Hi, I wanted to ask if there is a way to make full-system runs deterministic. I tried running with faketime set at a fixed date and time (to possibly trick any rng seeds) but that doesn't help.
The reason I'm asking is because of the following situation I run into. I have a modified gem5 and when I run the memtest.py config with gem5.opt, I get a write/read mismatch at a certain point. When I rerun with debug flags on, the mismatch doesn't occur (or occurs earlier/later). I also tried the following: Let's say the mismatch is caught at tick 1000 (for demonstrative purposes). If I run... ./build/X86/gem5.opt -re --silent-redirect -d "test" configs/example/memtest.py -f 0 -c 2:1:1:1 -t 2:1:1:1:3 ...or... ./build/X86/gem5.opt -re --silent-redirect -d "test" --debug-flags=CacheAll,MemTest --debug-file=dbg --debug-start=5000 configs/example/memtest.py -f 0 -c 2:1:1:1 -t 2:1:1:1:3 ...I get a mismatch at tick 1000 (before tracing starts in the second case). If I run... ./build/X86/gem5.opt -re --silent-redirect -d "test" --debug-flags=CacheAll,MemTest --debug-file=dbg --debug-start=600 configs/example/memtest.py -f 0 -c 2:1:1:1 -t 2:1:1:1:3 ...I don't get a mismatch at tick 1000 and the simulation continues past that point (and might find a different mismatch afterwards). So is there any way to make a run completely deterministic so these differences don't occur? That way I can run gem5 quickly without tracing until I hit a mismatch, then rerun with tracing enabled right before that point. Thanks a lot for your help. Best, Hossam
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