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 →
Geekbench is a system benchmark that I see frequently in comparing Android devices such as tablets or mobile phones. The benchmark is also available for PC processors running Windows and Linux. Geekbench is developed and sold by Primate Labs. I … Continue reading →
This article summarizes three overall metrics to assess performance of a workload running on a microprocessor. These metrics provide an overall picture of what determines the performance and provide clues on where to dig for a deeper understanding. Following the … Continue reading →
wspy is both a code base and a tool for performance analysis. As a code base, I modify wspy to run particular experiments and measurements. This lets me experiment trying particular techniques and interfaces to create a quick and dirty … Continue reading →
wspy is now enhanced to provide two new metrics, for a particular process tree: on_cpu – what percentage of the total time are all the cores scheduled to run in either user or system time? on_core – what percentage of … Continue reading →
Found a new tool for creating and browsing kernel ftrace events.
Continue reading →As a followup to my post about ptrace vs ftrace I have added a basic ptrace support to wspy.
Continue reading →While the names sound different, ptrace and ftrace are two rather different methods of implementing process instrumentation.
Continue reading →I have enhanced wspy to add –set-counters option.
Continue reading →Added a new option to wspy to get the performance counters from the linux kernel. This builds on my previous learnings to inventory the system and build counter information provided by the system including event numbers, umasks and other fields.
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