Multi threading issue with region render

[sampad01]

Hi,
I am having a strange issue with region render..the one we do using q hotkey drag in the viewports.
Its showing only one bucket. I have core i7 cpu so it should show 8 buckets. It does show 8 buckets when rendering production but not in region.
This is very awkward. Is there a setting I need to adjust?
I am talking about Softimage 2014 sp2 btw. Please tell me if there is a setting somewhere in softimage to tell it to use all cores. I know there is a setting like this in Maya somewhere.
Not sure where, i haven't use d maya in years.
Thanks in advance for everyone who will answer. Kind regards.

Sampad
http://cgdesk.net