gem5-nvmain-hybrid-simulator

    (1) environment requirement

(2) compile gem5 with nvmain (patch file can be found in gem5-stable/final_patch/nvmain-classic-gem5-9850)

patch gem5 with nvmain patch file : patch -p1 < final_patch/nvmain-classic-gem5-9850
compile with scons : scons EXTRAS=nvmain-path -jn (n represents compiling threads num)
```
  (3) run system with nvmain memory
```
you can refer to example in directory rapp-test/gcc:--mem-type=nvmain --nvmain-config=nvmain-config-file-path

（1）Architecture and Principle of Cache Optimization in DRAM-PCM hybrid memory

adjust cache replacement policy according to cache miss penalty in DRAM-PCM hybrid memory system , for example: evict data block in LLC cache which fetched from PCM is expensive than data block fetched from DRAM . When evicting cache block from LLC cache , evict data block from DRAM first;
recalculate cache replacement priority according to penalty of cache miss in memory system and reuse probability of cache block;
```
  （2）related source code
```
gem5-stable/src/mem/cache/tags/

Rank-Based-Page-Placement Module in hybrid simulator implemented by multi-level-queue

    （1）Principle of Rank-Based-Page-Placement Strategy

classfy memory pages into hot-pages and cold-pages according to access time;
page access information is managed by multi-level-queue;
```
  （2）related source code
```
nvmain/Utils/MultiQueMigrator/
Decoders/Migrator/
configuration file example: Config/Hybrid_example.config
simple example scripts running CPU SPEC2006 benchmarks are placed in directory: gem5-stable/rapp-test

ShuyRoy/gem5-nvmain-hybrid-simulator