AI – Perfspect

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Questions and Answers

What type of data does PerfSpect collect?

Performance data (correct)

System stats

Raw telemetry data

Programming code

True or false: PerfSpect is a programming language.

False

What is the similarity analyzer used for?

To compare performance metrics between different workloads

To collect performance metrics from Intel hardware

To compare multiple workloads based on telemetry data (correct)

To retire workloads that are not waiting for resources

True or false: The online phase of PerfSpect collects application performance metrics.

False Signup and view all the answers

How many default files are generated during the offline post-processing phase?

3 Signup and view all the answers

What can PerfSpect be used for?

To solve a problem that was causing a system to have a lower latency Signup and view all the answers

What can PerfSpect be used for?

Generating insights into applications Signup and view all the answers

True or false: The Metric_out_average file is used to analyze results and deduce insights.

True Signup and view all the answers

What does PerfSpect do before being released to the public?

Validated internally Signup and view all the answers

What type of hardware does PerfSpect use to collect PMU data?

Intel hardware Signup and view all the answers

What are workloads that are more frontend or backend bound clustered in?

Lower left and lower right quadrants Signup and view all the answers

True or false: The 3rd Gen Intel® Xeon® Scalable processor has four general programmable counters.

False Signup and view all the answers

What is the Umask filter used for?

Reducing the number of groups needed Signup and view all the answers

True or false: The Umask filter was extended to 64-bit in the 4th Gen Intel® Xeon® Scalable processor.

False Signup and view all the answers

What is PerfSpect?

A tool to collect performance metrics from Intel hardware Signup and view all the answers

How many fixed counters does the 3rd Gen Intel® Xeon® Scalable processor have?

4 Signup and view all the answers

What is the most used file to analyze results and deduce insights?

Metric_out_average Signup and view all the answers

What is the purpose of PerfSpect?

To collect performance data Signup and view all the answers

What does PerfSpect require for use?

Nothing Signup and view all the answers

What type of processor does the Umask filter extend to?

64-bit Signup and view all the answers

Study Notes

PerfSpect is a telemetry tool that collects performance data from your workload or application on your production servers.
PerfSpect is lightweight and can be used without any need for programming.
PerfSpect uses perf drivers to collect PMU data from Intel® hardware.
PerfSpect can be used to characterize your workload or application and identify potential bottlenecks.
PerfSpect can be used to post-process raw telemetry data to generate insights into your application's performance.
PerfSpect is a performance analysis tool that collects raw telemetry data from the processor microarchitecture.
The online phase collects system stats, and the offline post-processing phase converts the raw telemetry data to more readable performance metrics.
There are three default files generated during the offline post-processing phase: Metric_out is a time series dump of all the metrics calculated, Metric_out_average is the most used file to analyze results and deduce insights, and Metric_out_p95 is a 95th percentile file to analyze results.
The 3rd Gen Intel® Xeon® Scalable processor has four fixed counters, which frees up the scarce general programmable counters to reduce the number of groups needed to collect telemetry for a certain metric.
The Umask filter was extended to 64-bit in the 3rd Gen Intel® Xeon® Scalable processor.

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Description

Learn about PerfSpect, a lightweight telemetry tool used for performance analysis of workloads and applications on production servers. Discover how it collects raw telemetry data and post-processes it to generate insights into application performance.