{"id":76,"date":"2012-04-24T05:07:24","date_gmt":"2012-04-24T05:07:24","guid":{"rendered":"http:\/\/finaldie.com\/wordpress\/?p=76"},"modified":"2013-01-27T08:24:34","modified_gmt":"2013-01-27T08:24:34","slug":"profile-with-oprofile","status":"publish","type":"post","link":"https:\/\/finaldie.com\/blog\/profile-with-oprofile\/","title":{"rendered":"Profile with oprofile"},"content":{"rendered":"

SUMMARY<\/h1>\n

After my previous article of how to profile a program with gprof, I think many guys has recognize the importance of profile.\u00a0Today the new blog for introducing how to profile a program with oprofile<\/a><\/strong>.<\/p>\n

Why oprofile<\/h1>\n

Many guys may asked why oprofile? There is gprof we can use. Ok, cool down, I’ll take a little time to explain why do this. As we know, gprof has some\u00a0defects, which can not profile a program in the some scenes(See detail<\/a>). So, in a given scene, when a daemon program and you has no\u00a0permission to\u00a0re-compile it. So, what would you do this? The answer is that gprof cannot do this. Because without re-compile it with “-pg”, the program cannot generate a “gmon.out” result file. And another reason is that your program will run very slowly, since you re-compile with “-pg”, you may cannot find the correct hot point. So, you need a tool, which can do profile at runtime and run as fast as possible, for lucky, oprofile can do it.<\/p>\n

How to<\/h1>\n

Let’s go forward to doing it as fast as we can, I think most of guys hate reading a long article, especially the\u00a0redundancy one. Ok, drop it, free your mind and follow me to take a look at what we have to.<\/p>\n

Work flow<\/h2>\n