Date: | Thu, 19 Mar 2009 02:22:37 -0400 |
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From: | Edward Lee <edwl202@xxxxxxxxx> |
Subject: | Re: [Gems-users] Coherence misses |
Let me try to summarize what I am trying to do, maybe I can get a feedback this time. I am running FFT on an 8 processor SMP target using MOSI_SMP_bcast cache coherence protocol. I used the warm caches and loaded Ruby for the main computation only. And my purpose is to somehow measure the overhead of maintaining coherent caches. Accordingly, I would like to isolate different types of cache misses especially the coherence misses. I got the ruby.stats file but I am not sure if I can use this output directly for what I need. I have the total misses as copied from my ruby.stats file like this: Total_misses: 127314 total_misses: 127314 [ 22540 16951 16571 16564 12979 12803 12781 16125 ] user_misses: 96467 [ 13183 12989 12742 12637 11184 11161 11144 11427 ] supervisor_misses: 30847 [ 9357 3962 3829 3927 1795 1642 1637 4698 ] I didn't paste the whole stats as it is quite large but my question is whether there is any information already existing in the ruby-stats file that can isolate different cache misses (global count is fine)? Or should I try to modify the profiler code to get this info? Also, I have the number of misses but I don't see the total number of accesses in that section? So, would it be correct if I use the "Data requests" from "Simics Driver Transaction Stats"? However, the "Request missed" shows 189346 there, bigger than the misses shown above. I would really appreciate any input on this. Regards, Ed On Sun, Mar 15, 2009 at 12:09 AM, Edward Lee <edwl202@xxxxxxxxx> wrote: Hi, |
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