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None Re: Surprisingly poor performance of Geant4.9.2.p01 on a bi-quad-core Intel xeon machine 

Forum: Installation and Configuration
Re: Question Surprisingly poor performance of Geant4.9.2.p01 on a bi-quad-core Intel xeon machine
Re: None Re: Surprisingly poor performance of Geant4.9.2.p01 on a bi-quad-core Intel xeon machine (Paul Nicholas Colin Gloster)
Date: 21 Sep, 2009
From: <icx719>

> Hello,
> 
> You have made it clear that the newer system was using a 64bit
> operating system and that the older system was using a 32bit operating
> system. 32bit executables can be faster than 64bit
> executables. However, you did not provide enough evidence to
> conclusively deduce that the wordlength accounts for your observations
> because:
> * you have not made it clear that both sets of measurements were for
>   Geant4.9.2.p01;
> * the Linux kernels do not differ merely by wordlength: they are
>   2.6.30-gentoo-r4 and 2.6.24-gentoo-r8;
> and
> * other potentially influential factors have been left unreported,
>   such as the compilers used; and the Geant configuration options used
>   when compiling and installing Geant.
> 
> Yours sincerely,
> Nicholas Paul Colin Gloster
> 

Hi,

The compiler used is gcc-4.1.2 in both machines. The same configuration option from Linux-g++ were used. For the quad-core machine I also tried to change the compiler ( gcc-3.4.6, 4.1.2 and 4.3.3) and options (like -mtune=native -msse4.1), but the results are almost the same.

I also tried to compile my Geant4 application by using mpicxx and then ran the executable with a single thread, but nothing gets better.

regards

Yong

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1 None: Re: Surprisingly poor performance of Geant4.9.2.p01 on a bi-quad-core Intel xeon machine   (Paul Nicholas Colin Gloster - 21 Sep, 2009)
(_ None: Re: Surprisingly poor performance of Geant4.9.2.p01 on a bi-quad-core Intel xeon machine   (icx719 - 21 Sep, 2009)
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