Divide by zero allowed?

[mankoff]

I'm getting the following error:

Thread 1 "r01.exe" received signal SIGFPE, Arithmetic exception.
0x00007ffff7b58b12 in blitz::Divide<double, double>::apply (a=1, b=0) at /home/kdm/projects/GISS/LIME/opt/include/blitz/ops.h:147
147	BZ_DEFINE_BINARY_OP(Divide,/)

From this line:

blitz::Array<double,1> sIpvXOp(1. / IpvXOp->wM);

Is there a flag I can set to allow divide-by-zero to return NaNs rather than SIGFPE? I've compiled Blitz with

CFLAGS="-fPIC" \
 FCFLAGS="-fPIC -DNDEBUG" \
 CPPFLAGS="-fPIC -DNDEBUG" \
 cmake .. \
  -D CMAKE_INSTALL_PREFIX=${LIME_ROOT}/opt \
  -D CMAKE_INSTALL_LIBDIR=${LIME_ROOT}/opt/lib \
  -D Python_EXECUTABLE=${MAMBA_ENV}/lime/bin/python

make -j
make install

(original issue at NASA-GISS/LIME#1)

[citibeth]

It looks like this is being built with GCC. As per GNU docs, compile with traps converts NaNs into arithmetic exceptions:

https://www.gnu.org/software/libc/manual/html_node/FP-Exceptions.html

It's hard to know what flags you are calling GCC with because a lot of stuff could be hidden inside the CMake file. Instead of make -j, try running VERBOSE=1 make (or make VERBOSE=1) to get the GCC command line being used to build Blitz++.

Have you tried compiling Blitz++ without traps, but ModelE with traps? Is there a debugging need for traps within the Blitz++ code?

[mankoff]

Yes, I'd like traps for ModelE, IceBin, etc. but not lower level code like blitz or PETSc (although sometimes trapping in PETSc is helpful to find matrix dimension disagreements). I was trying to achieve that with the -DNDEBUG flag. Do you have suggestions for other options?

I added -D CMAKE_VERBOSE_MAKEFILE=ON to the cmake .. command, and VERBOSE=1 make.

