Messages in this thread | | | Date | Thu, 2 Nov 2006 09:10:11 +0000 | From | "Daniel J Blueman" <> | Subject | Re: How to optimize system time for such case? |
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FENG ZHOU wrote: > Hello, all > I am optimizing a compiler and I believe there is a bug in such > compile. Currently, I have a test case, which is a scientific > application, has a lot of system time. This is weird, because this > case does not have many system calls. Meanwhile, compiled at another > option, I found all the "system time" are gone! So, I assume there is > some problem in the first one (though both binary produce correct > result). I used some performance tuning tool and found the hottest > address for CPU privilege level change event is: 0xa000000100001a70. > This address is not in code or data segment. Now, I am kinda stuck > here. My question is: how to find what this address is? Or find out > what is the cause of the "system time"? Thanks in advance. > > PS: the platform is Itanium 2. > -Feng
First question is what kernel, second is how much memory?
I recently had this experience (high system time) with some vendor kernels with a system with 16GB of memory and 4-8GB processes. The VM was trying to reclaim pages like crazy, but failing. -- Daniel J Blueman - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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