Benchmarking LLVM's Clang OpenMP Support Against GCC

Written by Michael Larabel in Software on 29 May 2014. Page 3 of 3. 7 Comments

From this quick testing of the out-of-tree Clang OpenMP support on the previous page, it's working and offering better performance for multi-core systems, but still it doesn't seem to be as well optimized as GCC 4.9. Further tests with more C/C++ OpenMP codes and on greater-core systems will be forthcoming on Phoronix, especially if the OpenMP support is merged ahead of the LLVM 3.5 release this summer.

Outside of OpenMP, the LLVM Clang vs. GCC results continue to vary:

Those were just some quick non-OpenMP codes I tested as well just for reference purposes of GCC vs. Clang on this Intel Core i7 system running 64-bit Ubuntu 14.04.

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Michael Larabel

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.