[Gems-users] How to record the synchronization cycles?

[胡杏 <huxing@xxxxxxxxx>]

Hello,

I am simulating splash2 benchmarks, and I want to record the cycles 
when the cores stall because of synchronization(such as barriers, locks 
and pauses). How to do this?  It's said that magic instructions have to 
be used. Could you please tell me the implementation details about it ? 
Thanks a lot.