Go through the champsim codebase

amithgopi / CPU-Branch-Prediction-and-Cache-Replacement-using-ML-and-RL

2 stars 1 forks source link

Go through the champsim codebase #4

Open amithgopi opened 2 years ago

amithgopi commented 2 years ago

[ ] Figure out how Champsim works, where the different algorithms are called, and how data is transported through the simulation engine - Ajin
[ ] Does Champsim run instructions out of order, the effect of cores on instruction order?
[ ] Where/What to modify if we need to extract additional parameters?

abbypjoby commented 2 years ago

$ ./config.sh <configuration file>
$ make
$ bin/champsim --warmup_instructions 200000000 --simulation_instructions 500000000 ~/path/to/traces/600.perlbench_s-210B.champsimtrace.xz

These are the 3 steps involved in configuring and then creating the champsim binary for that spec. The config.sh file is basically a python script. So we can use python to run it in an M1 mac. Then the make is trivial.

Once make is executed a champsim binary is created which can be used to run the traces on

abbypjoby commented 2 years ago

In main.cc, line number 424, there is a function called init_instruction. This is the part of the program that actually executes the trace on the OOO processor core. It takes in the trace, decodes the instruction of the trace and updates the data structure called arch_instr.