详解C调用lua脚本效率测试
详解C调用lua脚本效率测试
C调用lua脚本效率测试是本文要介绍的内容，以下代码以C语言为基准，测试了C调用Lua循环和循环调用Lua的效率。结论是不要频繁地穿越C/Lua边界.
#include <time.h>
extern "C"
{
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}/* Lua解释器指针 */
const char LUA_SCRIPT[] =
"function loop_add(a, b) "
" local sum = 0 "
" for i = 1, 10000000 do "
" sumsum = sum + a + b "
" end "
" return sum "
"end "
" "
"function add(a, b) "
" return a + b "
"end "
;
// lua 脚本里面的函数由C调用
int use_lua_add(lua_State *L, const char *func_name, int x, int y)
{
int sum; /* 通过名字得到Lua函数 */
lua_getglobal(L, func_name); /* 第一个参数 */
lua_pushnumber(L, x); /* 第二个参数 */
lua_pushnumber(L, y); /* 调用函数，告知有两个参数，一个返回值 */
lua_call(L, 2, 1); /* 得到结果 */
sum = (int)lua_tointeger(L, -1);
lua_pop(L, 1);
return sum;
}
int main()
{
int i, sum = 0;
clock_t tStart, tStop;
lua_State *L = lua_open(); /* opens Lua */
luaL_openlibs(L);
if (luaL_dostring(L, LUA_SCRIPT)) // Run lua script
{
printf("run script failed/n");
lua_close(L);
return -1;
}
sum = 0;
tStart = clock();
for (i = 0; i < 10000000; i++)
{
sum += 1 + 1;
}
tStop = clock();
printf("C++: %dms./nThe sum is %u./n",
(tStop - tStart) * 1000 / CLOCKS_PER_SEC, sum);
sum = 0;
tStart = clock();
sum = use_lua_add(L, "loop_add", 1, 1);
tStop = clock();
printf("Lua loop_add: %dms./nThe sum is %u./n",
(tStop - tStart) * 1000 / CLOCKS_PER_SEC, sum);
sum = 0;
tStart = clock();
for (i = 0; i < 10000000; i++)
{
sum += use_lua_add(L, "add", 1, 1);
}
tStop = clock();
printf("Loop lua add: %dms./nThe sum is %u./n",
(tStop - tStart) * 1000 / CLOCKS_PER_SEC, sum);
lua_close(L);
return 0;
} 运行结果：
C++: 31ms.
The sum is 20000000.
Lua loop_add: 437ms.
The sum is 20000000.
Loop lua add: 2360ms.
The sum is 20000000. 小结：详解C调用lua脚本效率测试的内容介绍完了，希望通过本文的学习能对你有所帮助！
想看看c调用lua和lua调用c效率有多大差别吗？
加一种测试：
"function loop_cadd(a, b) " " local sum = 0 " " for i = 1, 10000000 do " " sum = sum + csum(a,b) " " end " " return sum " "end "
其中csum是一个c函数 int csum(lua_State* l) { int a = lua_tointeger(l,1) ; int b = lua_tointeger(l,2) ; lua_pushinteger(l,a+b) ; return 1 ; }
测试结果如下：
C++: 21ms. The sum is 20000000. Lua loop_add: 640ms. The sum is 20000000. Lua loop_cadd: 3027ms. The sum is 20000000. Loop lua add: 3927ms. The sum is 20000000.
结论是从lua调用c函数要比c调用lua函数快一点点。