[Trilinos-Users] tracking down NaNs: best practices?

[Hoemmen, Mark]

With C99 support or compiler extensions, you can set the CPU's floating-point flags so that NaNs always raise a floating-point exception when computed.  This happens even when you want to make a NaN on purpose (e.g., "return 1.0 / 0.0;"), so it may not always be helpful.  However, it's worth a try.

mfh
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Sent: Friday, October 21, 2011 12:00 PM
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Subject: Trilinos-Users Digest, Vol 74, Issue 17

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Today's Topics:

   1. tracking down NaNs: best practices? (Nico Schl?mer)


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Message: 1
Date: Fri, 21 Oct 2011 19:07:58 +0200
From: Nico Schl?mer <nico.schloemer at ua.ac.be>
Subject: [Trilinos-Users] tracking down NaNs: best practices?
To: "Trilinos Users" <Trilinos-Users at software.sandia.gov>
Message-ID: <4EA1A6EE.9070400 at ua.ac.be>
Content-Type: text/plain; charset=iso-8859-1; format=flowed

Hi all,

I'm just trying to track down some NaNs that (sometimes) appear on mpi
runs in a code that touches various Trilinos packages.
Doing so, I find myself climbing through Trilinos methods and the
classes with plenty of 'std::cout's which obviously takes much time.
There must be a better way to do this. (Trilinos compile options, helper
methods...?)

Any hints?

Cheers,
Nico



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