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Home→Tags analysis technique

Tag Archives: analysis technique

openssl – AMD vs Intel

Performance analysis, tools and experiments Posted on 2018-06-24 by mev2018-06-24

The openssl Phoronix benchmark is interesting because the IPC on Intel Haswell system (1.66) is considerably higher than the IPC on AMD Ryzen (1.12). In this post, I’ll explore to look for causes.

Continue reading →
Posted in analysis, featured | Tagged analysis technique | Leave a reply

topdown equivalent metrics for AMD Zen?

Performance analysis, tools and experiments Posted on 2018-06-08 by mev2018-06-11

Intel processors provide a useful set of performance counters for doing topdown analysis, particularly at the first topdown level. This first level asks questions in the following hierarchy: Is a Uop dispatched? If yes, is it retired? If yes –> … Continue reading →

Posted in analysis | Tagged analysis technique, performance counters, top-down | Leave a reply

Investigating Intel performance counters for backend memory costing…

Performance analysis, tools and experiments Posted on 2018-04-25 by mev2018-04-25

I’ve implemented the first level for topdown performance counter analysis and also done an initial analysis of ~15 workloads from recent Phoronix article. A logical next step is to expand the “backend bound” category to first separate CPU-bound vs. memory-bound … Continue reading →

Posted in analysis | Tagged analysis technique, memory, metrics, perf, performance counters | Leave a reply

Off CPU analysis, getrusage, wait4 and related techniques…

Performance analysis, tools and experiments Posted on 2018-04-22 by mev2018-04-23

As I looked to analyze x264, I saw that the On CPU metric was considerably less than other benchmarks like openssl or c-ray that are On CPU almost 100% of the time. I also noticed that my Ryzen 1700 box … Continue reading →

Posted in experiments | Tagged analysis technique, metrics, rusage | 1 Reply

Top down performance counter analysis (part 2) – wspy

Performance analysis, tools and experiments Posted on 2018-04-16 by mev2018-04-17

As described in top down performance counter analysis part 1, top down analysis is an approach that uses key performance counters to characterize an application and then successively drills down with further refinement. On Intel x86 processors, this first level … Continue reading →

Posted in tools | Tagged analysis technique, performance counters, top-down | Leave a reply

Top down performance counter analysis (part 1) – likwid & perf

Performance analysis, tools and experiments Posted on 2018-04-14 by mev2018-04-16

In this posting I summarize top-down performance counter analysis to evaluate workloads and show how this can be measured on Haswell using likwid-perfctr and perf. In part 2 to follow, I’ll describe how top down metrics have been added to … Continue reading →

Posted in experiments | Tagged analysis technique, likwid-perfctr, perf, performance counters, top-down | 1 Reply

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/proc/stat analysis technique c-ray ftrace geekbench geekbench-description gromacs hyperthreading ipc kernelshark likwid likwid-perfctr likwid-topology memory metrics on_core on_cpu OpenFOAM parboil perf performance counters periodic sampling phoronix phoronix benchmark article phoronix cpu suite pmu_tools process tree progress report ptrace rusage Ryzen spectre system hang top-down trace-cmd virtualization wspy

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