[gmx-developers] Segfault in 2021-beta1 enabling SVE and ArmIE emulator

[Guido Giuntoli]

Hi,

I have run the nonbonded-benchmark using the ArmIE emulator.

I compiled gmx_d (DOUBLE FP) with GCC 10.2 for SVE by using:

CC=gcc-10 CXX=g++-10 \
cmake .. \
        -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_C_FLAGS="-march=armv8-a+sve" \
        -DCMAKE_CXX_FLAGS="-march=armv8-a+sve" \
        -DGMX_MPI=off \
        -DGMX_GPU=off \
        -DGMX_USE_OPENCL=off \
        -DGMX_BUILD_MDRUN_ONLY=off \
        -DGMX_DOUBLE=on \
        -DGMX_SIMD=ARM_SVE \
        -DBUILD_SHARED_LIBS=off \
        -DGMX_FFT_LIBRARY=fftw3 \
        -DGMX_INSTALL_NBLIB_API=OFF \
        -DGMXAPI=OFF \
        | tee cmake.log

I ran the benchmark with:

armie -msve-vector-bits=256 \
        gmx_d nonbonded-benchmark \
        -size 1 \
        -nt 1 \
        -simd 4xm \
        -coulomb ewald \
        -notable \
        -combrule geometric \
        -nohalflj \
        -noenergy \
        -noall \
        -cutoff 1 \
        -iter 5 \
        -warmup 0 \
        -nocycles

I get:

armie's SVESigHandler caught signal SIGSEGV from the process being emulated, passing it to the default signal handler.
Guest process terminated by signal: 15152 Segmentation fault /home/... /codes/gromacs/gromacs-2021-beta1/build-sve/bin/gmx_d

According to the last meeting, I am eager to know if this branch has passed the regression tests using SVE. BTW, are you using SVE-enabled hardware or emulation for your development/tests?

Best regards | Mit freundlichen Grüßen

Guido Giuntoli

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