共计 960 个字符，预计需要花费 3 分钟才能阅读完成。
1、cflow
cflow 程序打印出一个函数调用树，显示函数之间的调用关系。
[root@localhost writelog]# cflow -b writelog.c
main() <int main (int argc, char *argv[]) at writelog.c:72>:
openFile() <FILE *openFile (const char *fileName, const char *mode) at writelog.c:30>:
fopen()
writeFile() <int writeFile (FILE *fp, const char *str, int bLog) at writelog.c:44>:
assert()
getTime() <int getTime (char *out, int fmt) at writelog.c:11>:
time()
localtime()
sprintf()
fprintf()
fflush()
closeFile() <int closeFile (FILE *fp) at writelog.c:66>:
fclose()
2、gprof
gprof 用来查找程序的性能。
#gcc -pg -o writelog writelog.c
Each sample counts as 0.01 seconds.
no time accumulated
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 1 0.00 0.00 closeFile
0.00 0.00 0.00 1 0.00 0.00 getTime
0.00 0.00 0.00 1 0.00 0.00 openFile
0.00 0.00 0.00 1 0.00 0.00 writeFile
3、valgrind
# valgrind --tool=memcheck --leak-check=yes --show-reachable=yes ./test
内存检测工具
