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LSAssigner4iEDA

Welcome to LSAssigner4iEDA! Our project aimed at solving the track assignment problem within the iEDA project. We tackle this challenge by modeling it as a 0-1 integer programming problem and integrating the local search solver NuPBO for efficient solutions. Our approach has demonstrated strong performance across three key metrics, showcasing our capability to effectively address complex allocation challenges.

Compilation and Execution

Compilation

To compile the project, run the following commands:

mkdir build
cd build
cmake ..
make -j16

The executable file TA is located in the build/test directory.

Execution

To execute the program, you need to provide the input file as an argument. For example, to run the program with the example input file

# make sure to navigate to the build/test directory before running
./TA ../../test/test.txt \
    -timelimit 60 \
    -sol_time 20 \
    -output_file "home/output.txt" \
    -value_file "home/value.txt" \
    -blockcoef 300 \
    -pincoef 2 \
    -routecoef 1 \
    -distcoef 0.1 \
    -nthreads 128 \
    -solve_option 1 \
    -testall 2

Replace ../../test/test.txt with your actual input file name.

The output file will be named output.txt and will contain the solution of the problem.

Input and Output

The input and output files both record the track allocation information on the panel. The format is as follows:

panel [layer_id] [panel_id] [lb_x] [lb_y] [rt_x] [rt_y] [prefer_direction]
{
    track_list
    [axis] [start] [step_length] [end]
    wire_list
    [net_id] [lb_x] [lb_y] [rt_x] [rt_y]
    soft_shape_list
    [net_id] [lb_x] [lb_y] [rt_x] [rt_y]
    hard_shape_list
    [net_id] [lb_x] [lb_y] [rt_x] [rt_y]
}

Metrics

We use the following metrics to evaluate the performance of a Solver.

  1. Total costs of wire overlaps: The total cost of wire overlaps is the sum of the costs of all wires that overlap with each other.
  2. Total costs of wire-pin overlaps: The total cost of wire-pin overlaps is the sum of the costs of all wires that overlap with each pin.
  3. Total costs of wire-block overlaps: The total cost of wire-block overlaps is the sum of the costs of all wires that overlap with each block.
  4. Total costs: The total cost is the sum of the costs of all wires, pins, and blocks.

Example

We provide two example input files from the iSPD 2018 track assignment challenge. We compare the performance of LSAssigner with the original iEDA algorithm on these two examples. The results are shown in the following table:

ispd18_test1 ispd18_test3
The number of panels 384 1829
LSAssigner
Total costs of wire overlaps 9 189
Total costs of wire-pin overlaps 68 955
Total costs of wire-block overlaps 0 5
Total costs 77 1149
Original iEDA
Total costs of wire overlaps 0 3
Total costs of wire-pin overlaps 198 1941
Total costs of wire-block overlaps 15367 177897
Total costs 15565 179841