Developer Guide

Contents

Force Fewer Read Data Reorder Units to Reduce Area (
-Xsnum-reorder
)

When the
Intel® oneAPI
DPC++/C++
Compiler
implements a ring topology for the global memory interconnect (either by automatic choice or by forcing the ring through
-Xsglobal-ring
), it widens the interconnect by default to allow more reads to occur in parallel. This allows for saturation of the global memory throughput using read-only traffic.
To narrow the interconnect in order to save area while reducing read-only throughput, use the
-Xsnum-reorder=N
option in your
dpcpp -fintelfpga -Xshardware
command, where
N
is the number of bank's worth of read bandwidth you desire. For example, if on a two-bank BSP, you require only one bank's worth of read bandwidth, set
-Xsnum-reorder=1
.
Example
dpcpp -fintelfpga -Xshardware -Xsnum-reorder=1 <source_file>.cpp

Product and Performance Information

1

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