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Subject: [OMPI users] Use of __float128 with openmpi
From: Patrick Boehl (Patrick.Boehl_at_[hidden])
Date: 2014-02-01 12:42:47


Hi all,

I have a question on datatypes in openmpi:

Is there an (easy?) way to use __float128 variables with openmpi?

Specifically, functions like

MPI_Allreduce

seem to give weird results with __float128.

Essentially all I found was

http://beige.ucs.indiana.edu/I590/node100.html

where they state

----
MPI_LONG_DOUBLE
  This is a quadruple precision, 128-bit long floating point number.
----
But as far as I have seen, MPI_LONG_DOUBLE is only used for long doubles.
The Open MPI Version is 1.6.3 and gcc is 4.7.3 on a x86_64 machine.
Any help or comment is very appreciated!
Best regards,
Patrick