Lichee Pi 4A

Dhrystone

性能评测 系统：revyos 更新：2026-04-03

RuyiSDK 性能评测示例

环境说明

  • 硬件环境：Licheepi 4A 开发板（th1520）
  • 软件环境：Debian/openEuler for RISC-V

一、Ruyi环境搭建

更新 Ruyi 索引并安装工具链

ruyi update
ruyi install gnu-plct-xthead

正常情况下，终端会看到如下输出：

debian@revos-lpi4a:~$ ruyi install gnu-plct-xthead
info: skipping already installed package gnu-plct-xthead-3.1.0-ruyi.20250526

创建并激活 Ruyi 虚拟环境

# 创建虚拟环境，命名为 dhrystone-venv，使用 sipeed-lpi4a profile
ruyi venv -t gnu-plct-xthead sipeed-lpi4a dhrystone-venv
 
# 进入虚拟环境目录
cd dhrystone-venv
 
# 激活虚拟环境
source ./bin/ruyi-activate

正常情况下，终端会看到如下输出：

debian@revos-lpi4a:~$ ruyi venv -t gnu-plct-xthead sipeed-lpi4a dhrystone-venv
info: Creating a Ruyi virtual environment at dhrystone-venv...
info: The virtual environment is now created.
 
You may activate it by sourcing the appropriate activation script in the bin directory, and deactivate by invoking `ruyi-deactivate`.
 
A fresh sysroot/prefix is also provisioned in the virtual environment.
It is available at the following path:
  /home/debian/dhrystone-venv/sysroot
 
The virtual environment also comes with ready-made CMake toolchain file and Meson cross file. Check the virtual environment root for those; comments in the files contain usage instructions.
 
debian@revos-lpi4a:~$ cd dhrystone-venv
debian@revos-lpi4a:~/dhrystone-venv$ source ./bin/ruyi-activate
«Ruyi dhrystone-venv» debian@revos-lpi4a:~/dhrystone-venv$ riscv64-plctxthead-linux-gcc --version
riscv64-plctxthead-linux-gcc (RuyiSDK 20250526 Xuantie-Sources Xuantie-binutils-8ee62aac8606 Xuantie-gcc-c2e0bcc86d1f Xuantie-glibc-29dd660835c5) 14.1.1 20240710
Copyright (C) 2024 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

验证GCC版本

riscv64-plctxthead-linux-gnu-gcc --version
make --version

二、获取 Dhrystone 源码并编译

克隆 Dhrystone 源码

# 创建工作目录（在虚拟环境内）
mkdir -p ~/projects/dhrystone && cd ~/projects/dhrystone
 
# 克隆仓库
git clone https://github.com/Keith-S-Thompson/dhrystone.git
cd dhrystone

正常情况下，终端会看到如下输出：

«Ruyi dhrystone-venv» debian@revyos-lpi4a:~/dhrystone-venv$ mkdir -p ~/projects/dhrystone && cd ~/projects/dhrystone
«Ruyi dhrystone-venv» debian@revyos-lpi4a:~/projects/dhrystone$ git clone https://github.com/Keith-S-Thompson/dhrystone.git
Cloning into 'dhrystone'...
remote: Enumerating objects: 79, done.
remote: Counting objects: 100% (20/20), done.
remote: Compressing objects: 100% (10/10), done.
remote: Total 79 (delta 14), reused 10 (delta 10), pack-reused 59 (from 1)
Receiving objects: 100% (79/79), 217.86 KiB | 177.00 KiB/s, done.
Resolving deltas: 100% (29/29), done.
«Ruyi dhrystone-venv» debian@revyos-lpi4a:~/projects/dhrystone$ cd dhrystone
«Ruyi dhrystone-venv» debian@revyos-lpi4a:~/projects/dhrystone/dhrystone$

使用 nano 添加缺失的头文件

#进入最常用的 v2.1 目录
cd v2.1
 
#用 nano 打开 dhry_1.c
nano dhry_1.c

使用键盘方向键将光标移动到 #include "dhry.h" 这一行的下方（通常是第 18 行或第 19 行附近）。然后在新的一行中依次输入以下内容：

#include <stdlib.h>

按下 Ctrl+O 保存文件（按回车确认文件名），然后按 Ctrl+X 退出 nano。

删除冲突的旧式函数声明

继续使用 nano 编辑 dhry_1.c（或使用 sed 快速删除）。找到包含 extern char *malloc 和 extern int times 的行，将它们删除或注释掉。也可以使用以下 sed 命令自动删除：

sed -i '/extern char.*malloc/d' dhry_1.c
sed -i '/extern  int.*times/d' dhry_1.c

image-20260316130902340

修正重复包含头文件的问题

如果 dhry_1.c 中重复包含了 #include "dhry.h"（例如第 18 行和第 19 行都是该包含），需删除一行。可用以下命令查看文件开头：

cat -n dhry_1.c | head -20

若发现重复，再次使用 nano 打开文件，删除多余的那一行，保存退出。

调整循环次数

默认循环次数为 50000，在 TH1520 上运行时间过短，会导致计时为零。建议修改为 500000 以获得数秒的运行时间。用 nano 打开 dhry_1.c，找到 #define Number_Of_Runs 50000，将其改为：

