https://gist.github.com/1484985 - testing original and patched rubies with the same gemset

rails runner - speed up ~25% and memory improvement ~30%

ruby-1.9.3-p0
        3.27 real         2.45 user         0.40 sys
  51400704  maximum resident set size
        2.84 real         2.44 user         0.33 sys
  55898112  maximum resident set size
        2.77 real         2.42 user         0.32 sys
  55369728  maximum resident set size
        2.77 real         2.40 user         0.32 sys
  57630720  maximum resident set size
        3.22 real         2.46 user         0.33 sys
  52269056  maximum resident set size

ruby-1.9.3-p0-patched
        2.56 real         1.74 user         0.38 sys
  38146048  maximum resident set size
        2.13 real         1.77 user         0.29 sys
  38547456  maximum resident set size
        2.10 real         1.77 user         0.29 sys
  38817792  maximum resident set size
        2.10 real         1.75 user         0.29 sys
  38871040  maximum resident set size
        2.08 real         1.75 user         0.28 sys
  38359040  maximum resident set size

rake test non-rails project - speed up ~20% and memory improvement ~3%

ruby-1.9.3-p0
       11.80 real         6.75 user         1.07 sys
  65499136  maximum resident set size
       11.66 real         6.81 user         1.05 sys
  71368704  maximum resident set size
       11.64 real         6.79 user         1.06 sys
  68411392  maximum resident set size
       10.63 real         6.71 user         0.87 sys
  68292608  maximum resident set size
       10.25 real         6.72 user         0.75 sys
  71446528  maximum resident set size

ruby-1.9.3-p0-patched
        9.41 real         5.92 user         0.84 sys
  66998272  maximum resident set size
        9.15 real         5.93 user         0.75 sys
  65863680  maximum resident set size
        8.90 real         5.88 user         0.74 sys
  67022848  maximum resident set size
        9.00 real         5.92 user         0.75 sys
  67956736  maximum resident set size
        8.81 real         5.85 user         0.72 sys
  67665920  maximum resident set size

rake test rails project - speed up ~25% and memory improvement ~7%

ruby-1.9.3-p0
       12.70 real         9.83 user         1.52 sys
  65171456  maximum resident set size
       11.62 real         9.84 user         1.31 sys
  67551232  maximum resident set size
       11.43 real         9.79 user         1.34 sys
  65863680  maximum resident set size
       11.53 real         9.84 user         1.34 sys
  66617344  maximum resident set size
       11.44 real         9.88 user         1.30 sys
  66379776  maximum resident set size

ruby-1.9.3-p0-patched
        9.59 real         7.45 user         1.33 sys
  62472192  maximum resident set size
        8.70 real         7.32 user         1.23 sys
  62156800  maximum resident set size
        8.77 real         7.37 user         1.24 sys
  64466944  maximum resident set size
        8.81 real         7.39 user         1.25 sys
  63504384  maximum resident set size
        8.99 real         7.41 user         1.24 sys
  61767680  maximum resident set size