463 lines
13 KiB
Python
Executable File
463 lines
13 KiB
Python
Executable File
#!/usr/bin/python
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#
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# Print out ZFS ARC Statistics exported via kstat(1)
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# For a definition of fields, or usage, use arctstat.pl -v
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#
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# This script is a fork of the original arcstat.pl (0.1) by
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# Neelakanth Nadgir, originally published on his Sun blog on
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# 09/18/2007
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# http://blogs.sun.com/realneel/entry/zfs_arc_statistics
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#
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# This version aims to improve upon the original by adding features
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# and fixing bugs as needed. This version is maintained by
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# Mike Harsch and is hosted in a public open source repository:
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# http://github.com/mharsch/arcstat
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#
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# Comments, Questions, or Suggestions are always welcome.
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# Contact the maintainer at ( mike at harschsystems dot com )
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#
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# CDDL HEADER START
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#
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# The contents of this file are subject to the terms of the
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# Common Development and Distribution License, Version 1.0 only
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# (the "License"). You may not use this file except in compliance
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# with the License.
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#
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# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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# or http://www.opensolaris.org/os/licensing.
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# See the License for the specific language governing permissions
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# and limitations under the License.
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#
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# When distributing Covered Code, include this CDDL HEADER in each
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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# If applicable, add the following below this CDDL HEADER, with the
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# fields enclosed by brackets "[]" replaced with your own identifying
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# information: Portions Copyright [yyyy] [name of copyright owner]
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#
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# CDDL HEADER END
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#
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#
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# Fields have a fixed width. Every interval, we fill the "v"
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# hash with its corresponding value (v[field]=value) using calculate().
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# @hdr is the array of fields that needs to be printed, so we
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# just iterate over this array and print the values using our pretty printer.
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#
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import sys
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import time
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import getopt
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import re
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import copy
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from decimal import Decimal
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from signal import signal, SIGINT, SIGWINCH, SIG_DFL
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cols = {
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# HDR: [Size, Scale, Description]
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"time": [8, -1, "Time"],
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"hits": [4, 1000, "ARC reads per second"],
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"miss": [4, 1000, "ARC misses per second"],
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"read": [4, 1000, "Total ARC accesses per second"],
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"hit%": [4, 100, "ARC Hit percentage"],
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"miss%": [5, 100, "ARC miss percentage"],
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"dhit": [4, 1000, "Demand hits per second"],
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"dmis": [4, 1000, "Demand misses per second"],
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"dh%": [3, 100, "Demand hit percentage"],
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"dm%": [3, 100, "Demand miss percentage"],
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"phit": [4, 1000, "Prefetch hits per second"],
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"pmis": [4, 1000, "Prefetch misses per second"],
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"ph%": [3, 100, "Prefetch hits percentage"],
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"pm%": [3, 100, "Prefetch miss percentage"],
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"mhit": [4, 1000, "Metadata hits per second"],
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"mmis": [4, 1000, "Metadata misses per second"],
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"mread": [4, 1000, "Metadata accesses per second"],
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"mh%": [3, 100, "Metadata hit percentage"],
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"mm%": [3, 100, "Metadata miss percentage"],
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"arcsz": [5, 1024, "ARC Size"],
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"c": [4, 1024, "ARC Target Size"],
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"mfu": [4, 1000, "MFU List hits per second"],
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"mru": [4, 1000, "MRU List hits per second"],
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"mfug": [4, 1000, "MFU Ghost List hits per second"],
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"mrug": [4, 1000, "MRU Ghost List hits per second"],
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"eskip": [5, 1000, "evict_skip per second"],
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"mtxmis": [6, 1000, "mutex_miss per second"],
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"dread": [5, 1000, "Demand accesses per second"],
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"pread": [5, 1000, "Prefetch accesses per second"],
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"l2hits": [6, 1000, "L2ARC hits per second"],
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"l2miss": [6, 1000, "L2ARC misses per second"],
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"l2read": [6, 1000, "Total L2ARC accesses per second"],
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"l2hit%": [6, 100, "L2ARC access hit percentage"],
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"l2miss%": [7, 100, "L2ARC access miss percentage"],
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"l2asize": [7, 1024, "Actual (compressed) size of the L2ARC"],
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"l2size": [6, 1024, "Size of the L2ARC"],
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"l2bytes": [7, 1024, "bytes read per second from the L2ARC"],
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}
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v = {}
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hdr = ["time", "read", "miss", "miss%", "dmis", "dm%", "pmis", "pm%", "mmis",
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"mm%", "arcsz", "c"]
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xhdr = ["time", "mfu", "mru", "mfug", "mrug", "eskip", "mtxmis", "dread",
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"pread", "read"]
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sint = 1 # Default interval is 1 second
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count = 1 # Default count is 1
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hdr_intr = 20 # Print header every 20 lines of output
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opfile = None
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sep = " " # Default separator is 2 spaces
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version = "0.4"
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l2exist = False
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cmd = ("Usage: arcstat.py [-hvx] [-f fields] [-o file] [-s string] [interval "
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"[count]]\n")
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cur = {}
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d = {}
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out = None
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kstat = None
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float_pobj = re.compile("^[0-9]+(\.[0-9]+)?$")
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def detailed_usage():
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sys.stderr.write("%s\n" % cmd)
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sys.stderr.write("Field definitions are as follows:\n")
