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Posted: **Tue May 11, 2021 6:33 pm**

Dear VASP Developers,

Recently we want to compile vasp 6.2.0 with openacc support. Since several of our GPUs are RTX A6000, which requires support of cuda11.1+. The compilation environment I'm using is PGI compilers provided by NVHPC SDK 21.2. The OpenACC I'm using comes with cuda11.2:
- nvfortran 21.2-0 LLVM 64-bit target on x86-64 Linux -tp zen

Using the makefile.include.linux_pgi_acc examples provided in the arch/ folder, the changes I made to adapt to cuda11.2 are

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FC         = mpif90 -acc -ta=tesla:cc35,cc50,cc60,cc70,cc75,cc80,cuda11.2
FCL        = mpif90 -acc -ta=tesla:cc35,cc50,cc60,cc70,cc75,cc80,cuda11.2 -pgc++libs

however compilation gives me following error (last few lines):

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!dbg attachment points at wrong subprogram for function
!7278 = distinct !DISubprogram(name: "corpbesol_", linkageName: "corpbesol_", scope: !3, file: !4, line: 6464, type: !17, isLocal: false, isDefinition: true, scopeLine: 6464, isOptimized: false, unit: !3)
void (double*, double*, double*, double*, double*, i32*)* @"ggaall_$31"
  %li2 = load i32, i32 addrspace(1)* getelementptr inbounds (%common._setexm_struct_def_21, %common._setexm_struct_def_21 addrspace(1)* @_setexm_struct_def_21, i64 0, i32 0), align 16, !dbg !18
!18 = !DILocation(line: 31, column: 1, scope: !19)
!19 = !DILexicalBlock(scope: !20, file: !4, line: 17, column: 1)
!20 = distinct !DISubprogram(name: "ggaall_", linkageName: "ggaall_", scope: !3, file: !4, line: 17, type: !17, isLocal: false, isDefinition: true, scopeLine: 17, isOptimized: false, unit: !3)
LLVM ERROR: Broken module found, compilation aborted!
NVFORTRAN-S-0155-Compiler failed to translate accelerator region (see -Minfo messages): Device compiler exited with error status code (xclib_grad.f90: 6524)
  0 inform,   0 warnings,   1 severes, 0 fatal for

On the other hand, the original makefile.include.linux_pgi_acc compiles fine with Cuda11.0. I tried to compile with separated stage (like make std; make gam; make ncl, etc) but the same error persists.

I appreciate much your help.

The complete makefile.include is as follows:

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# Precompiler options
CPP_OPTIONS= -DHOST=\"LinuxPGI\" \
             -DMPI -DMPI_BLOCK=8000 -DMPI_INPLACE -Duse_collective \
             -DscaLAPACK \
             -DCACHE_SIZE=4000 \
             -Davoidalloc \
             -Dvasp6 \
             -Duse_bse_te \
             -Dtbdyn \
             -Dqd_emulate \
             -Dfock_dblbuf \
             -D_OPENACC \
             -DUSENCCL

CPP        = pgfortran -Mpreprocess -Mfree -Mextend -E $(CPP_OPTIONS) $*$(FUFFIX)  > $*$(SUFFIX)

FC         = mpif90 -acc -gpu=cc35,cc50,cc60,cc70,cc75,cc80,cuda11.2
FCL        = mpif90 -acc -gpu=cc35,cc50,cc60,cc70,cc75,cc80,cuda11.2 -pgc++libs

FREE       = -Mfree

FFLAGS     = -Mnoupcase -Mbackslash -Mlarge_arrays

OFLAG      = -fast

DEBUG      = -Mfree -O0 -traceback

# Use PGI provided BLAS and LAPACK libraries
BLAS       = -lblas
LAPACK     = -llapack

BLACS      =
SCALAPACK  = -Mscalapack

CUDA       = -Mcudalib=cublas -Mcudalib=cufft -Mcudalib=cusolver -Mcuda

LLIBS      = $(SCALAPACK) $(LAPACK) $(BLAS) $(CUDA)

NCCL       ?= /opt/nvidia/hpc_sdk/Linux_x86_64/21.2/comm_libs/nccl/lib
LLIBS      += -L$(NCCL) -lnccl

# Software emulation of quadruple precsion
QD         ?= /opt/nvidia/hpc_sdk/Linux_x86_64/21.2/compilers/extras/qd
LLIBS      += -L$(QD)/lib -lqdmod -lqd
INCS       += -I$(QD)/include/qd

# Use the FFTs from fftw
#FFTW       ?= /opt/pgi/fftw-3.3.8
LLIBS      +=  -lfftw3
#INCS       += 

OBJECTS    = fftmpiw.o fftmpi_map.o fftw3d.o fft3dlib.o

# Redefine the standard list of O1 and O2 objects
SOURCE_O1  := pade_fit.o
SOURCE_O2  := pead.o

# Workaround a bug in PGI compiler up to and including version 18.10
#OFLAG_IN   = -fast -ta=tesla:nollvm
#OFLAG_IN   = -fast -ta=tesla:nollvm
#SOURCE_IN  := xcspin.o

# For what used to be vasp.5.lib
CPP_LIB    = $(CPP)
FC_LIB     = pgfortran
CC_LIB     = pgcc
CFLAGS_LIB = -O
FFLAGS_LIB = -O1 -Mfixed
FREE_LIB   = $(FREE)

OBJECTS_LIB= linpack_double.o getshmem.o

# For the parser library
CXX_PARS   = pgc++ --no_warnings

# Normally no need to change this
SRCDIR     = ../../src
BINDIR     = ../../bin

MPI_INC    = /opt/nvidia/hpc_sdk/Linux_x86_64/21.2/comm_libs/mpi/include

Posted: **Tue May 18, 2021 8:40 am**

Hello!

Thank you for your report, we can reproduce this behavior with the setup you described (cuda 11.2 + nvfortran 21.2). We are currently investigating this and will give further feedback when the reason and/or a solution is found. For the moment we can only comment that switching to nvfortran 21.3 seems to resolve the error during compilation at the cost of a lot of warnings (for which we also need to find an explanation).

Since you explicitly mentioned your GPU hardware, please note that these cards (RTX A6000) may not be ideal for running VASP on them. VASP relies heavily on the double precision performance which is rather limited: 38.7 vs 1.2 TFLOPS/s for single and double precision, respectively (taken from Wikipedia).

Posted: **Tue May 25, 2021 3:13 am**

Thank you for your responses! I look forward to the future work on the cuda 11.2 from the vasp team.

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