results

$ VERBOSE=1 make
/usr/bin/cmake -S/home/kdm/projects/GISS/LIME/src/blitz -B/home/kdm/projects/GISS/LIME/src/blitz/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/kdm/projects/GISS/LIME/src/blitz/build/CMakeFiles /home/kdm/projects/GISS/LIME/src/blitz/build//CMakeFiles/progress.marks
make  -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
make  -f blitz/array/CMakeFiles/stencil-classes.cc.dir/build.make blitz/array/CMakeFiles/stencil-classes.cc.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/array /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array/CMakeFiles/stencil-classes.cc.dir/DependInfo.cmake --color=
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make  -f blitz/array/CMakeFiles/stencil-classes.cc.dir/build.make blitz/array/CMakeFiles/stencil-classes.cc.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array && /home/kdm/local/mambaforge/envs/lime/bin/python /home/kdm/projects/GISS/LIME/src/blitz/blitz/array/../generate/genstencils.py stencil-classes.cc MAIN_DEPENDENCY /home/kdm/projects/GISS/LIME/src/blitz/blitz/array/../generate/genstencils.py
Generating file stencil-classes.cc
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make  -f blitz/generate/CMakeFiles/genvecbops.dir/build.make blitz/generate/CMakeFiles/genvecbops.dir/depend
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cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genvecbops.dir/DependInfo.cmake --color=
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make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/CMakeFiles/vecbops.cc.dir/DependInfo.cmake --color=
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make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate && /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/genvecbops
Generating 
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cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate && /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/genvecuops
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cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate && /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/genvecwhere
Generating 
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cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/CMakeFiles/vecbfn.cc.dir/DependInfo.cmake --color=
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cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genpromote.dir/DependInfo.cmake --color=
Dependencies file "blitz/generate/CMakeFiles/genpromote.dir/genpromote.cpp.o.d" is newer than depends file "/home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genpromote.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target genpromote
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
make  -f blitz/generate/CMakeFiles/genpromote.dir/build.make blitz/generate/CMakeFiles/genpromote.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
make[2]: Nothing to be done for 'blitz/generate/CMakeFiles/genpromote.dir/build'.
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
[ 66%] Built target genpromote
make  -f blitz/CMakeFiles/promote-old.h.dir/build.make blitz/CMakeFiles/promote-old.h.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/CMakeFiles/promote-old.h.dir/DependInfo.cmake --color=
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
make  -f blitz/CMakeFiles/promote-old.h.dir/build.make blitz/CMakeFiles/promote-old.h.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate && /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/genpromote
Generating 
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
[ 66%] Built target promote-old.h
make  -f blitz/generate/CMakeFiles/genarrbops.dir/build.make blitz/generate/CMakeFiles/genarrbops.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genarrbops.dir/DependInfo.cmake --color=
Dependencies file "blitz/generate/CMakeFiles/genarrbops.dir/genarrbops.cpp.o.d" is newer than depends file "/home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genarrbops.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target genarrbops
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
make  -f blitz/generate/CMakeFiles/genarrbops.dir/build.make blitz/generate/CMakeFiles/genarrbops.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
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make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
[ 75%] Built target genarrbops
make  -f blitz/array/CMakeFiles/bops.cc.dir/build.make blitz/array/CMakeFiles/bops.cc.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/array /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array/CMakeFiles/bops.cc.dir/DependInfo.cmake --color=
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make  -f blitz/array/CMakeFiles/bops.cc.dir/build.make blitz/array/CMakeFiles/bops.cc.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate && /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/genarrbops
Generating 
780 operators written.
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
[ 75%] Built target bops.cc
make  -f blitz/generate/CMakeFiles/genarruops.dir/build.make blitz/generate/CMakeFiles/genarruops.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genarruops.dir/DependInfo.cmake --color=
Dependencies file "blitz/generate/CMakeFiles/genarruops.dir/genarruops.cpp.o.d" is newer than depends file "/home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/CMakeFiles/genarruops.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target genarruops
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make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
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make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
[ 83%] Built target genarruops
make  -f blitz/array/CMakeFiles/uops.cc.dir/build.make blitz/array/CMakeFiles/uops.cc.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/blitz/array /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/array/CMakeFiles/uops.cc.dir/DependInfo.cmake --color=
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make  -f blitz/array/CMakeFiles/uops.cc.dir/build.make blitz/array/CMakeFiles/uops.cc.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate && /home/kdm/projects/GISS/LIME/src/blitz/build/blitz/generate/genarruops
Generating 
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
[ 83%] Built target uops.cc
make  -f CMakeFiles/generated-headers.dir/build.make CMakeFiles/generated-headers.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/CMakeFiles/generated-headers.dir/DependInfo.cmake --color=
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make  -f CMakeFiles/generated-headers.dir/build.make CMakeFiles/generated-headers.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
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[ 83%] Built target generated-headers
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make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/src /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/src /home/kdm/projects/GISS/LIME/src/blitz/build/src/CMakeFiles/blitz.dir/DependInfo.cmake --color=
Dependencies file "src/CMakeFiles/blitz.dir/globals.cpp.o.d" is newer than depends file "/home/kdm/projects/GISS/LIME/src/blitz/build/src/CMakeFiles/blitz.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target blitz
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make  -f src/CMakeFiles/blitz.dir/build.make src/CMakeFiles/blitz.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
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[ 91%] Built target blitz
make  -f src/CMakeFiles/blitz-static.dir/build.make src/CMakeFiles/blitz-static.dir/depend
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
cd /home/kdm/projects/GISS/LIME/src/blitz/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/kdm/projects/GISS/LIME/src/blitz /home/kdm/projects/GISS/LIME/src/blitz/src /home/kdm/projects/GISS/LIME/src/blitz/build /home/kdm/projects/GISS/LIME/src/blitz/build/src /home/kdm/projects/GISS/LIME/src/blitz/build/src/CMakeFiles/blitz-static.dir/DependInfo.cmake --color=
Dependencies file "src/CMakeFiles/blitz-static.dir/globals.cpp.o.d" is newer than depends file "/home/kdm/projects/GISS/LIME/src/blitz/build/src/CMakeFiles/blitz-static.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target blitz-static
make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
make  -f src/CMakeFiles/blitz-static.dir/build.make src/CMakeFiles/blitz-static.dir/build
make[2]: Entering directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
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make[2]: Leaving directory '/home/kdm/projects/GISS/LIME/src/blitz/build'
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/usr/bin/cmake -E cmake_progress_start /home/kdm/projects/GISS/LIME/src/blitz/build/CMakeFiles 0
t480:~/projects/GISS/LIME/src/blitz/build [master▷] $ 

[mankoff]

ModelE COMPILE_WITH_TRAPS sets -fbounds-check -fcheck-array-temporaries -ffpe-trap=invalid,zero,overflow -fbacktrace. Should I compile Blitz with explicit -fno-... for each of those?