Intel® VTune™ Profiler User Guide

User Guide

Contents

Effective Physical Core Utilization

Metric Description

This metric represents how efficiently the application utilized the physical CPU cores available and helps evaluate the parallel efficiency of the application. It shows the percent of average utilization by all physical CPU cores on the system. Effective Physical Core Utilization contains only effective time and does not contain spin and overhead. An utilization of 100% means that all of the physical CPU cores were loaded by computations of the application.

Possible Issues

The metric value is low, which may signal a poor physical CPU cores utilization caused by:
  • load imbalance
  • threading runtime overhead
  • contended synchronization
  • thread/process underutilization
  • incorrect affinity that utilizes logical cores instead of physical cores
Explore sub-metrics to estimate the efficiency of MPI and OpenMP parallelism or run the Locks and Waits analysis to identify parallel bottlenecks for other parallel runtimes.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804