[Wien] performance problem using ifort + Goto's lib

[Jorissen Kevin]

The most recent versions of MKL have implemented some improvements proposed by the authors of the Goto libs.  This may well explain your observation.
 
Kevin.
 

	-----Oorspronkelijk bericht----- 
	Van: Sun Yiyang [mailto:scip0105 at nus.edu.sg] 
	Verzonden: zo 3/28/2004 6:22 
	Aan: wien at zeus.theochem.tuwien.ac.at 
	CC: 
	Onderwerp: [Wien] performance problem using ifort + Goto's lib
	
	
	Dear WIEN2k users,
	 
	I just succeeded in installing WIEN2k on my two computers.
	I use ifc8 (i.e. ifort) and Goto's BLAS.
	The configurations of the two computers are:
	1. P4 3.2G 800 FSB + DDR 400 dual-ch RAM
	2. Xeon 2.4G + PC800 RDRAM, respectively. 
	I used the default optimization leverl, i.e. -O2.
	 
	I run the benchmark on the two systems. 
	The results are 258 sec and 350 sec, respectively.
	 
	I found, on the page http://www.wien2k.at/reg_user/benchmark/, that
	there are systems similar to mine, but all have better performance 
	(at least 10%). I wonder what options can be used for acquiring 
	the performance gain. I tried -O3, but the compilation failed.
	 
	Also, I noticed that the best performance on P4 systems was achieved 
	by using MKL. This is strange because normally Goto's lib is faster 
	than MKL. Anyway, I also tried MKL. Though the compilation passed,
	I got an error of "undefined symbol __intel_fast_memset". 
	Any comment on this would be appreciated. 
	 
	Sincerely,
	Yiyang
	 
	 

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