[Coin-discuss] Cbc and miplib3

[John J Forrest]

Sven,

Helped by your hints I have been playing with different optimization 
levels and debug.  If I use -g and NDEBUG is not defined (so asserts are 
all active) everything seems fine.  If I use -On and NDEBUG is defined all 
my tests work.  If I use -On and NDEBUG is not defined then I did manage 
to trigger some asserts e.g assert (theta>=0.0) when theta was -1.0e-15. I 
presume that this is due to the arithmetic being done in two different 
ways when optimization is on.

So I have removed some of these asserts so that should help.

There were one or two places were it seemed there was an abort without any 
assert.  I could only find one likely place for that to happen and it 
could not occur if NDEBUG was defined.  I have added a message so you can 
tell me if that was the problem - then I can look further.

By the way for Clp and Coin as a whole there is a slight performance 
penalty if NDEBUG is not defined.  the latest Makefile.Linux sets NDEBUG 
if any optimization is done which may explain some of the difference 
between Linux and Sun/Mac.

keep me informed how things go.

John Forrest



Sven de Vries <devries at ma.tum.de> 
Sent by: coin-discuss-bounces at list.coin-or.org
12/19/2004 08:51 AM
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[Coin-discuss] Cbc and miplib3






Hi,

since last week it seems that Cbc aborts (without further explanation) on
lots of miplib3 problems (I observe this on sun and macosx).
(using the runtime script from Sbb/Samples...)

sven

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