rosmongolog_mp: one process per topic
rosmongolog_mp: one process per topic

Since the other approaches failed to deliver the required performance
try the other extreme of having one worker process per topic. Requires
to postpone ROS initialization until after forking or it wouldn't work
(I suspect worker threads must be setup per process or so).

Jailander/mongodb_store,Jailander/mongodb_store,jeansebbaklouti/mongodb_store,strands-project/mongodb_store,sevenbitbyte/mongodb_store,nilsbore/mongodb_store,hawesie/mongodb_store,cburbridge/mongodb_store,hawesie/mongodb_store,strands-project/mongodb_store,sevenbitbyte/mongodb_store,jeansebbaklouti/mongodb_store,cburbridge/mongodb_store,nilsbore/mongodb_store