usr/bin/env @PYTHON_SHEBANG@
#
# Print out ZFS ARC Statistics exported via kstat(1)
# For a definition of fields, or usage, use arcstat -v
#
# This script was originally a fork of the original arcstat.pl (0.1)
# by Neelakanth Nadgir, originally published on his Sun blog on
# 09/18/2007
# http://blogs.sun.com/realneel/entry/zfs_arc_statistics
#
# A new version aimed to improve upon the original by adding features
# and fixing bugs as needed. This version was maintained by Mike
# Harsch and was hosted in a public open source repository:
# http://github.com/mharsch/arcstat
#
# but has since moved to the illumos-gate repository.
#
# This Python port was written by John Hixson for FreeNAS, introduced
# in commit e2c29f:
# https://github.com/freenas/freenas
#
# and has been improved by many people since.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License, Version 1.0 only
# (the "License"). You may not use this file except in compliance
# with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or https://opensource.org/licenses/CDDL-1.0.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
#
# Fields have a fixed width. Every interval, we fill the "v"
# hash with its corresponding value (v[field]=value) using calculate().
# @hdr is the array of fields that needs to be printed, so we
# just iterate over this array and print the values using our pretty printer.
#
# This script must remain compatible with Python 3.6+.
#
import sys
import time
import getopt
import re
import copy
from signal import signal, SIGINT, SIGWINCH, SIG_DFL
cols = {
# HDR: [Size, Scale, Description]
"time": [8, -1, "Time"],
"hits": [4, 1000, "ARC hits per second"],
"iohs": [4, 1000, "ARC I/O hits per second"],
"miss": [4, 1000, "ARC misses per second"],
"read": [4, 1000, "Total ARC accesses per second"],
"hit%": [4, 100, "ARC hit percentage"],
"ioh%": [4, 100, "ARC I/O hit percentage"],
"miss%": [5, 100, "ARC miss percentage"],
"dhit": [4, 1000, "Demand hits per second"],
"dioh": [4, 1000, "Demand I/O hits per second"],
"dmis": [4, 1000, "Demand misses per second"],
"dh%": [3, 100, "Demand hit percentage"],
"di%": [3, 100, "Demand I/O hit percentage"],
"dm%": [3, 100, "Demand miss percentage"],
"ddhit": [5, 1000, "Demand data hits per second"],
"ddioh": [5, 1000, "Demand data I/O hits per second"],
"ddmis": [5, 1000, "Demand data misses per second"],
"ddh%": [4, 100, "Demand data hit percentage"],
"ddi%": [4, 100, "Demand data I/O hit percentage"],
"ddm%": [4, 100, "Demand data miss percentage"],
"dmhit": [5, 1000, "Demand metadata hits per second"],
"dmioh": [5, 1000, "Demand metadata I/O hits per second"],
"dmmis": [5, 1000, "Demand metadata misses per second"],
"dmh%": [4, 100, "Demand metadata hit percentage"],
"dmi%": [4, 100, "Demand metadata I/O hit percentage"],
"dmm%": [4, 100, "Demand metadata miss percentage"],
"phit": [4, 1000, "Prefetch hits per second"],
"pioh": [4, 1000, "Prefetch I/O hits per second"],
