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memroy bandwidth and LLC hit rate

Akiko_Matsumoto
Beginner
128 Views
Hello,

I would like to measure memory bandwidth and LLC hit rate on X7500 processor. "How do I Mesure Memory Bandwidth on an Intel Corei7 or Xeon 5500 Series Platform Using Intel Vtune Performance Analyzer?" is very usefull. So, I have two questions.

1) X7500 doesn't have "UNC_IMC_WRITES.FULL.ANY" or "UNC_IMC_NORMAL_READS.any" either.
Which events should I use insted of them?
2) Could you recommend some documents for measurement of cache hit rate on X7500 processors?

best regards,
Akiko MATSUMOTO
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2 Replies
Peter_W_Intel
Employee
128 Views
I have no boxwhich containsX7500 processor to verify, so no idea for Q1

For Q2, measuring LLC hit rate for Intel Core i7 processors I suggest to use:

LLC hit rate = (MEM_LOAD_RETIRED.LLC_UNSHARED_HIT * 35) / (CPU_CLK_UNHALTED.THREAD * 100)

There is a helper file named pmm.chm under "VTune/Help" directoryto know all events for i7 processors.

Also you can read this article about using VTune Performance Analyzer to optimize software on Intel Core i7 processors, to know more.

Regards, Peter
Akiko_Matsumoto
Beginner
128 Views
Hello Peter-san.

Thank you for your reply.
The value of 35 means the access latency bringing data from memory. Is that correct?

best regards,
Akiko MATSUMOTO
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