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PO
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Id
53826
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AcceptedAnswerId
0
AnswerCount
0
ClosedDate
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1
CommunityOwnedDate
CreationDate
2008-09-10T11:52:50.093
FavoriteCount
0
LastActivityDate
2008-09-15T06:45:29.930
LastEditDate
2008-09-15T06:45:29.930
LastEditorUserId
4992
OwnerUserId
4992
ParentId
53811
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
Claes Mogren
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Body
As a Gentoo user I have tried quite a few optimizations on the complete OS and there have been endless discussions on the <a href="http://forums.gentoo.org/" rel="noreferrer">Gentoo forums</a> about it. Some good flags for GCC can be found in the <a href="http://gentoo-wiki.com/Safe_Cflags" rel="noreferrer">wiki</a>. In short, optimizing for size worked best on an old Pentium3 laptop with limited ram, but on my main desktop machine with a Core2Duo, -O2 gave better results over all. There's also a <a href="http://www.pixelbeat.org/scripts/gcccpuopt" rel="noreferrer">small script</a> if you are interested in the x86 (32 bit) specific flags that are the most optimized. If you use gcc and really want to optimize a specific application, try <a href="http://www.coyotegulch.com/products/acovea/" rel="noreferrer">ACOVEA</a>. It runs a set of benchmarks, then recompile them with all possible combinations of compile flags. There's an example using Huffman encoding on the site (lower is better): <pre><code>A relative graph of fitnesses: Acovea Best-of-the-Best: ************************************** (2.55366) Acovea Common Options: ******************************************* (2.86788) -O1: ********************************************** (3.0752) -O2: *********************************************** (3.12343) -O3: *********************************************** (3.1277) -O3 -ffast-math: ************************************************** (3.31539) -Os: ************************************************* (3.30573) </code></pre> (Note that it found -Os to be the slowest on this Opteron system.)
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1. POHow do you normally set up your compiler's optimization settings?
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1. USClaes Mogren
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1. USClaes Mogren
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1. POHow do you normally set up your compiler's optimization settings?
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1. COThe first sentence of your answer reminds me of http://web.archive.org/web/20041230075641/http://www.funroll-loops.org/
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