Hi Hossam,
From what I understand you modified the memtest.py to run full-system.
Which CPU models are you using to boot the OS? KVM CPU models are not
deterministic. If you still want to bypass your cache system to avoid
longer booting times you can use the non-caching simple CPU model
(deterministic).
Best,
Luis
Le 27/09/2024 à 01:04, Hossam ElAtali via gem5-users a écrit :
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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