granicus.if.org Git - zfs/blob - cmd/arc_summary/arc_summary.py

   1 #!/usr/bin/python
   2 #
   3 # $Id: arc_summary.pl,v 388:e27800740aa2 2011-07-08 02:53:29Z jhell $
   4 #
   5 # Copyright (c) 2008 Ben Rockwood <benr@cuddletech.com>,
   6 # Copyright (c) 2010 Martin Matuska <mm@FreeBSD.org>,
   7 # Copyright (c) 2010-2011 Jason J. Hellenthal <jhell@DataIX.net>,
   8 # All rights reserved.
   9 #
  10 # Redistribution and use in source and binary forms, with or without
  11 # modification, are permitted provided that the following conditions
  12 # are met:
  13 #
  14 # 1. Redistributions of source code must retain the above copyright
  15 #    notice, this list of conditions and the following disclaimer.
  16 # 2. Redistributions in binary form must reproduce the above copyright
  17 #    notice, this list of conditions and the following disclaimer in the
  18 #    documentation and/or other materials provided with the distribution.
  19 #
  20 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23 # ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
  24 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30 # SUCH DAMAGE.
  31 #
  32 # If you are having troubles when using this script from cron(8) please try
  33 # adjusting your PATH before reporting problems.
  34 #
  35 # /usr/bin & /sbin
  36 #
  37 # Binaries used are:
  38 #
  39 # dc(1), kldstat(8), sed(1), sysctl(8) & vmstat(8)
  40 #
  41 # Binaries that I am working on phasing out are:
  42 #
  43 # dc(1) & sed(1)
  44
  45 import sys
  46 import time
  47 import getopt
  48 import re
  49 from os import listdir
  50 from subprocess import Popen, PIPE
  51 from decimal import Decimal as D
  52
  53
  54 usetunable = True
  55 show_tunable_descriptions = False
  56 alternate_tunable_layout = False
  57 kstat_pobj = re.compile("^([^:]+):\s+(.+)\s*$", flags=re.M)
  58
  59
  60 def get_Kstat():
  61     def load_proc_kstats(fn, namespace):
  62         kstats = [line.strip() for line in open(fn)]
  63         del kstats[0:2]
  64         for kstat in kstats:
  65             kstat = kstat.strip()
  66             name, unused, value = kstat.split()
  67             Kstat[namespace + name] = D(value)
  68
  69     Kstat = {}
  70     load_proc_kstats('/proc/spl/kstat/zfs/arcstats',
  71                      'kstat.zfs.misc.arcstats.')
  72     load_proc_kstats('/proc/spl/kstat/zfs/zfetchstats',
  73                      'kstat.zfs.misc.zfetchstats.')
  74     load_proc_kstats('/proc/spl/kstat/zfs/vdev_cache_stats',
  75                      'kstat.zfs.misc.vdev_cache_stats.')
  76
  77     return Kstat
  78
  79
  80 def div1():
  81     sys.stdout.write("\n")
  82     for i in range(18):
  83         sys.stdout.write("%s" % "----")
  84     sys.stdout.write("\n")
  85
  86
  87 def div2():
  88     sys.stdout.write("\n")
  89
  90
  91 def fBytes(Bytes=0, Decimal=2):
  92     kbytes = (2 ** 10)
  93     mbytes = (2 ** 20)
  94     gbytes = (2 ** 30)
  95     tbytes = (2 ** 40)
  96     pbytes = (2 ** 50)
  97     ebytes = (2 ** 60)
  98     zbytes = (2 ** 70)
  99     ybytes = (2 ** 80)
 100
 101     if Bytes >= ybytes:
 102         return str("%0." + str(Decimal) + "f") % (Bytes / ybytes) + "\tYiB"
 103     elif Bytes >= zbytes:
 104         return str("%0." + str(Decimal) + "f") % (Bytes / zbytes) + "\tZiB"
 105     elif Bytes >= ebytes:
 106         return str("%0." + str(Decimal) + "f") % (Bytes / ebytes) + "\tEiB"
 107     elif Bytes >= pbytes:
 108         return str("%0." + str(Decimal) + "f") % (Bytes / pbytes) + "\tPiB"
 109     elif Bytes >= tbytes:
 110         return str("%0." + str(Decimal) + "f") % (Bytes / tbytes) + "\tTiB"
 111     elif Bytes >= gbytes:
 112         return str("%0." + str(Decimal) + "f") % (Bytes / gbytes) + "\tGiB"
 113     elif Bytes >= mbytes:
 114         return str("%0." + str(Decimal) + "f") % (Bytes / mbytes) + "\tMiB"
 115     elif Bytes >= kbytes:
 116         return str("%0." + str(Decimal) + "f") % (Bytes / kbytes) + "\tKiB"
 117     elif Bytes == 0:
 118         return str("%d" % 0) + "\tBytes"
 119     else:
 120         return str("%d" % Bytes) + "\tBytes"
 121
 122
 123 def fHits(Hits=0, Decimal=2):
 124     khits = (10 ** 3)
 125     mhits = (10 ** 6)
 126     bhits = (10 ** 9)
 127     thits = (10 ** 12)
 128     qhits = (10 ** 15)
 129     Qhits = (10 ** 18)
 130     shits = (10 ** 21)
 131     Shits = (10 ** 24)
 132
 133     if Hits >= Shits:
 134         return str("%0." + str(Decimal) + "f") % (Hits / Shits) + "S"
 135     elif Hits >= shits:
 136         return str("%0." + str(Decimal) + "f") % (Hits / shits) + "s"
 137     elif Hits >= Qhits:
 138         return str("%0." + str(Decimal) + "f") % (Hits / Qhits) + "Q"
 139     elif Hits >= qhits:
 140         return str("%0." + str(Decimal) + "f") % (Hits / qhits) + "q"
 141     elif Hits >= thits:
 142         return str("%0." + str(Decimal) + "f") % (Hits / thits) + "t"
 143     elif Hits >= bhits:
 144         return str("%0." + str(Decimal) + "f") % (Hits / bhits) + "b"
 145     elif Hits >= mhits:
 146         return str("%0." + str(Decimal) + "f") % (Hits / mhits) + "m"
 147     elif Hits >= khits:
 148         return str("%0." + str(Decimal) + "f") % (Hits / khits) + "k"
 149     elif Hits == 0:
 150         return str("%d" % 0)
 151     else:
 152         return str("%d" % Hits)
 153
 154
 155 def fPerc(lVal=0, rVal=0, Decimal=2):
 156     if rVal > 0:
 157         return str("%0." + str(Decimal) + "f") % (100 * (lVal / rVal)) + "%"
 158     else:
 159         return str("%0." + str(Decimal) + "f") % 100 + "%"
 160
 161
 162 def get_arc_summary(Kstat):
 163
 164     output = {}
 165     memory_throttle_count = Kstat[
 166         "kstat.zfs.misc.arcstats.memory_throttle_count"
 167         ]
 168
 169     if memory_throttle_count > 0:
 170         output['health'] = 'THROTTLED'
 171     else:
 172         output['health'] = 'HEALTHY'
 173
 174     output['memory_throttle_count'] = fHits(memory_throttle_count)
 175
 176     # ARC Misc.
