0.md

Compare rails runner on 1.9.3 and 1.9.3 with performance patch by funny-falcon (installation guide).

Conclusion: use patch by falcon, use zeus.

2.md

$ rbenv versions:

 1.9.2-p320
* 1.9.3-p194 (set by RBENV_VERSION environment variable)
 1.9.3-p194-perf

$ time rails runner "User.count":

rails runner "User.count"  7.96s user 1.29s system 89% cpu 10.314 total

$ time zeus runner "User.count":

zeus runner "User.count"  0.30s user 0.06s system 78% cpu 0.451 total

3.md

$ rbenv versions:

 1.9.2-p320
 1.9.3-p194
* 1.9.3-p194-perf (set by RBENV_VERSION environment variable)

$ time rails runner "User.count":

rails runner "User.count"  3.95s user 0.98s system 99% cpu 4.954 total

$ time zeus runner "User.count":

zeus runner "User.count"  0.13s user 0.04s system 37% cpu 0.446 total