Cannot get the same results in each run

[Zhe Zhou]

Thank you for providing the useful framework.
I am doing some follow-up research based on your code. However, an annoying thing is that when I run the same simulation command twice, I will get slightly different IPC numbers. This can be observed in each line of IPC log.

I guess there may be some issues about the random seed usage, however I have not found any clues (I have checked that the champsim_seeds are the same in two runs). Do you have any suggestions?

Thank you!

[Zhe Zhou]

I got it. It is due to the srand() function in the LLC replacement module:

Pythia/replacement/drrip.llc_repl

Line 27 in 778e2fc

 srand(time(NULL)); 

[Rahul Bera]

Hi @PKUZHOU, I have pushed the necessary changes to the DRRIP and SHiP replacement policy initialization. This should fix the run-to-run variations. Please let me know if you have found any other source of randomness in the code. We can reopen this issue again.

[Zhe Zhou]

Thank you for your reply!
Yes, after changing the two lines Ican get the same results now.