On Tue, 2007-10-16 at 17:40 +1000, skaller wrote: > On Mon, 2007-10-15 at 03:26 +1000, skaller wrote:
> Preliminary tests with Ubuntu-gutsy, gcc 4.2.1 with -fopenmp and some > tutorial examples show openmp SLOWS down code going from 1 to 2 threads > on a dual core AMD64x2 by a massive amount. The examples do appear to > work correctly. The CPU monitor definitely pushes both cores > up to 100%. Retesting with -O3 on advice of Joe Buck, the coarse parallelism test finally ran faster with 2 threads than 1. The fine test (order 1K FLOPS) used 3 times more CPU total, so took 50% more time on a dual core. -- John Skaller <skaller at users dot sf dot net> Felix, successor to C++: http://felix.sf.net ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Felix-language mailing list Felix-language@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/felix-language
