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gerrit-public.fairphone.software / platform / external / fio / cdcac5cf0e9262105e676874d11c4639a80574eb
commitcdcac5cf0e9262105e676874d11c4639a80574eb[log] [tgz]
authorYu-ju Hong <yjhong@google.com>Sat Jul 30 09:18:13 2011 +0200
committerJens Axboe <jaxboe@fusionio.com>Sat Jul 30 09:18:13 2011 +0200
tree100781719726244092f0afbc17e678521901905d
parent31d23f47d5ee53f74fbf20e17e83c7cb42e39878 [diff]
stats: Fix computation of summed standard deviation

Fix the computation of standard deviation for a group
of jobs. Please see the below link for the
approximation formula used.
<http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance

The formula was originally presented here:
<ftp://reports.stanford.edu/pub/cstr/reports/cs/tr/79/773/
CS-TR-79-773.pdf>

Signed-off-by: Yu-ju Hong <yjhong@google.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
1 file changed
tree: 100781719726244092f0afbc17e678521901905d
  1. arch/
  2. compiler/
  3. crc/
  4. engines/
  5. examples/
  6. lib/
  7. os/
  8. profiles/
  9. .gitignore
  10. blktrace.c
  11. blktrace_api.h
  12. cgroup.c
  13. cgroup.h
  14. COPYING
  15. debug.c
  16. debug.h
  17. diskutil.c
  18. diskutil.h
  19. eta.c
  20. fifo.c
  21. fifo.h
  22. file.h
  23. filehash.c
  24. filehash.h
  25. filesetup.c
  26. fio.1
  27. fio.c
  28. fio.h
  29. fio_generate_plots
  30. fio_generate_plots.1
  31. flist.h
  32. gettime.c
  33. hash.h
  34. helpers.c
  35. helpers.h
  36. HOWTO
  37. init.c
  38. io_ddir.h
  39. io_u.c
  40. ioengine.h
  41. ioengines.c
  42. iolog.h
  43. log.c
  44. log.h
  45. Makefile
  46. memalign.c
  47. memalign.h
  48. memory.c
  49. mutex.c
  50. mutex.h
  51. options.c
  52. options.h
  53. parse.c
  54. parse.h
  55. profile.c
  56. profile.h
  57. rbtree.c
  58. rbtree.h
  59. README
  60. REPORTING-BUGS
  61. smalloc.c
  62. smalloc.h
  63. stat.c
  64. time.c
  65. time.h
  66. trim.c
  67. trim.h
  68. verify.c
  69. verify.h