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gprofÊÇGNU profiler¹¤¾ß£¬´æÔÚÓÚbinutils¹¤¾ß°ü¡£¿ÉÒÔÏÔʾ³ÌÐòÔËÐеēflat profile”£¬°üÀ¨Ã¿¸öº¯ÊýµÄµ÷ÓôÎÊý£¬Ã¿¸öº¯ÊýÏûºÄµÄ´¦ÀíÆ÷ʱ¼ä¡£Ò²¿ÉÒÔÏÔʾ“µ÷ÓÃͼ”£¬°üÀ¨º¯ÊýµÄµ÷ÓùØÏµ£¬Ã¿¸öº¯Êýµ÷Óû¨·ÑÁ˶àÉÙʱ¼ä¡£»¹¿ÉÒÔÏÔʾ“×¢Ê͵ÄÔ´´úÂ딣¬ÊdzÌÐòÔ´´úÂëµÄÒ»¸ö¸´±¾£¬±ê¼ÇÓгÌÐòÖÐÿÐдúÂëµÄÖ´ÐдÎÊý¡£
gprof ʵÏÖÔ­Àí£º
gprof²¢²»ÉñÆæ£¬ÔÚ±àÒëºÍÁ´½Ó³ÌÐòµÄʱ ºò£¨Ê¹Óà -pg ±àÒëºÍÁ´½ÓÑ¡Ï£¬gcc ÔÚÄãÓ¦ÓóÌÐòµÄÿ¸öº¯ÊýÖж¼¼ÓÈëÁËÒ»¸öÃûΪmcount£¨or“_mcount”, or“__mcount”£©µÄº¯Êý£¬Ò²¾ÍÊÇ˵-pg±àÒëµÄÓ¦ÓóÌÐòÀïµÄÿһ¸öº¯Êý¶¼»áµ÷ÓÃmcount, ¶ømcount»áÔÚÄÚ´æÖб£´æÒ»Õź¯Êýµ÷ÓÃͼ£¬²¢Í¨¹ýº¯Êýµ÷ÓöÑÕ»µÄÐÎʽ²éÕÒ×Óº¯ÊýºÍ¸¸º¯ÊýµÄµØÖ·¡£ÕâÕŵ÷ÓÃͼҲ±£´æÁËËùÓÐÓ뺯ÊýÏà¹ØµÄµ÷ÓÃʱ¼ä£¬µ÷ÓôÎÊýµÈµÈµÄËùÓÐÐÅÏ¢¡£
GPROFµÄ»ù±¾Ê¹Ó÷½·¨ÈçÏ£º
1£®Ê¹ÓÃGCC¼ÓÉÏ-pgÑ¡Ïî±àÒë³ÌÐò
2£®Ö´ÐгÌÐò£¬»áÉú³Égmon.out
3£®Ê¹ÓÃgprof·ÖÎögmon.outÎļþ£¬µÃ³öͳ¼Æ×ÊÁÏ
4£®GPROF²»Ö§³Ö¶¯Ì¬Á´½Ó¿âºÍ¶àÏß³Ì
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#include<stdio.h>
void funca()
{
    int i  = 0;
    int n = 0;
    for(i = 0;i < 10000000;i++)
    {
        n++;
        n--;
    }
}
void funcb()
{
    int i  = 0;
    int n = 0;
    for(i = 0;i < 10000000;i++)
    {
        n++;
        n--;
    }
}
int main(int argc,char *argv[])
{
    int i = 0;
    for(i = 0;i < 10;i++)
    {
        funca();
    }
    funcb();
    return 0;
}
±àÒ룺
$ gcc hello.c -pg -o hello
ÔËÐУº
$ ./hello
Éú³Égmon.outÎʼþ
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$ gprof hello gmon.out -p
Flat profile:
Each sample counts as 0.01 seconds.
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2¡¢ÐÞ¸ÄÎļþqt-sdk-linux-x86-opensource-2009.05.binµÄÊôÐÔ£¬ÈÃÆä¿ÉÖ´ÐУº
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