 177     deleted = Kstat["kstat.zfs.misc.arcstats.deleted"]
 178     mutex_miss = Kstat["kstat.zfs.misc.arcstats.mutex_miss"]
 179
 180     # ARC Misc.
 181     output["arc_misc"] = {}
 182     output["arc_misc"]["deleted"] = fHits(deleted)
 183     output["arc_misc"]['mutex_miss'] = fHits(mutex_miss)
 184     output["arc_misc"]['evict_skips'] = fHits(mutex_miss)
 185
 186     # ARC Sizing
 187     arc_size = Kstat["kstat.zfs.misc.arcstats.size"]
 188     mru_size = Kstat["kstat.zfs.misc.arcstats.p"]
 189     target_max_size = Kstat["kstat.zfs.misc.arcstats.c_max"]
 190     target_min_size = Kstat["kstat.zfs.misc.arcstats.c_min"]
 191     target_size = Kstat["kstat.zfs.misc.arcstats.c"]
 192
 193     target_size_ratio = (target_max_size / target_min_size)
 194
 195     # ARC Sizing
 196     output['arc_sizing'] = {}
 197     output['arc_sizing']['arc_size'] = {
 198         'per': fPerc(arc_size, target_max_size),
 199         'num': fBytes(arc_size),
 200     }
 201     output['arc_sizing']['target_max_size'] = {
 202         'ratio': target_size_ratio,
 203         'num': fBytes(target_max_size),
 204     }
 205     output['arc_sizing']['target_min_size'] = {
 206         'per': fPerc(target_min_size, target_max_size),
 207         'num': fBytes(target_min_size),
 208     }
 209     output['arc_sizing']['target_size'] = {
 210         'per': fPerc(target_size, target_max_size),
 211         'num': fBytes(target_size),
 212     }
 213
 214     # ARC Hash Breakdown
 215     output['arc_hash_break'] = {}
 216     output['arc_hash_break']['hash_chain_max'] = Kstat[
 217         "kstat.zfs.misc.arcstats.hash_chain_max"
 218         ]
 219     output['arc_hash_break']['hash_chains'] = Kstat[
 220         "kstat.zfs.misc.arcstats.hash_chains"
 221         ]
 222     output['arc_hash_break']['hash_collisions'] = Kstat[
 223         "kstat.zfs.misc.arcstats.hash_collisions"
 224         ]
 225     output['arc_hash_break']['hash_elements'] = Kstat[
 226         "kstat.zfs.misc.arcstats.hash_elements"
 227         ]
 228     output['arc_hash_break']['hash_elements_max'] = Kstat[
 229         "kstat.zfs.misc.arcstats.hash_elements_max"
 230         ]
 231
 232     output['arc_size_break'] = {}
 233     if arc_size > target_size:
 234         mfu_size = (arc_size - mru_size)
 235         output['arc_size_break']['recently_used_cache_size'] = {
 236             'per': fPerc(mru_size, arc_size),
 237             'num': fBytes(mru_size),
 238         }
 239         output['arc_size_break']['frequently_used_cache_size'] = {
 240             'per': fPerc(mfu_size, arc_size),
 241             'num': fBytes(mfu_size),
 242         }
 243
 244     elif arc_size < target_size:
 245         mfu_size = (target_size - mru_size)
 246         output['arc_size_break']['recently_used_cache_size'] = {
 247             'per': fPerc(mru_size, target_size),
 248             'num': fBytes(mru_size),
 249         }
 250         output['arc_size_break']['frequently_used_cache_size'] = {
 251             'per': fPerc(mfu_size, target_size),
 252             'num': fBytes(mfu_size),
 253         }
 254
 255     # ARC Hash Breakdown
 256     hash_chain_max = Kstat["kstat.zfs.misc.arcstats.hash_chain_max"]
 257     hash_chains = Kstat["kstat.zfs.misc.arcstats.hash_chains"]
 258     hash_collisions = Kstat["kstat.zfs.misc.arcstats.hash_collisions"]
 259     hash_elements = Kstat["kstat.zfs.misc.arcstats.hash_elements"]
 260     hash_elements_max = Kstat["kstat.zfs.misc.arcstats.hash_elements_max"]
 261
 262     output['arc_hash_break'] = {}
 263     output['arc_hash_break']['elements_max'] = fHits(hash_elements_max)
 264     output['arc_hash_break']['elements_current'] = {
 265         'per': fPerc(hash_elements, hash_elements_max),
 266         'num': fHits(hash_elements),
 267         }
 268     output['arc_hash_break']['collisions'] = fHits(hash_collisions)
 269     output['arc_hash_break']['chain_max'] = fHits(hash_chain_max)
 270     output['arc_hash_break']['chains'] = fHits(hash_chains)
 271
 272     return output
 273
 274
 275 def _arc_summary(Kstat):
 276     # ARC Sizing
 277     arc = get_arc_summary(Kstat)
 278
 279     sys.stdout.write("ARC Summary: (%s)\n" % arc['health'])
 280
 281     sys.stdout.write("\tMemory Throttle Count:\t\t\t%s\n" %
 282                      arc['memory_throttle_count'])
 283     sys.stdout.write("\n")
 284
 285     # ARC Misc.