"pmis": [4, 1000, "Prefetch misses per second"],
"ph%": [3, 100, "Prefetch hits percentage"],
"pi%": [3, 100, "Prefetch I/O hits percentage"],
"pm%": [3, 100, "Prefetch miss percentage"],
"pdhit": [5, 1000, "Prefetch data hits per second"],
"pdioh": [5, 1000, "Prefetch data I/O hits per second"],
"pdmis": [5, 1000, "Prefetch data misses per second"],
"pdh%": [4, 100, "Prefetch data hits percentage"],
"pdi%": [4, 100, "Prefetch data I/O hits percentage"],
"pdm%": [4, 100, "Prefetch data miss percentage"],
"pmhit": [5, 1000, "Prefetch metadata hits per second"],
"pmioh": [5, 1000, "Prefetch metadata I/O hits per second"],
"pmmis": [5, 1000, "Prefetch metadata misses per second"],
"pmh%": [4, 100, "Prefetch metadata hits percentage"],
"pmi%": [4, 100, "Prefetch metadata I/O hits percentage"],
"pmm%": [4, 100, "Prefetch metadata miss percentage"],
"mhit": [4, 1000, "Metadata hits per second"],
"mioh": [4, 1000, "Metadata I/O hits per second"],
"mmis": [4, 1000, "Metadata misses per second"],
"mread": [5, 1000, "Metadata accesses per second"],
"mh%": [3, 100, "Metadata hit percentage"],
"mi%": [3, 100, "Metadata I/O hit percentage"],
"mm%": [3, 100, "Metadata miss percentage"],
"arcsz": [5, 1024, "ARC size"],
"size": [5, 1024, "ARC size"],
"c": [5, 1024, "ARC target size"],
"mfu": [4, 1000, "MFU list hits per second"],
"mru": [4, 1000, "MRU list hits per second"],
"mfug": [4, 1000, "MFU ghost list hits per second"],
"mrug": [4, 1000, "MRU ghost list hits per second"],
"unc": [4, 1000, "Uncached list hits per second"],
"eskip": [5, 1000, "evict_skip per second"],
"el2skip": [7, 1000, "evict skip, due to l2 writes, per second"],
"el2cach": [7, 1024, "Size of L2 cached evictions per second"],
"el2el": [5, 1024, "Size of L2 eligible evictions per second"],
"el2mfu": [6, 1024, "Size of L2 eligible MFU evictions per second"],
"el2mru": [6, 1024, "Size of L2 eligible MRU evictions per second"],
"el2inel": [7, 1024, "Size of L2 ineligible evictions per second"],
"mtxmis": [6, 1000, "mutex_miss per second"],
"dread": [5, 1000, "Demand accesses per second"],
"ddread": [6, 1000, "Demand data accesses per second"],
"dmread": [6, 1000, "Demand metadata accesses per second"],
"pread": [5, 1000, "Prefetch accesses per second"],
"pdread": [6, 1000, "Prefetch data accesses per second"],
"pmread": [6, 1000, "Prefetch metadata accesses per second"],
"l2hits": [6, 1000, "L2ARC hits per second"],
"l2miss": [6, 1000, "L2ARC misses per second"],
"l2read": [6, 1000, "Total L2ARC accesses per second"],
"l2hit%": [6, 100, "L2ARC access hit percentage"],
"l2miss%": [7, 100, "L2ARC access miss percentage"],
"l2pref": [6, 1024, "L2ARC prefetch allocated size"],
"l2mfu": [5, 1024, "L2ARC MFU allocated size"],
"l2mru": [5, 1024, "L2ARC MRU allocated size"],
"l2data": [6, 1024, "L2ARC data allocated size"],
"l2meta": [6, 1024, "L2ARC metadata allocated size"],
"l2pref%": [7, 100, "L2ARC prefetch percentage"],
"l2mfu%": [6, 100, "L2ARC MFU percentage"],
