one worker per machine per topology, is it still recommended?

[이승진]

 I read articles about this before suggesting this.
 
And I tried to run a topology in 2 workers in a same node, but performance was 
bad at that moment, even though resource usage was not that high.
(Sorry that I cannot mention exact metrics since I didn't keep it)
 
I remember that this is because inter process communication is expensive.
 
This recommendation is still valid and should I use storm that way?