 286     sys.stdout.write("ARC Misc:\n")
 287     sys.stdout.write("\tDeleted:\t\t\t\t%s\n" % arc['arc_misc']['deleted'])
 288     sys.stdout.write("\tMutex Misses:\t\t\t\t%s\n" %
 289                      arc['arc_misc']['mutex_miss'])
 290     sys.stdout.write("\tEvict Skips:\t\t\t\t%s\n" %
 291                      arc['arc_misc']['mutex_miss'])
 292     sys.stdout.write("\n")
 293
 294     # ARC Sizing
 295     sys.stdout.write("ARC Size:\t\t\t\t%s\t%s\n" % (
 296         arc['arc_sizing']['arc_size']['per'],
 297         arc['arc_sizing']['arc_size']['num']
 298         )
 299     )
 300     sys.stdout.write("\tTarget Size: (Adaptive)\t\t%s\t%s\n" % (
 301         arc['arc_sizing']['target_size']['per'],
 302         arc['arc_sizing']['target_size']['num'],
 303         )
 304     )
 305
 306     sys.stdout.write("\tMin Size (Hard Limit):\t\t%s\t%s\n" % (
 307         arc['arc_sizing']['target_min_size']['per'],
 308         arc['arc_sizing']['target_min_size']['num'],
 309         )
 310     )
 311
 312     sys.stdout.write("\tMax Size (High Water):\t\t%d:1\t%s\n" % (
 313         arc['arc_sizing']['target_max_size']['ratio'],
 314         arc['arc_sizing']['target_max_size']['num'],
 315         )
 316     )
 317
 318     sys.stdout.write("\nARC Size Breakdown:\n")
 319     sys.stdout.write("\tRecently Used Cache Size:\t%s\t%s\n" % (
 320         arc['arc_size_break']['recently_used_cache_size']['per'],
 321         arc['arc_size_break']['recently_used_cache_size']['num'],
 322         )
 323     )
 324     sys.stdout.write("\tFrequently Used Cache Size:\t%s\t%s\n" % (
 325         arc['arc_size_break']['frequently_used_cache_size']['per'],
 326         arc['arc_size_break']['frequently_used_cache_size']['num'],
 327         )
 328     )
 329
 330     sys.stdout.write("\n")
 331
 332     # ARC Hash Breakdown
 333     sys.stdout.write("ARC Hash Breakdown:\n")
 334     sys.stdout.write("\tElements Max:\t\t\t\t%s\n" %
 335                      arc['arc_hash_break']['elements_max'])
 336     sys.stdout.write("\tElements Current:\t\t%s\t%s\n" % (
 337         arc['arc_hash_break']['elements_current']['per'],
 338         arc['arc_hash_break']['elements_current']['num'],
 339         )
 340     )
 341     sys.stdout.write("\tCollisions:\t\t\t\t%s\n" %
 342                      arc['arc_hash_break']['collisions'])
 343     sys.stdout.write("\tChain Max:\t\t\t\t%s\n" %
 344                      arc['arc_hash_break']['chain_max'])
 345     sys.stdout.write("\tChains:\t\t\t\t\t%s\n" %
 346                      arc['arc_hash_break']['chains'])
 347
 348
 349 def get_arc_efficiency(Kstat):
 350     output = {}
 351
 352     arc_hits = Kstat["kstat.zfs.misc.arcstats.hits"]
 353     arc_misses = Kstat["kstat.zfs.misc.arcstats.misses"]
 354     demand_data_hits = Kstat["kstat.zfs.misc.arcstats.demand_data_hits"]
 355     demand_data_misses = Kstat["kstat.zfs.misc.arcstats.demand_data_misses"]
 356     demand_metadata_hits = Kstat[
 357         "kstat.zfs.misc.arcstats.demand_metadata_hits"
 358         ]
 359     demand_metadata_misses = Kstat[
 360         "kstat.zfs.misc.arcstats.demand_metadata_misses"
 361         ]
 362     mfu_ghost_hits = Kstat["kstat.zfs.misc.arcstats.mfu_ghost_hits"]
 363     mfu_hits = Kstat["kstat.zfs.misc.arcstats.mfu_hits"]
 364     mru_ghost_hits = Kstat["kstat.zfs.misc.arcstats.mru_ghost_hits"]
 365     mru_hits = Kstat["kstat.zfs.misc.arcstats.mru_hits"]
 366     prefetch_data_hits = Kstat["kstat.zfs.misc.arcstats.prefetch_data_hits"]
 367     prefetch_data_misses = Kstat[
 368         "kstat.zfs.misc.arcstats.prefetch_data_misses"
 369         ]
 370     prefetch_metadata_hits = Kstat[
 371         "kstat.zfs.misc.arcstats.prefetch_metadata_hits"
 372         ]
 373     prefetch_metadata_misses = Kstat[
 374         "kstat.zfs.misc.arcstats.prefetch_metadata_misses"
 375         ]
 376
 377     anon_hits = arc_hits - (
 378         mfu_hits + mru_hits + mfu_ghost_hits + mru_ghost_hits
 379         )
 380     arc_accesses_total = (arc_hits + arc_misses)
 381     demand_data_total = (demand_data_hits + demand_data_misses)
 382     prefetch_data_total = (prefetch_data_hits + prefetch_data_misses)
 383     real_hits = (mfu_hits + mru_hits)
 384
 385     output["total_accesses"] = fHits(arc_accesses_total)
 386     output["cache_hit_ratio"] = {
 387         'per': fPerc(arc_hits, arc_accesses_total),
 388         'num': fHits(arc_hits),
 389     }
 390     output["cache_miss_ratio"] = {
 391         'per': fPerc(arc_misses, arc_accesses_total),
 392         'num': fHits(arc_misses),
 393     }
 394     output["actual_hit_ratio"] = {
 395         'per': fPerc(real_hits, arc_accesses_total),
 396         'num': fHits(real_hits),
 397     }