#define Number_Of_Runs 500000

按下 Ctrl+O 保存文件（按回车确认文件名），然后按 Ctrl+X 退出 nano。

image-20260316131320374

编译

riscv64-plctxthead-linux-gnu-gcc -std=gnu90 -O2 -DNOENUM -DTIMES -DHZ=100 -o dhrystone dhry_1.c dhry_2.c -lm

正常情况下，终端会看到如下输出：

«Ruyi dhrystone-venv» debian@revos-lpi4a:~projects/dhrystone/dhrystone/v2.1$ nano dhry_1.c
«Ruyi dhrystone-venv» debian@revos-lpi4a:~projects/dhrystone/dhrystone/v2.1$ riscv64-unknown-linux-gnu-gcc -std=gnu99 -O2 -DNOENUM -DTIMES -DHZ=100 -o dhrystone dhry_1.c dhry_2.c -lm
dhry_1.c: In function ‘main’:
dhry_1.c:97:3: warning: incompatible implicit declaration of built-in function ‘strcpy’ [-Wbuiltin-declaration-mismatch]
  97 |    strcpy (Ptr_Glob->variant.var_1.Str_Comp,
     |    ^~~~~~
dhry_1.c:20:1: note: include ‘<string.h>’ or provide a declaration of ‘strcpy’
   19 | #include <stdlib.h>
+++ | +#include <string.h>
   20 | 
dhry_1.c:223:40: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  223 |    printf ("  Ptr_Comp:       %d\n", (int) Ptr_Glob->Ptr_Comp);
      |                                        ^
dhry_1.c:234:40: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  234 |    printf ("  Ptr_Comp:       %d\n", (int) Next_Ptr_Glob->Ptr_Comp);
      |                                        ^
«Ruyi dhrystone-venv» debian@revos-lpi4a:~projects/dhrystone/dhrystone/v2.1$ ./dhrystone
Dhrystone Benchmark, Version 2.1 (Language: C)
 
Program compiled without 'register' attribute
 
Please give the number of runs through the benchmark: 10000000
 
Execution starts, 10000000 runs through Dhrystone
Execution ends
 
Final values of the variables used in the benchmark:
 
Int_Glob:            5

三、运行 Dhrystone 基准测试

./dhrystone

程序启动后，会提示输入运行的循环次数：

Please give the number of runs through the benchmark:

输入一个较大的数字（例如 10000000）并按回车，让测试运行足够长的时间以获得稳定结果。 为了方便自动化测试，也可以使用管道输入：

echo 10000000 | ./dhrystone

正常情况下，终端会看到如下输出：

A«Ruyi dhrystone-venvA» debian@RevOS:~projects/dhrystone/dhrystone/v2.1$ ./dhrystone.c
 
Dhrystone Benchmark, Version 2.1 (Language: C)
Program compiled without 'register' attribute
 
Please give the number of runs for the benchmark: 10000000
 
Execution starts: 10,000,000 iterations of Dhrystone
Execution ends.
 
Final benchmark values:
Int_Glob: 5
  should be: 5
Bool_Glob: 1
  should be: 1
Ch_1_Glob: A
  should be: A
Ch_2_Glob: B
  should be: B
Arr_1_Glob[8]: 7
  should be: 7
Arr_2_Glob[8][7]: 10000010
  should be: Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp: 90784
    should be: (implementation-dependent)
  Discr: 0
    should be: 0
  Enum_Comp: 2
    should be: 2
  Int_Comp: 17
    should be: 17
  Str_Comp: DHRYSTONE PROGRAM, SOME STRING
    should be: DHRYSTONE PROGRAM, SOME STRING
Next_Ptr_Glob->
  Ptr_Comp: 90784
    should be: (implementation-dependent), same as above
  Discr: 0
    should be: 0
  Enum_Comp: 1
    should be: 1
  Int_Comp: 18

四、返回上级目录并退出 Ruyi 虚拟环境

# 返回上级目录
cd ..
 
# 退出 Ruyi 虚拟环境
ruyi-deactivate

正常情况下，终端会看到类似如下输出：

A«Ruyi dhrystone-venvA» debian@revos-lpi4a:~/projects/dhrystone/dhrystone/v2.1$ cd ..
A«Ruyi dhrystone-venvA» debian@revos-lpi4a:~/projects/dhrystone/dhrystone$ ruyi-deactivate
debian@revos-lpi4a:~/projects/dhrystone/dhrystone$