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a guest Feb 5th, 2012 672 Never
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  1. sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux; time sync
  2.  
  3.  
  4.  
  5. without discard:
  6.  
  7. [root@moar tmp]# sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux-3.2.4; time sync
  8.  
  9. real    0m12.085s
  10. user    0m0.233s
  11. sys     0m2.810s
  12.  
  13. real    0m0.798s
  14. user    0m0.000s
  15. sys     0m0.023s
  16.  
  17. real    0m1.170s
  18. user    0m0.037s
  19. sys     0m0.933s
  20.  
  21. real    0m0.311s
  22. user    0m0.000s
  23. sys     0m0.020s
  24. [root@moar tmp]# ls
  25. linux-3.2.4.tar
  26. [root@moar tmp]# sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux-3.2.4; time sync
  27.  
  28. real    0m10.555s
  29. user    0m0.230s
  30. sys     0m1.957s
  31.  
  32. real    0m0.762s
  33. user    0m0.000s
  34. sys     0m0.020s
  35.  
  36. real    0m1.097s
  37. user    0m0.023s
  38. sys     0m0.907s
  39.  
  40. real    0m0.299s
  41. user    0m0.000s
  42. sys     0m0.020s
  43. [root@moar tmp]# sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux-3.2.4; time sync
  44.  
  45. real    0m10.720s
  46. user    0m0.213s
  47. sys     0m1.980s
  48.  
  49. real    0m0.869s
  50. user    0m0.000s
  51. sys     0m0.023s
  52.  
  53. real    0m1.148s
  54. user    0m0.023s
  55. sys     0m0.890s
  56.  
  57. real    0m0.247s
  58. user    0m0.000s
  59. sys     0m0.020s
  60.  
  61.  
  62. with discard:
  63. /dev/mapper/home on /home type ext4 (rw,nodiratime,relatime,user_xattr,acl,barrier=1,data=ordered,discard)
  64.  
  65.  
  66.  
  67. [root@moar tmp]# sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux-3.2.4; time sync
  68.  
  69. real    0m10.568s
  70. user    0m0.237s
  71. sys     0m1.950s
  72.  
  73. real    0m0.829s
  74. user    0m0.000s
  75. sys     0m0.020s
  76.  
  77. real    0m1.110s
  78. user    0m0.007s
  79. sys     0m0.910s
  80.  
  81. real    0m12.236s
  82. user    0m0.000s
  83. sys     0m0.023s
  84. [root@moar tmp]# sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux-3.2.4; time sync
  85.  
  86. real    0m9.902s
  87. user    0m0.173s
  88. sys     0m1.990s
  89.  
  90. real    0m0.861s
  91. user    0m0.000s
  92. sys     0m0.027s
  93.  
  94. real    0m1.143s
  95. user    0m0.030s
  96. sys     0m0.933s
  97.  
  98. real    0m12.148s
  99. user    0m0.000s
  100. sys     0m0.017s
  101. [root@moar tmp]# sync; echo 3 > /proc/sys/vm/drop_caches; time tar xf linux-3.2.4.tar; time sync; time rm -rf linux-3.2.4; time sync
  102.  
  103. real    0m10.341s
  104. user    0m0.187s
  105. sys     0m1.983s
  106.  
  107. real    0m0.828s
  108. user    0m0.000s
  109. sys     0m0.020s
  110.  
  111. real    0m1.182s
  112. user    0m0.033s
  113. sys     0m0.930s
  114.  
  115. real    0m12.189s
  116. user    0m0.000s
  117. sys     0m0.017s
  118. [root@moar tmp]#
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