Developer Guide

Contents

Use Intel® VTune™ Profiler

To view performance data, you can upload your
profile.json
file to the
CPU/FPGA Interaction View
in the Intel® VTune™ Profiler. For more information about how to upload the file and open the correct views, refer to CPU/FPGA Interaction Analysis (Preview) in the
Intel® VTune™ Profiler User Guide
.
You can use the
CPU/FPGA Interaction View
in the Intel® VTune™ Profiler to determine performance information about your design in various graphical representations. You can view the following:
  • Summarized or average data about your DPC++ kernels.
  • A graphical representation of the overall kernel program execution process, including both host and device side events.
  • Detailed statistics about memory and pipe accesses in both a source view format and timeline format.
The following tables describe types of performance data and information available in the
CPU/FPGA Interaction View
in the Intel® VTune™ Profiler:
Types of Performance Data
Column
Description
Access Type
Attributes
Memory or pipe attributes information such as memory type (local or global), corresponding memory system (DDR or quad data rate (QDR)), and read or write access.
All memory and pipe accesses
Stall%
Percentage of time the memory or pipe access is causing pipeline stalls. It is a measure of the ability of the memory or pipe access to fulfill an access request.
All memory and pipe accesses
Occupancy%
Percentage of the overall profiled period when a valid work-item executes the memory or pipe instruction.
All memory and pipe accesses
Bandwidth
Average memory bandwidth that the memory access uses and its overall efficiency. For each global memory access, FPGA resources are assigned to acquire data from the global memory system. However, the amount of data a kernel program uses might be less than the acquired data. The overall efficiency is the percentage of total bytes acquired from the global memory system that the kernel program uses.
Global memory accesses

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.