3.9.5: much improved threading

Guys,

I have finally gotten 3.9.5 out the door.  It's been several months, but I've
actually been busy the whole time.  The big news is that I finally finished
a complete rewrite of ATLAS's threading system.  You will see only a small
difference for 2-processor machines, but on 4 and 8 processor machines,
the new threaded code can more than double your performance (assuming you
aren't on a loser OS like MacOS X or FreeBSD, that don't posses processor
affinity).  I posted some factorization timings at:
   http://math-atlas.sourceforge.net/timing/3_9_5/index.html

This code is all pretty new, and since I rewrote everything, we can probably
expect a segfault-fest, but it at least passes the sanity tests on Windows
and Linux.  It is still fairly rough, and as the timing page mentions, I need
to do some tuning for small-case factorizations.

Let me know if you use it,
Clint

ATLAS 3.9.5 released 12/11/08, Changes from 3.9.4:
   * Complete rewrite of ATLAS threading system:
     - Now supports native windows threads in addition to pthreads
     - Use of master-last and affinity increases threaded performance, with
       an advantage that grows with P (almost no advantage for P=2, but for
       instance LU is more than 60% faster asymptotically on a P=8 Core2)
       + OS X and FreeBSD don't support processor affinity, and so their
         performance is still bad
   * Changed emit_buildinfo so that it replaces all control characters with
     spaces (prevents errors under windows).
   * Added dependency info for ATL_ilaenv so that it is recompiled once
     lapack tuning is complete
   * Fixed error in configure where it issues commands in wrong directory
     when the user builds lapack directly from a tarfile
   * Fixed typos in config.c where I used 'comp' rather than 'comps'.
   * Added mmtime_pt.c, which can allow us to find kernels that do well
     in parallel operation.
   * Various small configure fixes for windows

**************************************************************************
** R. Clint Whaley, PhD ** Assist Prof, UTSA ** www.cs.utsa.edu/~whaley **
**************************************************************************

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