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kernel / pub / scm / linux / kernel / git / axboe / fio / refs/heads/rand-zones
commit5e230fd57caa041145fb14926f47712f36a09c5e[log] [tgz]
authorJens Axboe <axboe@fb.com>Fri Mar 04 13:47:12 2016 -0700
committerJens Axboe <axboe@fb.com>Fri Mar 04 13:47:12 2016 -0700
treee5192ef672326867995e032415d619df728a0299
parent993930644e248d6d3c5e7a2da13b3e53aac10547 [diff]
Pre-generate access tables for zoned random distribution

If we have a lot of zones, then the looping to find and sum our
correct one eats some CPU cycles. On a null workload with 10 zones,
it was about a 20% reduction in performance.

So cache the state information, by pre-generating the tables. This
makes it so that there's no difference in performance between running
without zones, or with tens of zones.

Signed-off-by: Jens Axboe <axboe@fb.com>
3 files changed
tree: e5192ef672326867995e032415d619df728a0299
  1. arch/
  2. compiler/
  3. crc/
  4. engines/
  5. examples/
  6. exp/
  7. lib/
  8. os/
  9. oslib/
  10. profiles/
  11. t/
  12. tools/
  13. .gitignore
  14. backend.c
  15. blktrace.c
  16. blktrace_api.h
  17. cairo_text_helpers.c
  18. cairo_text_helpers.h
  19. cconv.c
  20. cgroup.c
  21. cgroup.h
  22. client.c
  23. client.h
  24. configure
  25. COPYING
  26. debug.c
  27. debug.h
  28. diskutil.c
  29. diskutil.h
  30. err.h
  31. eta.c
  32. fifo.c
  33. fifo.h
  34. file.h
  35. filehash.c
  36. filehash.h
  37. filelock.c
  38. filelock.h
  39. filesetup.c
  40. FIO-VERSION-GEN
  41. fio.1
  42. fio.c
  43. fio.h
  44. fio_time.h
  45. flist.h
  46. flow.c
  47. flow.h
  48. gclient.c
  49. gclient.h
  50. gcompat.c
  51. gcompat.h
  52. gerror.c
  53. gerror.h
  54. gettime-thread.c
  55. gettime.c
  56. gettime.h
  57. GFIO-TODO
  58. gfio.c
  59. gfio.h
  60. ghelpers.c
  61. ghelpers.h
  62. goptions.c
  63. goptions.h
  64. graph.c
  65. graph.h
  66. hash.h
  67. helpers.c
  68. helpers.h
  69. HOWTO
  70. idletime.c
  71. idletime.h
  72. init.c
  73. io_ddir.h
  74. io_u.c
  75. io_u_queue.c
  76. io_u_queue.h
  77. ioengine.h
  78. ioengines.c
  79. iolog.c
  80. iolog.h
  81. json.c
  82. json.h
  83. libfio.c
  84. log.c
  85. log.h
  86. Makefile
  87. memory.c
  88. minmax.h
  89. MORAL-LICENSE
  90. mutex.c
  91. mutex.h
  92. optgroup.c
  93. optgroup.h
  94. options.c
  95. options.h
  96. parse.c
  97. parse.h
  98. printing.c
  99. printing.h
  100. profile.c
  101. profile.h
  102. rate-submit.c
  103. rate-submit.h
  104. README
  105. REPORTING-BUGS
  106. SERVER-TODO
  107. server.c
  108. server.h
  109. smalloc.c
  110. smalloc.h
  111. stat.c
  112. stat.h
  113. td_error.c
  114. td_error.h
  115. thread_options.h
  116. tickmarks.c
  117. tickmarks.h
  118. time.c
  119. trim.c
  120. trim.h
  121. verify-state.h
  122. verify.c
  123. verify.h
  124. workqueue.c
  125. workqueue.h