Re: improving numerical applications performance
Re: improving numerical applications performance
- Subject: Re: improving numerical applications performance
- From: Amilcar Meneses Viveros <email@hidden>
- Date: Tue, 18 May 2004 05:56:52 -0500 (CDT)
>
> The following table has a better information:
>
>
>
> OS Mac OS X | Linux | Solaris | Linux
>
> CPU POWER PC | Pentium4 | SPARC | Pentium4 Xeon
>
> SPEED 400 MHZ | 1.5 GHZ | 2GHZ | 3.06GHZ
>
> RAM 512MB | 256MB | 512MB RAM | 512MB
>
> -------------------+-----------+-----------+------------
>
> TIME 372.95min | 134.58min | 264.6min | 65.5min
>
>
It is interesting to normalize, using clock rate, the numbers above...
>
>
Normalized times: 372.95 | 504.68 | 1,323 | 501.08
>
>
So for the processing you are doing (as generated by the compiler) the
>
PPC is the most efficient of all of the processors in terms of clock
>
speed, in other words it does more of this work load per clock then the
>
other processors.
You are right, I didn't normalize. The problem is that I was in shock
when I get the executions times and I didn't analyze them.
>
> how can I improve the performance of a numeric
>
> application in a simple way? (i.e. from the gcc compiler)
>
>
Not easily, it depends on what your algorithm does and how it works.
>
>
Summary of things you can do using altivec...
>
<http://developer.apple.com/hardware/ve/summary.html>
>
> I have notice tha compilers like vcc can improve the performance if
>
> you work with float data, but not with a double data. But, many
>
> mathematics functions of the library are (by defautl) in double, and
>
> what
>
> can I do whether I really need a double precision?
>
>
>
> Perhaps I used a bad tool for measure the time, in such case, somebody
>
> know a better way for do it?
>
>
If you haven't already, look at
>
<http://developer.apple.com/hardware/ve/vector_libraries.html> and
>
<http://developer.apple.com/hardware/ve/algorithms.html> for any vector
>
accelerated operations that you can leverage.
>
>
The top page for all of this <http://developer.apple.com/hardware/ve/>
>
>
-Shawn
Thanks Shawn for your answers, I'm going to read the information that you
refer, .... now I have a lot of homework to do ( he he he )...
Best regards
Amilcar
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