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  3. Trying to run the CFX or Fluent solver on AMD EPYC 7551 you receive similar errors as shown below /ansys_inc/v194/CFX/bin/linux-amd64/ifort/solver-mpi.exe’: free(): invalid next size (fast): 0x0000000003f9ac70 *** ======= Backtrace: ========= /lib64/libc.so.6(+0x81679)[0x2ad96474d679] /ansys_inc/v194/CFX/tools/multiport/utilities/lnamd64/libcputopo.so(cpu_topology+0x1001)[0x2ad9a0850d05] /ansys_inc/v194/CFX/bin/linux-amd64/ifort/solver-mpi.exe(getsystopol_+0xb6)[0x1a00836]

Trying to run the CFX or Fluent solver on AMD EPYC 7551 you receive similar errors as shown below /ansys_inc/v194/CFX/bin/linux-amd64/ifort/solver-mpi.exe’: free(): invalid next size (fast): 0x0000000003f9ac70 *** ======= Backtrace: ========= /lib64/libc.so.6(+0x81679)[0x2ad96474d679] /ansys_inc/v194/CFX/tools/multiport/utilities/lnamd64/libcputopo.so(cpu_topology+0x1001)[0x2ad9a0850d05] /ansys_inc/v194/CFX/bin/linux-amd64/ifort/solver-mpi.exe(getsystopol_+0xb6)[0x1a00836]

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    • March 17, 2023 at 9:01 am
      FAQFAQ
      Participant

      This problem is caused by the hardware topology probing in multiport. This is a known defect and has been fixed in the upcoming Ansys release 20.1 due out in January/February 2020. For CFX it would be possible to work around this problem by disabling hardware topology probing as follows: Create a file (e.g. named aff_diag_disable.ccl – the name isn’t important) containing: FLOW: EXPERT PARAMETERS: process affinity diagnostics option = 0 END END If running from the command line, this file can be specified on the cfx5solve command line together with the usual options (e.g. -ccl aff_diag_disable.ccl). If running from the CFX solver manager it may be possible to specify this by selecting ‘Advanced Controls’ and specifying those extra options in ‘Solver Arguments’ on the ‘Solver’ tab. For Fluent just use this flag in the command line: -affinity=0 to disable processor affinity.

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