OpenMP test report updated

I have re-run the per-thread OpenMP benchmarks for the many 
GraphicsMagick algorithms on a number of different systems and have 
updated the test report at "http://www.graphicsmagick.org/OpenMP.html".

This testing reflects the code which will be the 1.3.1 release.

Performance is very good, with speedup peaking to 2.15 on a two core 
system, 2.85 on a two core hyperthreaded system, and 3.93 on a four 
core system.

OpenMP scheduling parameters have been adjusted to favor repeatable 
best performance with varying system load rather than absolute peak 
performance.  We think that this is important for server environments.

We also found a JPEG encoding parameter which was set for best 
possible quality at the (sometimes) expense of performance.  This 
resulted in GM writing JPEG files slower than ImageMagick on 'x86 
hardware.  For GM 1.3.1, the libjpeg default is used by default but it 
will be possible for the user to specify the desired DCT encoding 
algorithm to use.

Bob
======================================
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


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