Apache forking and preloading

[Oliver Bock]

If I use RSourceOnStartup, will the R source be run once in each Apache worker process, or will it run once while Apache starts, and then be copied to each process via fork()?  I ask because I think I can speed up my R code by preloading all the R libraries I might need in my startup script.  This would be OK because fork()'s copy-on-write semantics mean that most of what I load into memory will be shared between processes.

On the other hand, if my startup code is run once for each process then I will be using lots of RAM by loading every library many times.

  Oliver