 398     output["data_demand_efficiency"] = {
 399         'per': fPerc(demand_data_hits, demand_data_total),
 400         'num': fHits(demand_data_total),
 401     }
 402
 403     if prefetch_data_total > 0:
 404         output["data_prefetch_efficiency"] = {
 405             'per': fPerc(prefetch_data_hits, prefetch_data_total),
 406             'num': fHits(prefetch_data_total),
 407         }
 408
 409     if anon_hits > 0:
 410         output["cache_hits_by_cache_list"] = {}
 411         output["cache_hits_by_cache_list"]["anonymously_used"] = {
 412             'per': fPerc(anon_hits, arc_hits),
 413             'num': fHits(anon_hits),
 414         }
 415
 416     output["most_recently_used"] = {
 417         'per': fPerc(mru_hits, arc_hits),
 418         'num': fHits(mru_hits),
 419     }
 420     output["most_frequently_used"] = {
 421         'per': fPerc(mfu_hits, arc_hits),
 422         'num': fHits(mfu_hits),
 423     }
 424     output["most_recently_used_ghost"] = {
 425         'per': fPerc(mru_ghost_hits, arc_hits),
 426         'num': fHits(mru_ghost_hits),
 427     }
 428     output["most_frequently_used_ghost"] = {
 429         'per': fPerc(mfu_ghost_hits, arc_hits),
 430         'num': fHits(mfu_ghost_hits),
 431     }
 432
 433     output["cache_hits_by_data_type"] = {}
 434     output["cache_hits_by_data_type"]["demand_data"] = {
 435         'per': fPerc(demand_data_hits, arc_hits),
 436         'num': fHits(demand_data_hits),
 437     }
 438     output["cache_hits_by_data_type"]["prefetch_data"] = {
 439         'per': fPerc(prefetch_data_hits, arc_hits),
 440         'num': fHits(prefetch_data_hits),
 441     }
 442     output["cache_hits_by_data_type"]["demand_metadata"] = {
 443         'per': fPerc(demand_metadata_hits, arc_hits),
 444         'num': fHits(demand_metadata_hits),
 445     }
 446     output["cache_hits_by_data_type"]["prefetch_metadata"] = {
 447         'per': fPerc(prefetch_metadata_hits, arc_hits),
 448         'num': fHits(prefetch_metadata_hits),
 449     }
 450
 451     output["cache_misses_by_data_type"] = {}
 452     output["cache_misses_by_data_type"]["demand_data"] = {
 453         'per': fPerc(demand_data_misses, arc_misses),
 454         'num': fHits(demand_data_misses),
 455     }
 456     output["cache_misses_by_data_type"]["prefetch_data"] = {
 457         'per': fPerc(prefetch_data_misses, arc_misses),
 458         'num': fHits(prefetch_data_misses),
 459     }
 460     output["cache_misses_by_data_type"]["demand_metadata"] = {
 461         'per': fPerc(demand_metadata_misses, arc_misses),
 462         'num': fHits(demand_metadata_misses),
 463     }
 464     output["cache_misses_by_data_type"]["prefetch_metadata"] = {
 465         'per': fPerc(prefetch_metadata_misses, arc_misses),
 466         'num': fHits(prefetch_metadata_misses),
 467     }
 468
 469     return output
 470
 471
 472 def _arc_efficiency(Kstat):
 473     arc = get_arc_efficiency(Kstat)
 474
 475     sys.stdout.write("ARC Total accesses:\t\t\t\t\t%s\n" %
 476                      arc['total_accesses'])
 477     sys.stdout.write("\tCache Hit Ratio:\t\t%s\t%s\n" % (
 478         arc['cache_hit_ratio']['per'],
 479         arc['cache_hit_ratio']['num'],
 480         )
 481     )
 482     sys.stdout.write("\tCache Miss Ratio:\t\t%s\t%s\n" % (
 483         arc['cache_miss_ratio']['per'],
 484         arc['cache_miss_ratio']['num'],
 485         )
 486     )
 487
 488     sys.stdout.write("\tActual Hit Ratio:\t\t%s\t%s\n" % (
 489         arc['actual_hit_ratio']['per'],
 490         arc['actual_hit_ratio']['num'],
 491         )
 492     )
 493
 494     sys.stdout.write("\n")
 495     sys.stdout.write("\tData Demand Efficiency:\t\t%s\t%s\n" % (
 496         arc['data_demand_efficiency']['per'],
 497         arc['data_demand_efficiency']['num'],
 498         )
 499     )
 500
 501     if 'data_prefetch_efficiency' in arc:
 502         sys.stdout.write("\tData Prefetch Efficiency:\t%s\t%s\n" % (
 503             arc['data_prefetch_efficiency']['per'],
 504             arc['data_prefetch_efficiency']['num'],
 505             )
 506         )
 507     sys.stdout.write("\n")
 508
 509     sys.stdout.write("\tCACHE HITS BY CACHE LIST:\n")
 510     if 'cache_hits_by_cache_list' in arc:
 511         sys.stdout.write("\t  Anonymously Used:\t\t%s\t%s\n" % (
 512             arc['cache_hits_by_cache_list']['anonymously_used']['per'],
 513             arc['cache_hits_by_cache_list']['anonymously_used']['num'],
 514             )
 515         )
 516     sys.stdout.write("\t  Most Recently Used:\t\t%s\t%s\n" % (
 517         arc['most_recently_used']['per'],
 518         arc['most_recently_used']['num'],
 519         )
 520     )
