OpenAcc + stop : Warning: ieee_inexact is signaling ?

Accelerated Computing HPC Compilers Legacy PGI Compilers
1

Hello .

A strange WARNING generate by the STOP statement after a simple OpenAcc kernels
( or any other statement a suppose ? )

Same warning for pgi/13.10 & pgi/14.9

PROGRAM titi 

  REAL :: a(10000)

  !$acc kernels
  a(:) = 1.0
  !$acc end kernels

  print*,'a=', a(1)

  stop

END PROGRAM titi



pgf90 --version

pgf90 13.10-0 64-bit target on x86-64 Linux -tp nehalem

pgf90 -ta=nvidia:cuda5.5 simple_acc.f90 -o simple_acc

./simple_acc
a= 1.000000
Warning: ieee_inexact is signaling
FORTRAN STOP

Without the STOP statement , or on the HOST the warning disappear ??

./simple_acc
a= 1.000000

Bye

Juan

2

Hi Juan,

As of the F2003 standard, STOP is required to print out any exception that may have occurred. You can disable this message by setting the environment “NO_STOP_MESSAGE=1”.

As for the message itself, many types of floating operations may trigger an “inexact” exception. In this case it’s an integer to real conversion and is benign.

Hope this helps,
Mat

3

Hello Mat :-)

Ok the message is benign.

But is completely wrong .

;-) Where did you see an integer to real conversion in :

a = 1.0

The original test case was much bigger and I couldn’t find on this where I was doing
inexact operations on the GPU .

The answer is , no where .
The compiler or acc translator is issuing the message for a wrong reason …

Bye

Juan