Developer Guide

Contents

Disable Hardware Kernel Invocation Queue (
-Xsno-hardware-kernel-invocation-queue
)

To direct the
Intel® oneAPI DPC++/C++ Compiler
to reduce kernel area use by removing kernel invocation queue in DPC++ kernel, include the
-Xsno-hardware-kernel-invocation-queue
option in your
clang++
command.
Example
dpcpp -fintelfpga -Xshardware -Xsno-hardware-kernel-invocation-queue <source_file>.cpp
Using this option may result in longer kernel execution time as the kernel invocation queue allows DPC++ runtime environment to queue kernel launches in accelerator so that the accelerator can start execution on the next invocation as soon as previous invocation of the same kernel is complete.
Use the
-Xsno-hardware-kernel-invocation-queue
option only when your kernel execution time is much greater than the system and DPC++ runtime environment overhead hidden by the kernel invocation queue (20-100us), or if the
Intel® oneAPI DPC++/C++ Compiler
has a difficulty fitting your kernel.
Refer to Utilizing Hardware Kernel Invocation Queue for more information about how to utilize the kernel invocation queue.

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