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

[Guido Giuntoli]

Hi Gilles,

Thanks a lot, I tested again and it is working with ArmIE for a length of 512. I will close the Issue in GitLab.

SVE allows to set the vector length at run time, is there a particular reason for doing this at compile time?

Cheers, Guido. 

-----Original Message-----
From: gromacs.org_gmx-developers-bounces at maillist.sys.kth.se [mailto:gromacs.org_gmx-developers-bounces at maillist.sys.kth.se] On Behalf Of Gilles Gouaillardet
Sent: Tuesday, October 27, 2020 10:05 AM
To: gmx-developers at gromacs.org
Subject: Re: [gmx-developers] Segfault in 2021-beta1 enabling SVE and ArmIE emulator

Guido,


The SVE vector length must be fixed at cmake time, and the default value is 512.

In your case, you have to pass

-DGMX_SIMD_ARM_SVE_LENGTH=256

to your cmake command line.


Cheers,


Gilles

On 10/27/2020 5:58 PM, Guido Giuntoli wrote:
>
> 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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