Hi all, I have an application compiled for the RISC-V ISA running in gem5 SE mode. I want to profile, i.e. get the execution stats, only for a specific kernel / Region of Interest (ROI) inside the code.
I understand the standard way to approach this would be to insert m5_ops that call m5_reset_stats() and m5_dump_stats() but, if I understand correctly, m5_ops support for RISC-V is still unavailable (thread from Dec 2017 <https://gem5-users.gem5.narkive.com/h2DCOtDb/m5ops-with-riscv>). Another way I see is to modify the configuration script by inserting calls to *system.cpu.scheduleInstStop *and scheduling an event triggered at a certain instruction count to reset and dump the stats. However, I cannot figure an easy way to find the exact instruction count where the ROI begins and ends. I wonder if there is another simple way to approach this. Is there some way to access the application's *stdout *from inside the python configuration script? This way I could insert printf("ROI BEGIN\n"); in my code, compile without any external library, and then run in gem5 while monitoring the *stdout* from inside the python script. When that output line is found, the events are triggered. Is there any suggestion on how to gathering stats for ROI only in a RISC-V program, considering the unavailability of m5_ops? Thank you and best regards -- Marcelo Brandalero
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