 521     sys.stdout.write("\t  Most Frequently Used:\t\t%s\t%s\n" % (
 522         arc['most_frequently_used']['per'],
 523         arc['most_frequently_used']['num'],
 524         )
 525     )
 526     sys.stdout.write("\t  Most Recently Used Ghost:\t%s\t%s\n" % (
 527         arc['most_recently_used_ghost']['per'],
 528         arc['most_recently_used_ghost']['num'],
 529         )
 530     )
 531     sys.stdout.write("\t  Most Frequently Used Ghost:\t%s\t%s\n" % (
 532         arc['most_frequently_used_ghost']['per'],
 533         arc['most_frequently_used_ghost']['num'],
 534         )
 535     )
 536
 537     sys.stdout.write("\n\tCACHE HITS BY DATA TYPE:\n")
 538     sys.stdout.write("\t  Demand Data:\t\t\t%s\t%s\n" % (
 539         arc["cache_hits_by_data_type"]['demand_data']['per'],
 540         arc["cache_hits_by_data_type"]['demand_data']['num'],
 541         )
 542     )
 543     sys.stdout.write("\t  Prefetch Data:\t\t%s\t%s\n" % (
 544         arc["cache_hits_by_data_type"]['prefetch_data']['per'],
 545         arc["cache_hits_by_data_type"]['prefetch_data']['num'],
 546         )
 547     )
 548     sys.stdout.write("\t  Demand Metadata:\t\t%s\t%s\n" % (
 549         arc["cache_hits_by_data_type"]['demand_metadata']['per'],
 550         arc["cache_hits_by_data_type"]['demand_metadata']['num'],
 551         )
 552     )
 553     sys.stdout.write("\t  Prefetch Metadata:\t\t%s\t%s\n" % (
 554         arc["cache_hits_by_data_type"]['prefetch_metadata']['per'],
 555         arc["cache_hits_by_data_type"]['prefetch_metadata']['num'],
 556         )
 557     )
 558
 559     sys.stdout.write("\n\tCACHE MISSES BY DATA TYPE:\n")
 560     sys.stdout.write("\t  Demand Data:\t\t\t%s\t%s\n" % (
 561         arc["cache_misses_by_data_type"]['demand_data']['per'],
 562         arc["cache_misses_by_data_type"]['demand_data']['num'],
 563         )
 564     )
 565     sys.stdout.write("\t  Prefetch Data:\t\t%s\t%s\n" % (
 566         arc["cache_misses_by_data_type"]['prefetch_data']['per'],
 567         arc["cache_misses_by_data_type"]['prefetch_data']['num'],
 568         )
 569     )
 570     sys.stdout.write("\t  Demand Metadata:\t\t%s\t%s\n" % (
 571         arc["cache_misses_by_data_type"]['demand_metadata']['per'],
 572         arc["cache_misses_by_data_type"]['demand_metadata']['num'],
 573         )
 574     )
 575     sys.stdout.write("\t  Prefetch Metadata:\t\t%s\t%s\n" % (
 576         arc["cache_misses_by_data_type"]['prefetch_metadata']['per'],
 577         arc["cache_misses_by_data_type"]['prefetch_metadata']['num'],
 578         )
 579     )
 580
 581
 582 def get_l2arc_summary(Kstat):
 583     output = {}
 584
 585     l2_abort_lowmem = Kstat["kstat.zfs.misc.arcstats.l2_abort_lowmem"]
 586     l2_cksum_bad = Kstat["kstat.zfs.misc.arcstats.l2_cksum_bad"]
 587     l2_evict_lock_retry = Kstat["kstat.zfs.misc.arcstats.l2_evict_lock_retry"]
 588     l2_evict_reading = Kstat["kstat.zfs.misc.arcstats.l2_evict_reading"]
 589     l2_feeds = Kstat["kstat.zfs.misc.arcstats.l2_feeds"]
 590     l2_free_on_write = Kstat["kstat.zfs.misc.arcstats.l2_free_on_write"]
 591     l2_hdr_size = Kstat["kstat.zfs.misc.arcstats.l2_hdr_size"]
 592     l2_hits = Kstat["kstat.zfs.misc.arcstats.l2_hits"]
 593     l2_io_error = Kstat["kstat.zfs.misc.arcstats.l2_io_error"]
 594     l2_misses = Kstat["kstat.zfs.misc.arcstats.l2_misses"]
 595     l2_rw_clash = Kstat["kstat.zfs.misc.arcstats.l2_rw_clash"]
 596     l2_size = Kstat["kstat.zfs.misc.arcstats.l2_size"]
 597     l2_asize = Kstat["kstat.zfs.misc.arcstats.l2_asize"]
 598     l2_writes_done = Kstat["kstat.zfs.misc.arcstats.l2_writes_done"]
 599     l2_writes_error = Kstat["kstat.zfs.misc.arcstats.l2_writes_error"]
 600     l2_writes_sent = Kstat["kstat.zfs.misc.arcstats.l2_writes_sent"]
 601
 602     l2_access_total = (l2_hits + l2_misses)
 603     output['l2_health_count'] = (l2_writes_error + l2_cksum_bad + l2_io_error)
 604
 605     output['l2_access_total'] = l2_access_total
 606     output['l2_size'] = l2_size
 607     output['l2_asize'] = l2_asize
 608
 609     if l2_size > 0 and l2_access_total > 0:
 610
 611         if output['l2_health_count'] > 0:
 612             output["health"] = "DEGRADED"
 613         else:
 614             output["health"] = "HEALTHY"
 615
 616         output["low_memory_aborts"] = fHits(l2_abort_lowmem)
 617         output["free_on_write"] = fHits(l2_free_on_write)
 618         output["rw_clashes"] = fHits(l2_rw_clash)
 619         output["bad_checksums"] = fHits(l2_cksum_bad)
 620         output["io_errors"] = fHits(l2_io_error)
 621
 622         output["l2_arc_size"] = {}
 623         output["l2_arc_size"]["adative"] = fBytes(l2_size)
 624         output["l2_arc_size"]["actual"] = {
