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LSTC and LS-DYNA● LSTC was founded in 1987 by John O. Hallquist to
commercialize as LS-DYNA the public domain code that originated as DYNA3D. DYNA3D was developed at the Lawrence Livermore National Laboratory, by LSTC’s founder, John O. Hallquist.
● LS-DYNA is a general-purpose finite element program capable of simulating complex real world problems. It is used by the automobile, aerospace, construction, military, manufacturing, and bioengineering industries.
● Supports many hardware platform and OSes.
Processor Operating SystemAMD Opteron, EPYC LinuxCRAY XD1 LinuxHP PA-8X00 HP-UX 11.11 and aboveHP IA-64 HP-UX 11.22 and aboveHP Opteron Linux CP4000/XCIBM Power 4/5 and 8 Linux, AIXINTEL IA64 LinuxINTEL Xeon Linux
Windows 64 bitNEC SX6 Super-UXSGI Mips IRIX 6.5 XSGI IA64 SUSE 9 w/Propack 4
RedHat w/Propack 3SUN Sparc 5.8 and aboveSUN x86-64 5.8 and above
Issues encountered
● Some preprocessor macros that are not strictly spec-compliant have to be corrected to be acceptable to armclang
● OpenMPI 3.1.x vader bug coincided with our initial effort and created some headache. Not as performant as Platform MPI or Intel MPI.
● Intel compilers are more permissive● Code has been tuned for years targeting intel’s
platform
Testing machine #1
● Thread(s) per core: 4● Core(s) per socket: 28● Socket(s): 2● -O3 -fstack-arrays● -mcpu=native
Testing machine #1: preliminary numbers
MPI Ranks w/o OpenMP w/ OpenMP (4 cpus per rank)
2 7887 5690
4 3876 2870
8 3520 (?) 1549
16 1935 891
32 1070 524
● -Ofast on par with -O3
Testing machine #2
● Thread(s) per core: 1● Core(s) per socket: 16● Socket(s): 4● -O3 -fstack-arrays● -mcpu=native
Testing machine #2: preliminary numbers
MPI Ranks w/o OpenMP w/ OpenMP (4 cpus per rank)
4 2477 1492
8 1409 819
16 987 505
32 567 N/A
64 364 N/A
Some thoughts on porting to ARM
● More cores & more threads● Great memory bandwidth● Socket vs. socket● TOC comparison