Hi all,
I am running SMT programs for the first time, and I encountered the
following issues:
1. In function removeThread() in cpu.cc, when a thread is removed, some
physical registers allocated for this thread are freed from the rename map.
However, a subset of these registers have actually been freed previously
from the history buffer in rename stage. This make them to be freed twice,
causing threads that are still executing to crash. I tried to fix this by
not allowing registers to be added into the freelist more than one time. The
simulator works for some workload combinations after this.
2. For some other combinations, the simulator crashed at line 701 in cpu.cc:
assert(iew.ldstQueue.getCount(tid) == 0);
This means that there are still outstanding memory instructions in the LSQ.
I added the following code just before the above line:
iew.ldstQueue.squash(squash_seq_num, tid);
And the simulator is working for those workloads.
3. In se.py, when checking for SMT workload, the way smt_process.cmd is set
seemed not working, since it was a string. I changed them similarly to line
39 in that file, and it is working now.
Currently I the simulator is working for my SMT programs. However, I am
wondering whether what I have done are correct, and there are things that
may affect the simulator but I did not see now. Is anyone there working with
SMT programs? Any ideas are appreciated.
I am running O3CPU in SE mode using M5 2.0b4.
Thanks,
--Nam
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