Re: performance tuning differences?

["mulyadi" <a_mulyadi@telkom.net>]

hello all

>What I found odd was the same exact floating point intensive code compiled 
>and run on the same exact hardware performed 20% WORSE under redhat linux 
>7.1 (20% better using RH 6.2), both straight installs out of the box.

well, if we just pay attention on the version of Linux's distribution , we can't tell, what is exactly the cause of the problem. You should look into the distribution, which kernel version do they use, what version of c/fortran compiler  they use, etc. These are main factor which determine the perfomance of your apps.

You should aware that Linux isn't Windows. Linux distribution (redhat, suse, etc) are built upon several software that are packed together into a distribution

>What I meant to ask, given the same code, and just looking at system OS 
>configuration, is there anything to watch for?  do you find stripping down 
>daemons improve performance significantly, libraries/compilers to 
>avoid/suggest?  OS versions/configurations that have deep performance 
>differences?

Yes, these are things worthy to watch for. Put it simple, EVERYTHING running on your system determine the overall perfomance of the system. For example, shutting down unnecessary down will speed up the system. although not so big

regards

Mulyadi



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