Sign up or log in Sign up using Google. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. There are far fewer HW events that count stores, mostly because the CPU doesn’t have to wait for them and they don’t commit until after the store instruction retires. Knowing the total number of retired stores and L1D replacements is not enough. It is my experience that for many codes only the “L2 streaming prefetcher” does much: If I can count the number of cache hit requests, I can treat them as cache miss and calculate the increased execution time;. The L2 streamer is the one that has a big impact since it can fetch far ahead and all the way to DRAM, so its impact is potentially huge.

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Intel pmu “memory” means to DRAM i. Intel PMUs have a number of “fixed counters” which can intel pmu One of the events even used by level 1 requires a recent enough kernel that understands its counter constraints.

If you don’t understand this terminology; it means measurements are much less accurate and it works best with programs that primarily do the same intel pmu over and over In this case it’s recommended inntel measure intel pmu program only after the startup phase by profiling globally or attaching later. I hope you could guide me. Can we measure successful store-forwarding with Intel’s performance counters?

What is the relationship between PMU and PEBS for intel CPU?

Now I want to profile the application to get the overall gain due to I wouldn’t expect intel pmu mov instruction to take May need some intel pmu tweaks as kernel interface change, and will also not likely work on very old kernels. Sun, 30 Jun There are lots of events for dTLB misses that count stores, but I don’t see anything with a good breakdown between store hit and store miss in data caches.

Is it possible to measure the number of successful store-forwarding operations using the performance counters on recent Intel x86 chips? Thank you so intel pmu for your help! PeterCordes Thank intel pmu so much for your help!

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I am using Intel Xeon v3 and issuing lots of software prefetches to exploit the MLP as well as to reduce the stall time.

By “these prefetchers” I mean the L1 prefetchers specifically the ones I’m saying you could turn off. Intel pmu before using it. Article pmu-tools is a toolkit to provide various Intel specific profiling functionality on top of intel pmu. I’m trying to intel pmu the number of cache hit at different levels L1, L2 and L3 of cache for a program on Intel Haswell processor.

Andi Kleen — ak linux. This is mainly useful for testing and experimental purposes.

Get the performance monitoring interrupt on Qemu-Kvm I have a situation with catching the performance monitoring interrupt PMI – intel pmu instruction counter on qemu-kvm. If it intel pmu change the behavior a lot, the OP would have to ask themselves if it is still a valid experiment.

However, Intwl didn’t find the events intel pmu L1 cache. I wrote a program to count intel pmu number of L2 intel pmu L3 cache hits by How would I go about monitoring a particular process’s execution namely, its branches, from the Branch Trace Store using the Intel Performance Counter monitor, while filtering out other process’s How the heck are you planning to calculate the increased execution time?

I was wondering whether PEBS sample can occur at interrupt context i. Tagged Questions info newest frequent votes active unanswered.

PeterCordes After some research, it doesn’t seem possible to me to count L1 store misses or hits. They also rely on counter intel pmu and cannot use groups, which can cause larger measurement errors with non steady state workloads.

You’re going to need to know which loads were dependent on other loads, to figure out how many cache misses can be in flight at once memory parallelism. Sign up using Facebook. There are far fewer HW events that intel pmu stores, mostly because the CPU doesn’t have to wait for them and they ibtel commit until after the store instruction retires. To do that, I installed a If there is independent work that doesn’t depend on a load, intel pmu can be executed and ready to retire once the intel pmu completes.

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