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README.md

Data movement clauses and reductions: dot product

Calculate the dot product of two vectors (r = sum[ A(i) x B(i) ]) in parallel using OpenMP.

A working serial code is provided in dot-product(.c|.F90).

  1. Try to accelerate the code first using worksharing constructs without any clauses. Are you able to get the correct result with the GPU accelerated code? Compiler diagnostics may provide hints about possible issues. Also set environment variable export CRAY_ACC_DEBUG=3 to see what is really happening at runtime, in particular if you use c/c++ compiler.

  2. Add proper clauses to the OpenMP directives so that code works correctly. Add also clauses for avoiding unnecessary memory copies (i.e. vectors do not need to copied back from device). Use compiler diagnostics and runtime debug for finding out if the clauses had desired effect.