Re: [scipion-users] scipion-installer - how do i change compiler optimization flags?

[Lugmayr, W. <w.l...@uk...>]

dear all, 

just for documentation of the scipion 3.0.6 official release. 

i changed in xmipp.conf the line: 
CXXFLAGS= -mtune=native -march=native -std=c++11 -O3 
to 
CXXFLAGS= -mfma -mavx2 -m3dnow -fomit-frame-pointer -std=c++11 -O3 
and rebuild xmipp. 
now the exes run fine on intel and amd epyc processors. 

the flags come from recommended for gcc: 
https://prace-ri.eu/wp-content/uploads/Best-Practice-Guide_AMD.pdf 

cheers and thanks for the help, 
wolfgang 



From: "Carlos Oscar Sorzano" <co...@cn...> 
To: "Pablo Conesa" <pc...@cn...>, "David" <dst...@cn...>, dma...@cn..., "w lugmayr" <w.l...@uk...>, "Mailing list for Scipion users" <sci...@li...> 
Sent: Thursday, 29 October, 2020 16:11:16 
Subject: Re: Fwd: [scipion-users] scipion-installer - how do i change compiler optimization flags? 



Dear Wolfgang, 

in the compilation of Xmipp, you can set the environment variable CXXFLAGS before calling the xmipp script. From the Scipion installation I am not sure how to pass it to the xmipp script. It may be that setting it in the shell before calling scipion suffices. But I have never tried. 

Kind regards, Carlos Oscar 
El 29/10/2020 a las 11:13, Pablo Conesa escribió: 




? 


-------- Forwarded Message -------- Subject: 	[scipion-users] scipion-installer - how do i change compiler optimization flags? 
Date: 	Wed, 28 Oct 2020 14:19:29 +0100 (CET) 
From: 	Lugmayr, Wolfgang [ mailto:w.l...@uk... | <w.l...@uk...> ] 

Reply-To: 	Mailing list for Scipion users [ mailto:sci...@li... | <sci...@li...> ] 

To: 	Mailing list for Scipion users [ mailto:sci...@li... | <sci...@li...> ] 


hi, 

i installed and compiled scipion 3.0.5-devel on a system with intel cpus. 

when i run now scipion on new nodes with "AMD EPYC 7402" processors the executable fails with: 
$ scipion3 last Scipion v3.0.5 () devel 
sh: line 1: 45875 Illegal instruction python -m scipion last 

so i do not want to have 2 versions of scipion3 but maybe compile it with intel and amd compatibility flags. 
how do i set these flags? 

cheers, 
wolfgang 

-- 
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