Hi Fangjia, The crash might be due to the ELFie trying to access pages that are not recorded because the ELFie execution is unconstrained. Therefore, we need to know where to end the simulation to avoid a possible crash.
The PC count pairs are the markers for the gem5 simulator to know where the right ROI starts and ends for the ELFie execution. I believe ELFie can generate information about the starting and ending PC count pair for simulation(https://github.com/intel/pinball2elf#example-of-account-in-warmup simulation-specification <https://github.com/intel/pinball2elf#example-of-pccount-in-warmupsimulation-specification>). With the SIMPOINT_BEGIN events, the simulation will exit into the Python script and allow us to specify what to do for the events. In this case, we can start at the right beginning and exit the simulation at the right ending of the ROI. Best, Zhantong
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