Hi Debra
One of my pet topics. I've answerd you in another thread, attached a presentation. But, if you get the wrong mode setting for the compute node then the impact is that you pay for it by having an impact on performance. Sometimes a small impact, but it can be very big depending on the payload of the message. After you have seen my presentation, please ask away. In the presentation I try to explain how to use the compute mode setting, and I also show examples of what can be the impact if you get it wrong.