ChampSim is a trace-based simulator for a microarchitecture study. You can sign up to the public mailing list by sending an empty mail to [email protected]. If you have questions about how to use ChampSim, you can often receive a quicker response on the mailing list. Please reserve GitHub Issues for bugs.

git clone https://github.com/ChampSim/ChampSim.git

The objective of this project is to understand cache misses and propose a solution to reduce conflict misses, thereby improving hit rate, AMAT, IPC, and performance.

Given a fixed configuration of last level cache, the goal is to find a suitable remapping of addresses to cache lines to reduce conflict misses. A reduction in conflict misses will improve hit rate, AMAT, IPC, and performance.

One proposed solution involves creating an intermediate data structure to remap addresses to new indices. For example, a two-dimensional array can be used to represent a remap table.

Example remap table for a 4 ways 8 set cache:

╔═══╦═══╦═══╦═══╦═══╗
║ 0 ║ 0 ║ 0 ║ 0 ║ 0 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 1 ║ 1 ║ 1 ║ 1 ║ 6 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 2 ║ 2 ║ 2 ║ 2 ║ 2 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 3 ║ 3 ║ 3 ║ 3 ║ 3 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 4 ║ 4 ║ 4 ║ 4 ║ 4 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 5 ║ 5 ║ 5 ║ 5 ║ 5 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 6 ║ 6 ║ 1 ║ 1 ║ 6 ║
╠═══╬═══╬═══╬═══╬═══╣
║ 7 ║ 7 ║ 7 ║ 7 ║ 7 ║
╚═══╩═══╩═══╩═══╩═══╝

Sets are classified as Very Hot, Hot, Very Cold, and Cold based on access and eviction counts.

• Novel remapping approach.
• Performance monitored by IPC values.
• Overhead measured by Average number of tag comparisons for one memory search.

• Using Buffer you can reduce the cold misses too

• Here , We have Some Potential sets that Need to be checked while remapping

• Traces Download Link
• Traces must be used in compressed format only.

Instructions for using the Champsim Simulator are provided.

• Champsim Download Link

To use the Champsim Simulator, follow these steps:

1. Create a New Folder: Create a new folder named dpc3_traces and place the downloaded trace files in it.

2. Grant Permissions: Grant permissions for both build_champsim.sh and run_champsim.sh scripts. Use the following commands:

   chmod +x build_champsim.sh
   chmod +x run_champsim.sh
   

3. Building: To build the simulator, use the following command:

    ./build_champsim.sh bimodal no no no no lru 1
   

4. Running: To run the simulator, use the following command:

     ./run_champsim.sh bimodal-no-no-no-no-lru-1core 1 10 gcc_13B.trace.xz
   

Note: Replace bimodal-no-no-no-no-lru-1core, 1, and 10 with the desired parameters. gcc_13B.trace.xz is an example trace file.