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for key in cols:
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sys.stderr.write("%11s : %s\n" % (key, cols[key][2]))
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sys.stderr.write("\n")
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sys.exit(1)
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def usage():
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sys.stderr.write("%s\n" % cmd)
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sys.stderr.write("\t -h : Print this help message\n")
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sys.stderr.write("\t -v : List all possible field headers and definitions"
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"\n")
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sys.stderr.write("\t -x : Print extended stats\n")
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sys.stderr.write("\t -f : Specify specific fields to print (see -v)\n")
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sys.stderr.write("\t -o : Redirect output to the specified file\n")
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sys.stderr.write("\t -s : Override default field separator with custom "
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"character or string\n")
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sys.stderr.write("\nExamples:\n")
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sys.stderr.write("\tarcstat.py -o /tmp/a.log 2 10\n")
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sys.stderr.write("\tarcstat.py -s \",\" -o /tmp/a.log 2 10\n")
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sys.stderr.write("\tarcstat.py -v\n")
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sys.stderr.write("\tarcstat.py -f time,hit%,dh%,ph%,mh% 1\n")
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sys.stderr.write("\n")
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sys.exit(1)
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def kstat_update():
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global kstat
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k = [line.strip() for line in open('/proc/spl/kstat/zfs/arcstats')]
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if not k:
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sys.exit(1)
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del k[0:2]
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kstat = {}
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for s in k:
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if not s:
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continue
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name, unused, value = s.split()
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kstat[name] = Decimal(value)
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def snap_stats():
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global cur
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global kstat
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prev = copy.deepcopy(cur)
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kstat_update()
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cur = kstat
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for key in cur:
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if re.match(key, "class"):
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continue
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if key in prev:
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d[key] = cur[key] - prev[key]
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else:
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d[key] = cur[key]
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def prettynum(sz, scale, num=0):
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suffix = [' ', 'K', 'M', 'G', 'T', 'P', 'E', 'Z']
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index = 0
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save = 0
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# Special case for date field
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if scale == -1:
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return "%s" % num
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# Rounding error, return 0
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elif 0 < num < 1:
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num = 0
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while num > scale and index < 5:
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save = num
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num = num / scale
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index += 1
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if index == 0:
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return "%*d" % (sz, num)
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if (save / scale) < 10:
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return "%*.1f%s" % (sz - 1, num, suffix[index])
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else:
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return "%*d%s" % (sz - 1, num, suffix[index])
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def print_values():
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global hdr
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global sep
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global v
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for col in hdr:
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sys.stdout.write("%s%s" % (
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prettynum(cols[col][0], cols[col][1], v[col]),
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sep
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))
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sys.stdout.write("\n")
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def print_header():
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global hdr
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global sep
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for col in hdr:
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sys.stdout.write("%*s%s" % (cols[col][0], col, sep))
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sys.stdout.write("\n")
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def get_terminal_lines():
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try:
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import fcntl
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import termios
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import struct
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data = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, '1234')
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sz = struct.unpack('hh', data)
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return sz[0]
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except:
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pass
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def update_hdr_intr():
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global hdr_intr
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lines = get_terminal_lines()
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if lines and lines > 3:
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hdr_intr = lines - 3
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def resize_handler(signum, frame):
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update_hdr_intr()
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def init():
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global sint
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global count
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global hdr
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global xhdr
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global opfile
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global sep
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global out
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global l2exist
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desired_cols = None
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xflag = False
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hflag = False
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vflag = False
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i = 1
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try:
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opts, args = getopt.getopt(
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sys.argv[1:],
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"xo:hvs:f:",
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[
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"extended",
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"outfile",
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"help",
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"verbose",
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"seperator",
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"columns"
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]
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)
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except getopt.error as msg:
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sys.stderr.write(msg)
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usage()
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opts = None
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for opt, arg in opts:
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if opt in ('-x', '--extended'):
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xflag = True
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if opt in ('-o', '--outfile'):
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opfile = arg
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i += 1
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if opt in ('-h', '--help'):
