About the Inconsistency Between Dhrystone Benchmark Scores in the IDE and NSDK 0.5.0 Command-Line Scores¶

Problem Description¶

In version 0.5.0 of sdk-nuclei_sdk, the -msave-restore option is enabled by default so that some programs can compile without errors when using the libncrt library in the IDE. However, when creating a Dhrystone example project with the newlib library selected, this option causes the benchmark score to drop, and the result does not reflect the CPU's true performance.

Solution¶

When running the benchmark, you need to go to the corresponding project's Properties -> C/C++ Build -> Settings and deselect Small prologue/epilogue(-msave-restore). The detailed steps and screenshots are as follows:

1. Download the sdk-nuclei_sdk 0.5.0 NPK component package.

2. Create a new Nuclei RISC-V C/C++ project.

3. During project creation, select Dhrystone Benchmark and N307FD Core, and keep the default settings for the other options. If you build and run it directly at this point, the benchmark score is 1.405.

4. However, for actual benchmarking, you must first deselect the -msave-restore option; the resulting benchmark score is 1.664.