 625             'per': fPerc(l2_asize, l2_size),
 626             'num': fBytes(l2_asize)
 627             }
 628         output["l2_arc_size"]["head_size"] = {
 629             'per': fPerc(l2_hdr_size, l2_size),
 630             'num': fBytes(l2_hdr_size),
 631         }
 632
 633         output["l2_arc_evicts"] = {}
 634         output["l2_arc_evicts"]['lock_retries'] = fHits(l2_evict_lock_retry)
 635         output["l2_arc_evicts"]['reading'] = fHits(l2_evict_reading)
 636
 637         output['l2_arc_breakdown'] = {}
 638         output['l2_arc_breakdown']['value'] = fHits(l2_access_total)
 639         output['l2_arc_breakdown']['hit_ratio'] = {
 640             'per': fPerc(l2_hits, l2_access_total),
 641             'num': fHits(l2_hits),
 642         }
 643         output['l2_arc_breakdown']['miss_ratio'] = {
 644             'per': fPerc(l2_misses, l2_access_total),
 645             'num': fHits(l2_misses),
 646         }
 647         output['l2_arc_breakdown']['feeds'] = fHits(l2_feeds)
 648
 649         output['l2_arc_buffer'] = {}
 650
 651         output['l2_arc_writes'] = {}
 652         output['l2_writes_done'] = l2_writes_done
 653         output['l2_writes_sent'] = l2_writes_sent
 654         if l2_writes_done != l2_writes_sent:
 655             output['l2_arc_writes']['writes_sent'] = {
 656                 'value': "FAULTED",
 657                 'num': fHits(l2_writes_sent),
 658             }
 659             output['l2_arc_writes']['done_ratio'] = {
 660                 'per': fPerc(l2_writes_done, l2_writes_sent),
 661                 'num': fHits(l2_writes_done),
 662             }
 663             output['l2_arc_writes']['error_ratio'] = {
 664                 'per': fPerc(l2_writes_error, l2_writes_sent),
 665                 'num': fHits(l2_writes_error),
 666             }
 667         else:
 668             output['l2_arc_writes']['writes_sent'] = {
 669                 'per': fPerc(100),
 670                 'num': fHits(l2_writes_sent),
 671             }
 672
 673     return output
 674
 675
 676 def _l2arc_summary(Kstat):
 677
 678     arc = get_l2arc_summary(Kstat)
 679
 680     if arc['l2_size'] > 0 and arc['l2_access_total'] > 0:
 681         sys.stdout.write("L2 ARC Summary: ")
 682         if arc['l2_health_count'] > 0:
 683             sys.stdout.write("(DEGRADED)\n")
 684         else:
 685             sys.stdout.write("(HEALTHY)\n")
 686         sys.stdout.write("\tLow Memory Aborts:\t\t\t%s\n" %
 687                          arc['low_memory_aborts'])
 688         sys.stdout.write("\tFree on Write:\t\t\t\t%s\n" % arc['free_on_write'])
 689         sys.stdout.write("\tR/W Clashes:\t\t\t\t%s\n" % arc['rw_clashes'])
 690         sys.stdout.write("\tBad Checksums:\t\t\t\t%s\n" % arc['bad_checksums'])
 691         sys.stdout.write("\tIO Errors:\t\t\t\t%s\n" % arc['io_errors'])
 692         sys.stdout.write("\n")
 693
 694         sys.stdout.write("L2 ARC Size: (Adaptive)\t\t\t\t%s\n" %
 695                          arc["l2_arc_size"]["adative"])
 696         sys.stdout.write("\tCompressed:\t\t\t%s\t%s\n" % (
 697             arc["l2_arc_size"]["actual"]["per"],
 698             arc["l2_arc_size"]["actual"]["num"],
 699             )
 700         )
 701         sys.stdout.write("\tHeader Size:\t\t\t%s\t%s\n" % (
 702             arc["l2_arc_size"]["head_size"]["per"],
 703             arc["l2_arc_size"]["head_size"]["num"],
 704             )
 705         )
 706         sys.stdout.write("\n")
 707
 708         if arc["l2_arc_evicts"]['lock_retries'] != '0' or \
 709            arc["l2_arc_evicts"]["reading"] != '0':
 710             sys.stdout.write("L2 ARC Evicts:\n")
 711             sys.stdout.write("\tLock Retries:\t\t\t\t%s\n" %
 712                              arc["l2_arc_evicts"]['lock_retries'])
 713             sys.stdout.write("\tUpon Reading:\t\t\t\t%s\n" %
 714                              arc["l2_arc_evicts"]["reading"])
 715             sys.stdout.write("\n")
 716
 717         sys.stdout.write("L2 ARC Breakdown:\t\t\t\t%s\n" %
 718                          arc['l2_arc_breakdown']['value'])
 719         sys.stdout.write("\tHit Ratio:\t\t\t%s\t%s\n" % (
 720             arc['l2_arc_breakdown']['hit_ratio']['per'],
 721             arc['l2_arc_breakdown']['hit_ratio']['num'],
 722             )
 723         )
 724
 725         sys.stdout.write("\tMiss Ratio:\t\t\t%s\t%s\n" % (
 726             arc['l2_arc_breakdown']['miss_ratio']['per'],
 727             arc['l2_arc_breakdown']['miss_ratio']['num'],
 728             )
 729         )
 730
 731         sys.stdout.write("\tFeeds:\t\t\t\t\t%s\n" %
 732                          arc['l2_arc_breakdown']['feeds'])
 733         sys.stdout.write("\n")
 734
 735         sys.stdout.write("L2 ARC Writes:\n")
