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Phoronix Test Suite

OpenBenchmarking Benchmarking Platform
Phoromatic Test Orchestration

GCC 4.6, LLVM/Clang 2.9, DragonEgg Five-System Benchmarks

Michael Larabel

Published on 28 March 2011
Written by Michael Larabel
Page 8 of 8 - 10 Comments

With x264 H.264 video encoding, GCC was marginally faster than DragonEgg and Clang on all of the systems.

Where Clang (and DragonEgg) seem to do universally better than GCC is when it comes to measuring the compiling time for the software it builds. Clang and DragonEgg are much faster at compiling than GCC.

In terms of which compiler produces the fastest C / C++ binaries, there is no one dominant compiler. With some applications, using LLVM with the Clang compiler front-end is the fastest where as with others the mature GCC compiler holds its ground, and in others, using GCC but with LLVM's code generator and optimizer via DragonEgg provides a unique advantage. It really depends upon your particular environment and other factors (if doing any compiler tuning, debugging possibilities with different compilers, and other distinct features to GCC and LLVM) as to which compiler is superior.

From the tests today and past benchmarks, LLVM/Clang does appear to almost always compile C / C++ code faster than using GCC, but at the same time, there's still software out there that doesn't build under Clang or is problematic. There are also other compilers out there like Open64, PCC, TCC, and ICC.

Via 1103264-IV-1103253IV95 these results can be further analyzed, exported, and compared against using OpenBenchmarking.org and the Phoronix Test Suite.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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