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  3. Running MAPDL 2021 R1 (or prior releases) distributed solving on newer version Linux (such as SLES 15.X, RHEL 8.X) with default Intel MPI 2018.3 may get below error: forrtl: severe (174): SIGSEGV, segmentation fault occurred Image PC Routine Line Source libifcoremt.so.5 00007F4D6B351522 for__signal_handl Unknown Unknown libpthread-2.26.s 00007F4D3861E2D0 Unknown Unknown Unknown libc-2.26.so 00007F4D35EA27A2 strtok_r Unknown Unknown libmpi.so.12.0 00007F4D34E9B591 __I_MPI___intel_s Unknown Unknown libmpi.so.12.0 00007F4D34D5D8F5 Unknown Unknown Unknown libmpi.so.12.0 00007F4D34D606…

Running MAPDL 2021 R1 (or prior releases) distributed solving on newer version Linux (such as SLES 15.X, RHEL 8.X) with default Intel MPI 2018.3 may get below error: forrtl: severe (174): SIGSEGV, segmentation fault occurred Image PC Routine Line Source libifcoremt.so.5 00007F4D6B351522 for__signal_handl Unknown Unknown libpthread-2.26.s 00007F4D3861E2D0 Unknown Unknown Unknown libc-2.26.so 00007F4D35EA27A2 strtok_r Unknown Unknown libmpi.so.12.0 00007F4D34E9B591 __I_MPI___intel_s Unknown Unknown libmpi.so.12.0 00007F4D34D5D8F5 Unknown Unknown Unknown libmpi.so.12.0 00007F4D34D606…

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    • March 17, 2023 at 1:11 pm
      SolutionSolution
      Participant

      Attempting to use legacy versions of Intel® MPI Library on newer operating systems will lead to segmentation faults. The segfault is due to an incompatibility in glibc. Option #1: Create a file strtok_proxy.c with attached code. Compile this file using the following commands: gcc -c -Wall -Werror -fpic ./strtok_proxy.c gcc -ldl -shared -o ./strtok_proxy.so ./strtok_proxy.o And apply the generated library at runtime using the following: export LD_PRELOAD=./strtok_proxy.so Option #2: Try Intel MPI 2019.8 included in 2021 R1 installation, backup and edit {installed_path}/v211/ansys/bin/anssh.ini file. 1.Uncomment line # 1880 from: ##ANS_TEMP=”${ANS_TEMP}:${ANSYSCOMMON_DIR}/MPI/Intel/${intel_mpi_version}/${ANSYS_SYSDIR}/bin/legacy” To: ANS_TEMP=”${ANS_TEMP}:${ANSYSCOMMON_DIR}/MPI/Intel/${intel_mpi_version}/${ANSYS_SYSDIR}/bin/legacy” 2.Uncomment line #1889 and #1890 from: ##setenv I_MPI_VAR_CHECK_SPELLING “0” ##setenv FI_PROVIDER_PATH “${I_MPI_ROOT}/libfabric/lib/prov” To: setenv I_MPI_VAR_CHECK_SPELLING “0” setenv FI_PROVIDER_PATH “${I_MPI_ROOT}/libfabric/lib/prov” 3.Uncomment line # 1952 from: ##ANS_TEMP=”${ANS_TEMP}:${ANSYSCOMMON_DIR}/MPI/Intel/${intel_mpi_version}/${ANSYS_SYSDIR}/libfabric/lib” To: ANS_TEMP=”${ANS_TEMP}:${ANSYSCOMMON_DIR}/MPI/Intel/${intel_mpi_version}/${ANSYS_SYSDIR}/libfabric/lib” 4.Change line # 2207 from: setenv intel_mpi_version “2018.3.222” to 2019.8.254: setenv intel_mpi_version “2019.8.254” 5.Comment out lines # 2242-2244 from: if [ -z “${I_MPI_DYNAMIC_CONNECTION}” ]; then setenv I_MPI_DYNAMIC_CONNECTION “no” fi To ## if [ -z “${I_MPI_DYNAMIC_CONNECTION}” ]; then ## setenv I_MPI_DYNAMIC_CONNECTION “no” ## fi

      Attachments:
      1. 2064809.zip

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