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Old 05-14-2004, 02:02 PM   #1
sethgeekx86
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optimizing to Athlon XP


What file do i edit so every time i run make it optimizing to An Athlon XP cpu.
 
Old 05-14-2004, 02:25 PM   #2
J.W.
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I think what you're asking about is a custom compile of your kernel. One of the configurable options is the Processor family; you would just want to choose Athlon. -- J.W.
 
Old 05-14-2004, 03:01 PM   #3
keefaz
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You can ./configure your program with cpu optimisation like this :

CFLAGS="-O2 -march=i486 -mcpu=athlon-xp" ./configure

Edit :
- O2 (note : O like Optimise not 0 like 0 + 1) add optimisation (level 2)
-march set the binary compatibility
-mcpu set optimisation for processor

For more details do 'info gcc'

Last edited by keefaz; 05-14-2004 at 04:45 PM.
 
Old 05-14-2004, 05:07 PM   #4
sethgeekx86
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I wondering if there is one file i can edit so every time i build something it goes to Athlon XP.
 
Old 05-14-2004, 05:11 PM   #5
keefaz
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I don't think it is possible due to the diversity of software package structures, and for those written in c++ there are more flags to do optimisation.
 
Old 05-14-2004, 08:03 PM   #6
thegeekster
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Quote:
Originally posted by sethgeekx86
I wondering if there is one file i can edit so every time i build something it goes to Athlon XP.
Why not add that CFLAGS variable keefaz posted as an environment variable to your startup script, such as ~/.bashrc.......I use the following entries in my startup script:
Code:
CFLAGS='-O2 -march=i586 -mcpu=athlon -pipe'
CXXFLAGS="$CFLAGS"
export CFLAGS CXXFLAGS
The "CXXFLAGS" variable is for C++ binary optimization, "CFLAGS" is for C binary optimization

By doing this, when configuring an app, these variables are usually picked up by automake and added to the Makefile created from the ./configure command.........There are a few exceptions where an app will ignore these evironment variables, but for the most part they will be included automatically.......One app I know that ignores these variables is compiling QT, it uses '-O2 -march=i486 -mcpu=i686', no matter what you try to pass it.......

BTW.....the '-pipe' option is compiler option that tells the compiler it can pipe it's commands while compiling an app......helps speed up compiling

Also, after adding anything to the startup script. be sure to update it by using the 'source' command. For example:

source ~/.bashrc


Last edited by thegeekster; 05-14-2004 at 08:12 PM.
 
Old 05-15-2004, 07:44 AM   #7
keefaz
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Nice tip thegeekster, I hadn't the idea to add CFLAGS to .bashrc, I will do now
 
Old 05-20-2004, 09:03 AM   #8
tank728
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fells I have a pentium4 so I can just put -mcp=pentium4 right? But also I do not have ~/.bashrc should I create it with jsut those 3 lines of code that thegeekster mentioned? The closest file I have to ~/.bashrc is ~/.bash_history.

-tank
 
Old 05-20-2004, 03:28 PM   #9
thegeekster
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tank:

.bashrc in a user's home directory is not created by default.............so yes, create one with those variables
 
  


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