"l2mru%": [6, 100, "L2ARC MRU percentage"],
"l2data%": [7, 100, "L2ARC data percentage"],
"l2meta%": [7, 100, "L2ARC metadata percentage"],
"l2asize": [7, 1024, "Actual (compressed) size of the L2ARC"],
"l2size": [6, 1024, "Size of the L2ARC"],
"l2bytes": [7, 1024, "Bytes read per second from the L2ARC"],
"grow": [4, 1000, "ARC grow disabled"],
"need": [5, 1024, "ARC reclaim need"],
"free": [5, 1024, "ARC free memory"],
"avail": [5, 1024, "ARC available memory"],
"waste": [5, 1024, "Wasted memory due to round up to pagesize"],
}
v = {}
hdr = ["time", "read", "ddread", "ddh%", "dmread", "dmh%", "pread", "ph%",
"size", "c", "avail"]
xhdr = ["time", "mfu", "mru", "mfug", "mrug", "unc", "eskip", "mtxmis",
"dread", "pread", "read"]
sint = 1 # Default interval is 1 second
count = 1 # Default count is 1
hdr_intr = 20 # Print header every 20 lines of output
opfile = None
sep = " " # Default separator is 2 spaces
l2exist = False
cmd = ("Usage: arcstat [-havxp] [-f fields] [-o file] [-s string] [interval "
"[count]]\n")
cur = {}
d = {}
out = None
kstat = None
pretty_print = True
if sys.platform.startswith('freebsd'):
# Requires py-sysctl on FreeBSD
import sysctl
def kstat_update():
global kstat
k = [ctl for ctl in sysctl.filter('kstat.zfs.misc.arcstats')
if ctl.type != sysctl.CTLTYPE_NODE]
if not k:
sys.exit(1)
kstat = {}
for s in k:
if not s:
continue
name, value = s.name, s.value
# Trims 'kstat.zfs.misc.arcstats' from the name
kstat[name[24:]] = int(value)
elif sys.platform.startswith('linux'):
def kstat_update():
global kstat
k = [line.strip() for line in open('/proc/spl/kstat/zfs/arcstats')]
if not k:
sys.exit(1)
del k[0:2]
kstat = {}
for s in k:
if not s:
continue
name, unused, value = s.split()
kstat[name] = int(value)
def detailed_usage():
sys.stderr.write("%s\n" % cmd)
sys.stderr.write("Field definitions are as follows:\n")
for key in cols:
sys.stderr.write("%11s : %s\n" % (key, cols[key][2]))
sys.stderr.write("\n")
sys.exit(0)
def usage():
sys.stderr.write("%s\n" % cmd)
sys.stderr.write("\t -h : Print this help message\n")
sys.stderr.write("\t -a : Print all possible stats\n")
sys.stderr.write("\t -v : List all possible field headers and definitions"
"\n")
sys.stderr.write("\t -x : Print extended stats\n")
sys.stderr.write("\t -f : Specify specific fields to print (see -v)\n")
sys.stderr.write("\t -o : Redirect output to the specified file\n")
sys.stderr.write("\t -s : Override default field separator with custom "
"character or string\n")
sys.stderr.write("\t -p : Disable auto-scaling of numerical fields\n")
sys.stderr.write("\nExamples:\n")
sys.stderr.write("\tarcstat -o /tmp/a.log 2 10\n")
sys.stderr.write("\tarcstat -s \",\" -o /tmp/a.log 2 10\n")
sys.stderr.write("\tarcstat -v\n")
sys.stderr.write("\tarcstat -f time,hit%,dh%,ph%,mh% 1\n")
sys.stderr.write("\n")
sys.exit(1)
def snap_stats():
global cur
global kstat
prev = copy.deepcopy(cur)
kstat_update()
cur = kstat
for key in cur:
if re.match(key, "class"):
continue
if key in prev:
d[key] = cur[key] - prev[key]
else:
d[key] = cur[key]
def prettynum(sz, scale, num=0):
suffix = [' ', 'K', 'M', 'G', 'T', 'P', 'E', 'Z']
index = 0
save = 0
# Special case for date field
if scale == -1:
return "%s" % num
# Rounding error, return 0
elif 0 < num < 1:
num = 0
while abs(num) > scale and index < 5:
save = num
num = num / scale
index += 1
if index == 0:
return "%*d" % (sz, num)
if abs(save / scale) < 10:
return "%*.1f%s" % (sz - 1, num, suffix[index])
else:
return "%*d%s" % (sz - 1, num, suffix[index])
def print_values():
global hdr
global sep
global v
global pretty_print
if pretty_print:
fmt = lambda col: prettynum(cols[col][0], cols[col][1], v[col])
else:
fmt = lambda col: str(v[col])
sys.stdout.write(sep.join(fmt(col) for col in hdr))
sys.stdout.write("\n")
sys.stdout.flush()
def print_header():
global hdr
global sep
global pretty_print
if pretty_print:
fmt = lambda col: "%*s" % (cols[col][0], col)
else:
fmt = lambda col: col
sys.stdout.write(sep.join(fmt(col) for col in hdr))
sys.stdout.write("\n")
def get_terminal_lines():
try:
import fcntl
import termios
import struct
data = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, '1234')
sz = struct.unpack('hh', data)
return sz[0]
except Exception:
pass
def update_hdr_intr():
global hdr_intr
lines = get_terminal_lines()
if lines and lines > 3:
hdr_intr = lines - 3
def resize_handler(signum, frame):
update_hdr_intr()
def init():
global sint
global count
global hdr
global xhdr
global opfile
global sep
global out
global l2exist
global pretty_print
desired_cols = None
aflag = False
xflag = False
hflag = False
vflag = False
i = 1
try:
opts, args = getopt.getopt(
sys.argv[1:],
"axo:hvs:f:p",
[
"all",
"extended",
"outfile",
"help",
"verbose",
"separator",
"columns",
"parsable"
]
)
except getopt.error as msg:
sys.stderr.write("Error: %s\n" % str(msg))
usage()
opts = None
for opt, arg in opts:
if opt in ('-a', '--all'):
aflag = True
if opt in ('-x', '--extended'):
xflag = True
if opt in ('-o', '--outfile'):
opfile = arg
i += 1
if opt in ('-h', '--help'):
hflag = True
if opt in ('-v', '--verbose'):
vflag = True
if opt in ('-s', '--separator'):
sep = arg
i += 1
if opt in ('-f', '--columns'):
desired_cols = arg
i += 1
if opt in ('-p', '--parsable'):
pretty_print = False
i += 1
argv = sys.argv[i:]
sint = int(argv[0]) if argv else sint
count = int(argv[1]) if len(argv) > 1 else (0 if len(argv) > 0 else 1)
if hflag or (xflag and desired_cols):
usage()
if vflag:
detailed_usage()
if xflag:
hdr = xhdr
update_hdr_intr()
# check if L2ARC exists
snap_stats()
l2_size = cur.get("l2_size")
if l2_size:
l2exist = True
if desired_cols:
hdr = desired_cols.split(",")
invalid = []
incompat = []
for ele in hdr:
if ele not in cols:
invalid.append(ele)
elif not l2exist and ele.startswith("l2"):
sys.stdout.write("No L2ARC Here\n%s\n" % ele)
incompat.append(ele)
if len(invalid) > 0:
sys.stderr.write("Invalid column definition! -- %s\n" % invalid)