 736         if arc['l2_writes_done'] != arc['l2_writes_sent']:
 737             sys.stdout.write("\tWrites Sent: (%s)\t\t\t\t%s\n" % (
 738                 arc['l2_arc_writes']['writes_sent']['value'],
 739                 arc['l2_arc_writes']['writes_sent']['num'],
 740                 )
 741             )
 742             sys.stdout.write("\t  Done Ratio:\t\t\t%s\t%s\n" % (
 743                 arc['l2_arc_writes']['done_ratio']['per'],
 744                 arc['l2_arc_writes']['done_ratio']['num'],
 745                 )
 746             )
 747             sys.stdout.write("\t  Error Ratio:\t\t\t%s\t%s\n" % (
 748                 arc['l2_arc_writes']['error_ratio']['per'],
 749                 arc['l2_arc_writes']['error_ratio']['num'],
 750                 )
 751             )
 752         else:
 753             sys.stdout.write("\tWrites Sent:\t\t\t%s\t%s\n" % (
 754                 arc['l2_arc_writes']['writes_sent']['per'],
 755                 arc['l2_arc_writes']['writes_sent']['num'],
 756                 )
 757             )
 758
 759
 760 def get_dmu_summary(Kstat):
 761     output = {}
 762
 763     zfetch_hits = Kstat["kstat.zfs.misc.zfetchstats.hits"]
 764     zfetch_misses = Kstat["kstat.zfs.misc.zfetchstats.misses"]
 765
 766     zfetch_access_total = (zfetch_hits + zfetch_misses)
 767     output['zfetch_access_total'] = zfetch_access_total
 768
 769     if zfetch_access_total > 0:
 770         output['dmu'] = {}
 771         output['dmu']['efficiency'] = {}
 772         output['dmu']['efficiency']['value'] = fHits(zfetch_access_total)
 773         output['dmu']['efficiency']['hit_ratio'] = {
 774             'per': fPerc(zfetch_hits, zfetch_access_total),
 775             'num': fHits(zfetch_hits),
 776         }
 777         output['dmu']['efficiency']['miss_ratio'] = {
 778             'per': fPerc(zfetch_misses, zfetch_access_total),
 779             'num': fHits(zfetch_misses),
 780         }
 781
 782     return output
 783
 784
 785 def _dmu_summary(Kstat):
 786
 787     arc = get_dmu_summary(Kstat)
 788
 789     if arc['zfetch_access_total'] > 0:
 790         sys.stdout.write("DMU Prefetch Efficiency:\t\t\t\t\t%s\n" %
 791                          arc['dmu']['efficiency']['value'])
 792         sys.stdout.write("\tHit Ratio:\t\t\t%s\t%s\n" % (
 793             arc['dmu']['efficiency']['hit_ratio']['per'],
 794             arc['dmu']['efficiency']['hit_ratio']['num'],
 795             )
 796         )
 797         sys.stdout.write("\tMiss Ratio:\t\t\t%s\t%s\n" % (
 798             arc['dmu']['efficiency']['miss_ratio']['per'],
 799             arc['dmu']['efficiency']['miss_ratio']['num'],
 800             )
 801         )
 802
 803         sys.stdout.write("\n")
 804
 805
 806 def get_vdev_summary(Kstat):
 807     output = {}
 808
 809     vdev_cache_delegations = \
 810         Kstat["kstat.zfs.misc.vdev_cache_stats.delegations"]
 811     vdev_cache_misses = Kstat["kstat.zfs.misc.vdev_cache_stats.misses"]
 812     vdev_cache_hits = Kstat["kstat.zfs.misc.vdev_cache_stats.hits"]
 813     vdev_cache_total = (vdev_cache_misses + vdev_cache_hits +
 814                         vdev_cache_delegations)
 815
 816     output['vdev_cache_total'] = vdev_cache_total
 817
 818     if vdev_cache_total > 0:
 819         output['summary'] = fHits(vdev_cache_total)
 820         output['hit_ratio'] = {
 821             'per': fPerc(vdev_cache_hits, vdev_cache_total),
 822             'num': fHits(vdev_cache_hits),
 823         }
 824         output['miss_ratio'] = {
 825             'per': fPerc(vdev_cache_misses, vdev_cache_total),
 826             'num': fHits(vdev_cache_misses),
 827         }
 828         output['delegations'] = {
 829             'per': fPerc(vdev_cache_delegations, vdev_cache_total),
 830             'num': fHits(vdev_cache_delegations),
 831         }
 832
 833     return output
 834
 835
 836 def _vdev_summary(Kstat):
 837     arc = get_vdev_summary(Kstat)
 838
 839     if arc['vdev_cache_total'] > 0:
 840         sys.stdout.write("VDEV Cache Summary:\t\t\t\t%s\n" % arc['summary'])
 841         sys.stdout.write("\tHit Ratio:\t\t\t%s\t%s\n" % (
 842             arc['hit_ratio']['per'],
 843             arc['hit_ratio']['num'],
 844         ))
 845         sys.stdout.write("\tMiss Ratio:\t\t\t%s\t%s\n" % (
 846             arc['miss_ratio']['per'],
 847             arc['miss_ratio']['num'],
 848         ))
 849         sys.stdout.write("\tDelegations:\t\t\t%s\t%s\n" % (
 850             arc['delegations']['per'],
 851             arc['delegations']['num'],
 852         ))
 853
 854
 855 def _tunable_summary(Kstat):
 856     global show_tunable_descriptions
 857     global alternate_tunable_layout
 858
