[Users] Test failures

[Frank Löffler]

On Thu, Nov 14, 2013 at 12:55:57AM +0100, Ian Hinder wrote:
> This is likely due to the Exact thorn.  It also fails on Stampede.  I
> have added an EinsteinExact version of this test, and this passes on
> my laptop, on datura, and on stampede.  I propose we remove the Exact
> version of this test, since the tested functionality is available in
> EinsteinExact, and Exact is anything but…

I agree, we should remove these testsuites after the release.

> Is your workstation optionlist in simfactory? What optimisation settings are you using?

Yes. It's debian.cfg and debian-intel.cfg.

> 	-Ofast
> 	-O3

This uses -O2 without very special options. However, it uses -xHost (to
be general and somewhat fast). According to the man-page this defaults
to -no-prec-div on some systems. Maybe we should add -proc-div to this
option list.

Quote:

With some optimizations, such as -msse2 (Linux* OS) or /arch:SSE2
(Windows* OS),  the  compiler  may  change  floating-point  division
computations into multiplication by the reciprocal of the denominator.
For example,  A/B  is computed as A * (1/B) to improve the speed of the
computation.

Frank

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