usage()
if len(incompat) > 0:
sys.stderr.write("Incompatible field specified! -- %s\n" %
incompat)
usage()
if aflag:
if l2exist:
hdr = cols.keys()
else:
hdr = [col for col in cols.keys() if not col.startswith("l2")]
if opfile:
try:
out = open(opfile, "w")
sys.stdout = out
except IOError:
sys.stderr.write("Cannot open %s for writing\n" % opfile)
sys.exit(1)
def calculate():
global d
global v
global l2exist
v = dict()
v["time"] = time.strftime("%H:%M:%S", time.localtime())
v["hits"] = d["hits"] // sint
v["iohs"] = d["iohits"] // sint
v["miss"] = d["misses"] // sint
v["read"] = v["hits"] + v["iohs"] + v["miss"]
v["hit%"] = 100 * v["hits"] // v["read"] if v["read"] > 0 else 0
v["ioh%"] = 100 * v["iohs"] // v["read"] if v["read"] > 0 else 0
v["miss%"] = 100 - v["hit%"] - v["ioh%"] if v["read"] > 0 else 0
v["dhit"] = (d["demand_data_hits"] + d["demand_metadata_hits"]) // sint
v["dioh"] = (d["demand_data_iohits"] + d["demand_metadata_iohits"]) // sint
v["dmis"] = (d["demand_data_misses"] + d["demand_metadata_misses"]) // sint
v["dread"] = v["dhit"] + v["dioh"] + v["dmis"]
v["dh%"] = 100 * v["dhit"] // v["dread"] if v["dread"] > 0 else 0
v["di%"] = 100 * v["dioh"] // v["dread"] if v["dread"] > 0 else 0
v["dm%"] = 100 - v["dh%"] - v["di%"] if v["dread"] > 0 else 0
v["ddhit"] = d["demand_data_hits"] // sint
v["ddioh"] = d["demand_data_iohits"] // sint
v["ddmis"] = d["demand_data_misses"] // sint
v["ddread"] = v["ddhit"] + v["ddioh"] + v["ddmis"]
v["ddh%"] = 100 * v["ddhit"] // v["ddread"] if v["ddread"] > 0 else 0
v["ddi%"] = 100 * v["ddioh"] // v["ddread"] if v["ddread"] > 0 else 0
v["ddm%"] = 100 - v["ddh%"] - v["ddi%"] if v["ddread"] > 0 else 0
v["dmhit"] = d["demand_metadata_hits"] // sint
v["dmioh"] = d["demand_metadata_iohits"] // sint
v["dmmis"] = d["demand_metadata_misses"] // sint
v["dmread"] = v["dmhit"] + v["dmioh"] + v["dmmis"]
v["dmh%"] = 100 * v["dmhit"] // v["dmread"] if v["dmread"] > 0 else 0
v["dmi%"] = 100 * v["dmioh"] // v["dmread"] if v["dmread"] > 0 else 0
v["dmm%"] = 100 - v["dmh%"] - v["dmi%"] if v["dmread"] > 0 else 0
v["phit"] = (d["prefetch_data_hits"] + d["prefetch_metadata_hits"]) // sint
v["pioh"] = (d["prefetch_data_iohits"] +
d["prefetch_metadata_iohits"]) // sint
v["pmis"] = (d["prefetch_data_misses"] +
d["prefetch_metadata_misses"]) // sint
v["pread"] = v["phit"] + v["pioh"] + v["pmis"]
v["ph%"] = 100 * v["phit"] // v["pread"] if v["pread"] > 0 else 0
v["pi%"] = 100 * v["pioh"] // v["pread"] if v["pread"] > 0 else 0
v["pm%"] = 100 - v["ph%"] - v["pi%"] if v["pread"] > 0 else 0
v["pdhit"] = d["prefetch_data_hits"] // sint
v["pdioh"] = d["prefetch_data_iohits"] // sint
v["pdmis"] = d["prefetch_data_misses"] // sint
v["pdread"] = v["pdhit"] + v["pdioh"] + v["pdmis"]
v["pdh%"] = 100 * v["pdhit"] // v["pdread"] if v["pdread"] > 0 else 0
v["pdi%"] = 100 * v["pdioh"] // v["pdread"] if v["pdread"] > 0 else 0
v["pdm%"] = 100 - v["pdh%"] - v["pdi%"] if v["pdread"] > 0 else 0
