user     system      total        real
Set (libmemcache)              0.070000   0.020000   0.090000 (  0.192847)
Set (pureruby)                 0.390000   0.220000   0.610000 (  1.023459)
Get single key (libmemcache)   0.120000   0.310000   0.430000 (  0.796311)
Get single key (pureruby)      0.260000   0.210000   0.470000 (  0.821624)
Get&Set (libmemcache)          0.250000   0.420000   0.670000 (  1.323434)
Get&Set (pureruby)             0.830000   0.430000   1.260000 (  2.164864)