Intel® C++ Compiler 19.0 Developer Guide and Reference

Common Performance Pitfalls

Intel® Cilk™ Plus is a deprecated feature. Use OpenMP* or Intel® Threading Building Blocks instead. For more information see Migrate Your Application to use OpenMP* or Intel® TBB Instead of Intel® Cilk™ Plus.

If a program has sufficient parallelism and burdened parallelism but still doesn't achieve good speedup, the performance could be affected by other factors. Here are a few common factors, some of which are discussed elsewhere.