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。
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