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hflag = True
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if opt in ('-v', '--verbose'):
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vflag = True
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if opt in ('-s', '--seperator'):
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sep = arg
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i += 1
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if opt in ('-f', '--columns'):
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desired_cols = arg
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i += 1
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i += 1
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argv = sys.argv[i:]
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sint = Decimal(argv[0]) if argv else sint
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count = int(argv[1]) if len(argv) > 1 else count
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if len(argv) > 1:
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sint = Decimal(argv[0])
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count = int(argv[1])
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elif len(argv) > 0:
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sint = Decimal(argv[0])
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count = 0
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if hflag or (xflag and desired_cols):
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usage()
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if vflag:
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detailed_usage()
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if xflag:
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hdr = xhdr
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update_hdr_intr()
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# check if L2ARC exists
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snap_stats()
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l2_size = cur.get("l2_size")
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if l2_size:
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l2exist = True
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if desired_cols:
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hdr = desired_cols.split(",")
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invalid = []
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incompat = []
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for ele in hdr:
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if ele not in cols:
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invalid.append(ele)
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elif not l2exist and ele.startswith("l2"):
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sys.stdout.write("No L2ARC Here\n%s\n" % ele)
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incompat.append(ele)
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if len(invalid) > 0:
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sys.stderr.write("Invalid column definition! -- %s\n" % invalid)
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usage()
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if len(incompat) > 0:
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sys.stderr.write("Incompatible field specified! -- %s\n" %
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incompat)
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usage()
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if opfile:
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try:
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out = open(opfile, "w")
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sys.stdout = out
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except IOError:
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sys.stderr.write("Cannot open %s for writing\n" % opfile)
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sys.exit(1)
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def calculate():
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global d
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global v
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global l2exist
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v = dict()
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v["time"] = time.strftime("%H:%M:%S", time.localtime())
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v["hits"] = d["hits"] / sint
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v["miss"] = d["misses"] / sint
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v["read"] = v["hits"] + v["miss"]
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v["hit%"] = 100 * v["hits"] / v["read"] if v["read"] > 0 else 0
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v["miss%"] = 100 - v["hit%"] if v["read"] > 0 else 0
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v["dhit"] = (d["demand_data_hits"] + d["demand_metadata_hits"]) / sint
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v["dmis"] = (d["demand_data_misses"] + d["demand_metadata_misses"]) / sint
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v["dread"] = v["dhit"] + v["dmis"]
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v["dh%"] = 100 * v["dhit"] / v["dread"] if v["dread"] > 0 else 0
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v["dm%"] = 100 - v["dh%"] if v["dread"] > 0 else 0
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v["phit"] = (d["prefetch_data_hits"] + d["prefetch_metadata_hits"]) / sint
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v["pmis"] = (d["prefetch_data_misses"] +
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d["prefetch_metadata_misses"]) / sint
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v["pread"] = v["phit"] + v["pmis"]
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v["ph%"] = 100 * v["phit"] / v["pread"] if v["pread"] > 0 else 0
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v["pm%"] = 100 - v["ph%"] if v["pread"] > 0 else 0
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v["mhit"] = (d["prefetch_metadata_hits"] +
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d["demand_metadata_hits"]) / sint
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v["mmis"] = (d["prefetch_metadata_misses"] +
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d["demand_metadata_misses"]) / sint
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v["mread"] = v["mhit"] + v["mmis"]
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v["mh%"] = 100 * v["mhit"] / v["mread"] if v["mread"] > 0 else 0
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v["mm%"] = 100 - v["mh%"] if v["mread"] > 0 else 0
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v["arcsz"] = cur["size"]
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v["c"] = cur["c"]
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v["mfu"] = d["mfu_hits"] / sint
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v["mru"] = d["mru_hits"] / sint
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v["mrug"] = d["mru_ghost_hits"] / sint
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v["mfug"] = d["mfu_ghost_hits"] / sint
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v["eskip"] = d["evict_skip"] / sint
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v["mtxmis"] = d["mutex_miss"] / sint
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if l2exist:
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v["l2hits"] = d["l2_hits"] / sint
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v["l2miss"] = d["l2_misses"] / sint
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v["l2read"] = v["l2hits"] + v["l2miss"]
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v["l2hit%"] = 100 * v["l2hits"] / v["l2read"] if v["l2read"] > 0 else 0
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v["l2miss%"] = 100 - v["l2hit%"] if v["l2read"] > 0 else 0
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v["l2asize"] = cur["l2_asize"]
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v["l2size"] = cur["l2_size"]
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v["l2bytes"] = d["l2_read_bytes"] / sint
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def main():
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global sint
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global count
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global hdr_intr
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i = 0
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count_flag = 0
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init()
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if count > 0:
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count_flag = 1
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signal(SIGINT, SIG_DFL)
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signal(SIGWINCH, resize_handler)
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while True:
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if i == 0:
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print_header()
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snap_stats()
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calculate()
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print_values()
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if count_flag == 1:
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if count <= 1:
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break
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count -= 1
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i = 0 if i >= hdr_intr else i + 1
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time.sleep(sint)
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if out:
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out.close()
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if __name__ == '__main__':
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main()
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