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Home→Published 2018 → April 1 2 3 >>

Monthly Archives: April 2018

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TODO list at end of April

Performance analysis, tools and experiments Posted on 2018-04-30 by mev2018-04-30

As April finished, useful to take stock of where analysis is at as well as next steps. During May, I may also take a few week break to finish publishing my book and a cycle trip- so also useful to … Continue reading →

Posted in tools | Tagged progress report | Leave a reply

wspy – memory analysis for processes; need to sanity check the metrics…

Performance analysis, tools and experiments Posted on 2018-04-29 by mev2018-04-30

As a followup to this post, I’ve implemented per-process capture of backend counters. I can now create a memory report from a process tree.

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Posted in analysis, experiments, tools | Tagged memory, metrics, top-down | Leave a reply

wspy – added –perfcounter-model application

Performance analysis, tools and experiments Posted on 2018-04-29 by mev2018-04-29

I have added a new mode: –perfcounter-model application this supplements the previous two modes: –perfcounter-model process –perfcounter-model core This mode works similar to the process model, except only the root process is instrumented and then the “inherit” flag is passed. … Continue reading →

Posted in tools | Tagged performance counters, wspy | Leave a reply

Adding robustness to building process trees

Performance analysis, tools and experiments Posted on 2018-04-28 by mev2018-04-28

The ptrace(2) man page shows how one can subscribe for events such as PTRACE_EVENT_FORK or PTRACE_EVENT_VFORK type events that happens when a process calls fork()/vfork(). At such an event one can then call ptrace(PTRACE_GETEVENTMSG,…) to retrieve the pid of the … Continue reading →

Posted in tools | Tagged ftrace, process tree, ptrace | Leave a reply

wspy – added topdown memory analysis

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

As a followup to a previous post, I’ve added support to wspy for topdown analysis for backend stalls.

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Posted in tools | Tagged memory, top-down, wspy | 1 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

wspy – process tracing, lost nodes and potential refactoring

Performance analysis, tools and experiments Posted on 2018-04-20 by mev2018-04-21

One of the tough bugs I’ve noticed sometimes pop up is an “orphaned” process tree in my tree. When I’ve collected trees of processes, very occasionally I’ll have a tree node drop on the floor and show up as an … Continue reading →

Posted in tools | Tagged wspy | Leave a reply

Set up Ryzen 7 1700 system

Performance analysis, tools and experiments Posted on 2018-04-19 by mev2018-04-20

I have set up a Ryzen 7 1700 system. I bought it at Costco at point it was discounted at point the older CPUs are getting discounted in time for newer.

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Posted in hardware | Tagged Ryzen | Leave a reply

Phoronix benchmarks – new Ryzen processors; looking @ the workloads

Performance analysis, tools and experiments Posted on 2018-04-19 by mev2018-06-14

AMD released new Ryzen processors today. Phoronix published an article that benchmarked these processors. Anand Tech also published a review. TechReport also wrote a review. The posting is *not* measured on these new processors. Instead, it looks at dissecting the … Continue reading →

Posted in analysis, experiments, workloads | Tagged phoronix, Ryzen | Leave a reply

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