 859     names = listdir("/sys/module/zfs/parameters/")
 860
 861     values = {}
 862     for name in names:
 863         with open("/sys/module/zfs/parameters/" + name) as f:
 864             value = f.read()
 865         values[name] = value.strip()
 866
 867     descriptions = {}
 868
 869     if show_tunable_descriptions:
 870         try:
 871             command = ["/sbin/modinfo", "zfs", "-0"]
 872             p = Popen(command, stdin=PIPE, stdout=PIPE,
 873                       stderr=PIPE, shell=False, close_fds=True)
 874             p.wait()
 875
 876             description_list = p.communicate()[0].strip().split('\0')
 877
 878             if p.returncode == 0:
 879                 for tunable in description_list:
 880                     if tunable[0:5] == 'parm:':
 881                         tunable = tunable[5:].strip()
 882                         name, description = tunable.split(':', 1)
 883                         if not description:
 884                             description = "Description unavailable"
 885                         descriptions[name] = description
 886             else:
 887                 sys.stderr.write("%s: '%s' exited with code %i\n" %
 888                                  (sys.argv[0], command[0], p.returncode))
 889                 sys.stderr.write("Tunable descriptions will be disabled.\n")
 890         except OSError as e:
 891             sys.stderr.write("%s: Cannot run '%s': %s\n" %
 892                              (sys.argv[0], command[0], e.strerror))
 893             sys.stderr.write("Tunable descriptions will be disabled.\n")
 894
 895     sys.stdout.write("ZFS Tunable:\n")
 896     for name in names:
 897         if not name:
 898             continue
 899
 900         format = "\t%-50s%s\n"
 901         if alternate_tunable_layout:
 902             format = "\t%s=%s\n"
 903
 904         if show_tunable_descriptions and name in descriptions:
 905             sys.stdout.write("\t# %s\n" % descriptions[name])
 906
 907         sys.stdout.write(format % (name, values[name]))
 908
 909
 910 unSub = [
 911     _arc_summary,
 912     _arc_efficiency,
 913     _l2arc_summary,
 914     _dmu_summary,
 915     _vdev_summary,
 916     _tunable_summary
 917 ]
 918
 919
 920 def zfs_header():
 921     daydate = time.strftime("%a %b %d %H:%M:%S %Y")
 922
 923     div1()
 924     sys.stdout.write("ZFS Subsystem Report\t\t\t\t%s" % daydate)
 925     div2()
 926
 927
 928 def usage():
 929     sys.stdout.write("Usage: arc_summary.py [-h] [-a] [-d] [-p PAGE]\n\n")
 930     sys.stdout.write("\t -h, --help           : "
 931                      "Print this help message and exit\n")
 932     sys.stdout.write("\t -a, --alternate      : "
 933                      "Show an alternate sysctl layout\n")
 934     sys.stdout.write("\t -d, --description    : "
 935                      "Show the sysctl descriptions\n")
 936     sys.stdout.write("\t -p PAGE, --page=PAGE : "
 937                      "Select a single output page to display,\n")
 938     sys.stdout.write("\t                        "
 939                      "should be an integer between 1 and " +
 940                      str(len(unSub)) + "\n\n")
 941     sys.stdout.write("Examples:\n")
 942     sys.stdout.write("\tarc_summary.py -a\n")
 943     sys.stdout.write("\tarc_summary.py -p 4\n")
 944     sys.stdout.write("\tarc_summary.py -ad\n")
 945     sys.stdout.write("\tarc_summary.py --page=2\n")
 946
 947
 948 def main():
 949     global show_tunable_descriptions
 950     global alternate_tunable_layout
 951
 952     opts, args = getopt.getopt(
 953         sys.argv[1:], "adp:h", ["alternate", "description", "page=", "help"]
 954     )
 955
 956     args = {}
 957     for opt, arg in opts:
 958         if opt in ('-a', '--alternate'):
 959             args['a'] = True
 960         if opt in ('-d', '--description'):
 961             args['d'] = True
 962         if opt in ('-p', '--page'):
 963             args['p'] = arg
 964         if opt in ('-h', '--help'):
 965             usage()
 966             sys.exit()
 967
 968     Kstat = get_Kstat()
 969
 970     alternate_tunable_layout = 'a' in args
 971     show_tunable_descriptions = 'd' in args
 972
 973     pages = []
 974
 975     if 'p' in args:
 976         try:
 977             pages.append(unSub[int(args['p']) - 1])
 978         except IndexError:
 979             sys.stderr.write('the argument to -p must be between 1 and ' +
 980                              str(len(unSub)) + '\n')
 981             sys.exit()
 982     else:
 983         pages = unSub
 984
 985     zfs_header()
 986     for page in pages:
 987         page(Kstat)
 988         div2()
 989
 990 if __name__ == '__main__':
 991     main()