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[MANTA] gcc compiler optimizations


Chronological Thread 
  • From: James Bigler <bigler@cs.utah.edu>
  • To: "'manta@sci.utah.edu'" <manta@sci.utah.edu>
  • Subject: [MANTA] gcc compiler optimizations
  • Date: Fri, 27 May 2005 11:12:36 -0600
I tried a few of the flags Steve put in there for GCC on Mac and I saw a noticible improvement on my Pentium 4 Xeon 2 GHz machine running linux.

With GCC 3.3.2 I ran:

bin/manta -bench 20 10

-O3
Benchmark completed in 10.8703 seconds (20 frames, 1.83987 frames per second)

-O3 -fgcse-sm -funroll-loops -fstrict-aliasing -fsched-interblock -falign-functions=16 -ffast-math -freorder-blocks

Benchmark completed in 8.71735 seconds (20 frames, 2.29427 frames per second)

added -march=pentium4
Benchmark completed in 8.52678 seconds (20 frames, 2.34555 frames per second)

So, just by adding a few flags I improved the framerate on the default scene by about 25%. Not too bad.

What other types of optimizations are people using for linux based systems and GCC?

James



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