v["pmhit"] = d["prefetch_metadata_hits"] // sint
v["pmioh"] = d["prefetch_metadata_iohits"] // sint
v["pmmis"] = d["prefetch_metadata_misses"] // sint
v["pmread"] = v["pmhit"] + v["pmioh"] + v["pmmis"]
v["pmh%"] = 100 * v["pmhit"] // v["pmread"] if v["pmread"] > 0 else 0
v["pmi%"] = 100 * v["pmioh"] // v["pmread"] if v["pmread"] > 0 else 0
v["pmm%"] = 100 - v["pmh%"] - v["pmi%"] if v["pmread"] > 0 else 0
v["mhit"] = (d["prefetch_metadata_hits"] +
d["demand_metadata_hits"]) // sint
v["mioh"] = (d["prefetch_metadata_iohits"] +
d["demand_metadata_iohits"]) // sint
v["mmis"] = (d["prefetch_metadata_misses"] +
d["demand_metadata_misses"]) // sint
v["mread"] = v["mhit"] + v["mioh"] + v["mmis"]
v["mh%"] = 100 * v["mhit"] // v["mread"] if v["mread"] > 0 else 0
v["mi%"] = 100 * v["mioh"] // v["mread"] if v["mread"] > 0 else 0
v["mm%"] = 100 - v["mh%"] - v["mi%"] if v["mread"] > 0 else 0
v["arcsz"] = cur["size"]
v["size"] = cur["size"]
v["c"] = cur["c"]
v["mfu"] = d["mfu_hits"] // sint
v["mru"] = d["mru_hits"] // sint
v["mrug"] = d["mru_ghost_hits"] // sint
v["mfug"] = d["mfu_ghost_hits"] // sint
v["unc"] = d["uncached_hits"] // sint
v["eskip"] = d["evict_skip"] // sint
v["el2skip"] = d["evict_l2_skip"] // sint
v["el2cach"] = d["evict_l2_cached"] // sint
v["el2el"] = d["evict_l2_eligible"] // sint
v["el2mfu"] = d["evict_l2_eligible_mfu"] // sint
v["el2mru"] = d["evict_l2_eligible_mru"] // sint
v["el2inel"] = d["evict_l2_ineligible"] // sint
v["mtxmis"] = d["mutex_miss"] // sint
if l2exist:
v["l2hits"] = d["l2_hits"] // sint
v["l2miss"] = d["l2_misses"] // sint
v["l2read"] = v["l2hits"] + v["l2miss"]
v["l2hit%"] = 100 * v["l2hits"] // v["l2read"] if v["l2read"] > 0 else 0
v["l2miss%"] = 100 - v["l2hit%"] if v["l2read"] > 0 else 0
v["l2asize"] = cur["l2_asize"]
v["l2size"] = cur["l2_size"]
v["l2bytes"] = d["l2_read_bytes"] // sint
v["l2pref"] = cur["l2_prefetch_asize"]
v["l2mfu"] = cur["l2_mfu_asize"]
v["l2mru"] = cur["l2_mru_asize"]
v["l2data"] = cur["l2_bufc_data_asize"]
v["l2meta"] = cur["l2_bufc_metadata_asize"]
v["l2pref%"] = 100 * v["l2pref"] // v["l2asize"]
v["l2mfu%"] = 100 * v["l2mfu"] // v["l2asize"]
v["l2mru%"] = 100 * v["l2mru"] // v["l2asize"]
v["l2data%"] = 100 * v["l2data"] // v["l2asize"]
v["l2meta%"] = 100 * v["l2meta"] // v["l2asize"]
v["grow"] = 0 if cur["arc_no_grow"] else 1
v["need"] = cur["arc_need_free"]
v["free"] = cur["memory_free_bytes"]
v["avail"] = cur["memory_available_bytes"]
v["waste"] = cur["abd_chunk_waste_size"]
def main():
global sint
global count
global hdr_intr
i = 0
count_flag = 0
init()
if count > 0:
count_flag = 1
signal(SIGINT, SIG_DFL)
signal(SIGWINCH, resize_handler)
while True:
if i == 0:
print_header()
snap_stats()
calculate()
print_values()
if count_flag == 1:
if count <= 1:
break
count -= 1
i = 0 if i >= hdr_intr else i + 1
time.sleep(sint)
if out:
out.close()
if __name__ == '__main__':
main()
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