• 2021.1
  • 12/04/2020
  • Public Content

Tutorial: Debugging with Intel® Distribution for GDB* on
OS Host

This tutorial describes basic scenarios of debugging Data Parallel C++ (DPC++) and OpenCL™ applications on a CPU
, GPU, and an FPGA emulator
using Intel® Distribution for GDB*.


Check the and complete all setup steps depending on whether you aim at debugging on a CPU or a GPU.

Debugging a Kernel on CPU and GPU: Major Differences

In comparison to debugging on a CPU, debugging a kernel on a GPU has a few differences:
  • All threads are vectorized and process several data elements simultaneously, if possible.
  • An execution channel (SIMD lane) is referred to as a logical unit of execution for accessing data elements within an instruction. When kernels are compiled in debug mode, most SIMD instructions have 8 execution channels. This is referred as the SIMD width.
  • Inferior calls (calling kernel functions from inside the debugger as part of expression evaluation) are not supported.

Product and Performance Information


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