LARF is a tool for time-division-multiplexing (TDM) optimization in multi-FPGA systems. Given the timing graph and the routing resources between FPGAs, it will generate the TDM ratio for each inter-FPGA signal such that the system clock period (the maximum arrival time of the sinks of the timing graph). More details may refer to the following papers,
- Chak-Wa Pui and Evangeline F. Y. Young, 'Lagrangian Relaxation-Based Time-Division Multiplexing Optimization for Multi-FPGA Systems', accepted by ACM Transactions on Design Automation of Electronic Systems (TODAES)
- Chak-Wa Pui and Evangeline F. Y. Young, 'Lagrangian Relaxation-Based Time-Division Multiplexing Optimization for Multi-FPGA Systems', IEEE/ACM International Conference on Computer-Aided Design (ICCAD), Westminster, CO, USA, Nov. 4-7, 2019.
(LARF supports ISPD'16 benchmarks. This version of code is consistent with the one accpected by TODAES.)
Step 1: Download the source code. For example,
$ git clone https://github.com/cuhk-eda/larfStep 2: Go to the project root and build by
$ cd larf/src
$ makeNote that this will generate a folder bin under the root, which contains binaries and auxiliary files.
More details are in Makefile.
- GCC (version >= 4.8.0) or other working c++ compliers
- Boost (version >= 1.58)
- Python (version 3, optional, for utility scripts)
Go to the bin directory and run the binary larf with a toy case ispd16_f01:
$ cd bin
$ mkdir f01
$ ../larf -aux ../../toys/ispd2016/FPGA01/design.aux -flow tdm_part -partition 5
$ ../larf -aux 0/design.aux -out FPGA01_0.pl -flow tdm_place
$ ../larf -aux 1/design.aux -out FPGA01_1.pl -flow tdm_place
$ ../larf -aux 2/design.aux -out FPGA01_2.pl -flow tdm_place
$ ../larf -aux 3/design.aux -out FPGA01_3.pl -flow tdm_place
$ ../larf -aux 4/design.aux -out FPGA01_4.pl -flow tdm_place
$ ../larf -aux ../../toys/ispd2016/FPGA01/design.aux -flow tdm_time -out f01.tdm -partition 5Instead of running the binary directly, you may also use a wrapping script run.sh to save typing and do more:
$ export BENCHMARK_PATH=$(pwd)/toys
$ cd bin
$ ./run.sh tdm_part f01 5
$ ./run.sh tdm_place f01 5
$ ./run.sh tdm_time f01 5More usage may refer to scripts/run.sh and src/main.cpp.
The benchmarks can be downloaded from ISPD'16.
You may let run.sh know the benchmark path by setting OS environmental variable BENCHMARK_PATH.
Then,
$ cd bin
$ ./run.sh tdm_part <benchmark_name...|all> <#partitions> [option...]
$ ./run.sh tdm_place <benchmark_name...|all> <#partitions> [option...]
$ ./run.sh tdm_time <benchmark_name...|all> <#partitions> [option...]scripts: utility python/bash scriptssrc: C++ source codealg: external algorithm packagesdb: databasegp: global placementtdm: time-division-multiplexing optimizationutils: utilities
toys: toy test cases
Experiments are performed on a 64-bit Linux workstation with Intel Xeon Silver 4114 CPU (2.20GHz, 40 cores) and 256GB memory, where eight threads are used.
| Design | System Clock Period (ps) | Runtime (sec) |
|---|---|---|
| FPGA01 | 174 | 31 |
| FPGA02 | 415 | 38 |
| FPGA03 | 863 | 151 |
| FPGA04 | 3153 | 190 |
| FPGA05 | 8325 | 192 |
| FPGA06 | 1151 | 324 |
| FPGA07 | 2960 | 358 |
| FPGA08 | 4214 | 162 |
| FPGA09 | 4695 | 358 |
| FPGA10 | 1066 | 257 |
| FPGA11 | 7268 | 262 |
| FPGA12 | 1288 | 520 |
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